Geomechanics for Energy and the Environment最新文献_第5页

Thermomechanical analysis method for energy piles with skin friction softening and hardening behavior 具有皮摩软化硬化特性的能源桩热力学分析方法

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-09-17 DOI: 10.1016/j.gete.2025.100744

Huaibo Song , Huafu Pei , Hao Wang

Various approaches have been proposed to analyze the thermomechanical behavior of individual energy piles. Although these approaches can account for pile-soil interactions, there is a lack of approaches for continuously describing the full nonlinear range of the load-transfer curve for individual energy piles under thermomechanical loading, including both skin friction softening and the hardening behavior. Therefore, this study developed an analysis method for individual energy piles by considering skin friction softening and hardening behaviors. The developed approach was verified by comparing the simulation results with those of three well-documented field tests, alongside laboratory and centrifuge model tests. The simulation results show a maximum percentage error between the simulation results and the field measurement results is 8.8 %, which is much smaller than that of other methods, indicating a relatively high degree of consistency between the simulation and the actual situation. Besides，the results suggest that the proposed method can capture the full nonlinear range of the load-transfer curve and essential aspects of the pile in terms of the stress and displacement induced by the thermomechanical operation. Finally, a parametric analysis was conducted to study the effects of the model parameters on the energy pile thermomechanical performance. Results show that increasing the dimensionless parameter changes the pile axial thermal stress and displacement oppositely; increasing the residual ratio boosts axial thermal stress, reduces displacements and stress, and moves the neutral point (NP) towards the pile head.

人们提出了各种方法来分析单个能量桩的热力学行为。虽然这些方法可以解释桩-土相互作用，但缺乏连续描述单个能量桩在热力载荷作用下的荷载传递曲线的全部非线性范围的方法，包括皮摩擦软化和硬化行为。因此，本研究提出了考虑皮摩软化和硬化行为的单个能源桩分析方法。通过将模拟结果与三次有充分记录的现场试验以及实验室和离心机模型试验的结果进行比较，验证了所制定的方法。模拟结果表明，模拟结果与现场测量结果的最大误差百分比为8.8 %，远小于其他方法的误差百分比，表明模拟结果与实际情况的一致性较高。研究结果表明，该方法可以捕捉到荷载传递曲线的全部非线性范围，以及热力学作用引起的应力和位移的本质方面。最后，通过参数分析研究了模型参数对能量桩热力学性能的影响。结果表明：增大无量纲参数对桩的轴向热应力和位移产生相反的影响；增加残余比增大轴向热应力，减小位移和应力，使中性点向桩顶移动。

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引用次数: 0

Molecular insights into the shear behavior of interstratified illite-smectite clays: Effects of hydration and illitization 层间伊利石-蒙脱石粘土剪切行为的分子洞察：水化和伊利化的影响

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-11-06 DOI: 10.1016/j.gete.2025.100759

Wenbo Niu , Chaofa Zhao , Hamza Mhamdi Alaoui , Zhongxuan Yang , Pierre-Yves Hicher

Clayey geomaterials rarely occur in a pure mineralogical state in nature and are more commonly found as mixed-layer clays, such as interstratified illite-smectite. These clays consist of varying proportions of illite and smectite layers, which significantly affect their mechanical properties. Under variable mechanical conditions, the shear behavior of mixed-layer clays exhibits considerable complexity, underscoring the need for in-depth investigations. This paper presents a molecular-scale study on the behavior of interstratified illite-smectite minerals, simulating a geotechnical shear setup at the molecular level. Multiple molecular models were constructed to explore the effects of water content and illite layer proportions, effectively replicating stages of the illitization process. The results reveal that the mixed-layer clays exhibit clear stick–slip behavior during shear simulation. Models with low illite content demonstrated relatively similar shear characteristics, while higher illite content led to a significant reduction in nanoscale cohesion and a slight increase in friction coefficient. Pure illite exhibited the highest shear strength among the studied materials, with a friction coefficient and cohesion of 0.111 and 0.172 GPa, respectively. Furthermore, the illitization process was observed to progressively enhance the shear modulus, ranging from 0.63 GPa to 26.81 GPa under various hydrostatic pressures. A statistical analysis was also performed to further examine the stick–slip behavior of mixed-layer clays. These findings provide essential insights into the nanoscale mechanical properties of mixed-layer clay minerals, contributing to a deeper understanding of geomaterial stability in critical applications.

粘土土工材料在自然界中很少以纯矿物学状态出现，更常见的是混合层状粘土，如层间伊利石-蒙脱石。这些粘土由不同比例的伊利石和蒙脱石层组成，这显著影响了它们的力学性能。在不同的力学条件下，混合层粘土的剪切行为表现出相当的复杂性，强调了深入研究的必要性。本文在分子水平上模拟岩土剪切装置，对层间伊利石-蒙脱石矿物的行为进行了分子尺度的研究。构建了多个分子模型来探索含水量和伊利石层比例的影响，有效地复制了伊利石化过程的各个阶段。结果表明，混合层粘土在剪切模拟过程中表现出明显的粘滑特性。低伊利石含量的模型剪切特性相对相似，而高伊利石含量导致纳米尺度黏聚力显著降低，摩擦系数略有增加。纯伊利石的抗剪强度最高，摩擦系数和黏聚力分别为0.111和0.172 GPa。此外，在不同的静水压力下，钝化过程逐渐提高了剪切模量，从0.63 GPa到26.81 GPa不等。为了进一步研究混合层粘土的粘滑特性，还进行了统计分析。这些发现为混合层粘土矿物的纳米级力学特性提供了重要的见解，有助于更深入地了解关键应用中的地质材料稳定性。

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引用次数: 0

A three-dimensional fractional elastoplastic constitutive model for rocks within ductile domain 岩石塑性域三维分形弹塑性本构模型

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-09-02 DOI: 10.1016/j.gete.2025.100736

Jiacun Liu , Junjie Xiao , Ying Xu , Xing Li , Kaiwen Xia , Gang Han

Under the influence of high three-dimensional geostress, rocks transition into the ductile domain, undergoing continuous plastic hardening and volumetric contraction. Accurately describing the three-dimensional anisotropic deformation of rocks within ductile domain is of great significance for deep underground engineering. Therefore, a three-dimensional fractional elastoplastic constitutive within ductile domain is proposed in this study, including yield function and fractional flow rule. The ductile yield function is based on the modified Mohr-Coulomb criterion and generalized Matsuoka-Nakai deviatoric function. The deviatoric stress of yield surface is negatively correlated to hydrostatic pressure, but positively correlated to Lode angle. The yield surfaces in both meridian and deviatoric planes evolve with the plastic internal variable, accurately capturing the stress state during hardening. Two different fractional orders are used to control the plastic flow direction within meridian and deviatoric planes, represented by dilation angle and plastic deflection angle, respectively. These fractional orders are determined based on the relationship between plastic shear strain and volumetric strain, and they vary with the plastic internal variable, effectively capturing the plastic flow direction throughout hardening. The proposed model is validated using green sandstone data from hydrostatic compression and true-triaxial tests. The effect of fractional orders on the dilation angle and plastic deflection angle is discussed. Under the influence of fractional orders, both dilation angle and plastic deflection angle range from

0^{\circ}

to

- 90^{\circ}

. Besides, a comparison between the non-orthogonality and orthogonality flow rules is made. These results indicate that the fractional flow rule significantly improves the applicability and accuracy of constitutive model.

在高三维地应力作用下，岩石过渡到韧性域，经历连续的塑性硬化和体积收缩。准确描述岩石在韧性域内的三维各向异性变形对深部地下工程具有重要意义。因此，本研究提出了包含屈服函数和分数流动规则的塑性域三维分数弹塑性本构。塑性屈服函数基于修正的Mohr-Coulomb准则和广义的Matsuoka-Nakai偏差函数。屈服面偏应力与静水压力呈负相关，与Lode角呈正相关。子午面和偏面屈服面随塑性内变量的变化而变化，准确地捕捉了硬化过程中的应力状态。用两个不同的分数阶来控制子午面和偏面内的塑性流动方向，分别用膨胀角和塑性挠度角表示。这些分数阶是根据塑性剪切应变和体积应变之间的关系确定的，它们随着塑性内部变量的变化而变化，有效地捕捉了整个硬化过程中的塑性流动方向。利用静水压缩和真三轴试验的绿砂岩数据验证了所提出的模型。讨论了分数阶对膨胀角和塑性挠曲角的影响。在分数阶的影响下，膨胀角和塑性挠度的范围从0°到−90°。此外，还对非正交和正交流动规律进行了比较。这些结果表明，分数流动规则显著提高了本构模型的适用性和准确性。

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引用次数: 0

Progressive failure of coal–rock under triaxial disturbance: From experimental and crack propagation modeling perspectives 煤岩在三轴扰动下的渐进破坏：从实验和裂纹扩展模型的角度

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-10-04 DOI: 10.1016/j.gete.2025.100753

Yiqing Zhao , Wenjing Qin , Jinbo Liu , Aibing Jin , Shuaijun Chen

During deep mining, coal–rock masses are prone to dynamic stress redistribution and concentration under triaxial unloading disturbances, leading to progressive crack evolution and eventual instability. To investigate the underlying failure mechanism, triaxial unloading disturbance tests were carried out. Acoustic emission (AE) monitoring was used to track key indicators, including the RA/AF ratio, b-value, and dominant frequency. In addition, multifractal spectrum analysis was introduced to systematically characterize the crack evolution process of coal–rock under different unloading rates of confining pressure. The study divides the failure process into four stages and proposes an axial crack propagation model based on fracture mechanics to describe crack evolution under disturbed unloading conditions. The results indicate that, with increasing unloading rates, coal–rock failure is dominated by shear failure, accompanied by a reduction in the number of macroscopic cracks. The acoustic emission (AE) signals exhibit stronger multifractal characteristics and localized intensity heterogeneity, reflecting increased internal structural complexity and disorder. The developed crack propagation model provides theoretical support for the study of fracture evolution in geological materials under unconventional loading conditions and offers guidance for crack prediction and failure assessment in complex stress environments.

在深部开采过程中，煤岩体在三轴卸荷扰动下容易发生动应力重分布和集中，导致裂隙逐步演化，最终失稳。为了研究其潜在的破坏机制，进行了三轴卸荷扰动试验。采用声发射（AE）监测，对RA/AF比、b值、主导频率等关键指标进行跟踪。此外，引入多重分形谱分析，系统表征了煤岩在不同围压卸载速率下的裂纹演化过程。研究将破坏过程分为4个阶段，提出了基于断裂力学的轴向裂纹扩展模型来描述扰动卸载条件下的裂纹演化。结果表明：随着卸荷速率的增加，煤岩破坏以剪切破坏为主，宏观裂缝数量减少；声发射信号表现出更强的多重分形特征和局部强度非均质性，反映了内部结构复杂性和无序性的增加。所建立的裂缝扩展模型为非常规载荷条件下地质材料裂缝演化研究提供了理论支持，为复杂应力环境下裂缝预测和破坏评价提供了指导。

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引用次数: 0

Influence of natural fracture zones on hydraulic fracture propagation and proppant transport in tight sandstone reservoirs 天然裂缝带对致密砂岩储层水力裂缝扩展及支撑剂运移的影响

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI: 10.1016/j.gete.2025.100763

Shuwen Hou , Zhaozhong Yang , Liangping Yi , Dongrui Fu , Xiaogang Li , Jianping Liu , Duo Yi

Horizontal well segmented multicluster fracturing technology is key for transforming unconventional reservoirs. A multicluster hydraulic fracture propagation and proppant transport model is established that incorporates the influence of natural fracture zones and is based on the discrete element method (DEM). It defines quantitative parameters to depict fracture propagation and proppant placement effectiveness. This study reveals the influence of various factors on reservoir stimulation effectiveness and employs impact assessment to compare the relative importance of each factor. The results indicate that wider natural fracture zones (NFZs) and smaller angles between the NFZ and hydraulic fracture propagation direction increase the difficulty for hydraulic fractures to breach the NFZ barrier and continue propagating. This results in more activated discrete natural fractures, greater fluid diversion, greater nonuniform hydraulic fracture propagation, an increased risk of limited fracture growth, and an increased probability of interwell interference. A higher fracturing flow rate and fracturing fluid viscosity result in less interfracture stress interference and greater uniformity of multifracture propagation in a less complex fracture network. Larger proppant particles increase the risk of proppant plugging. Blockages are prone to occur in narrow fracture sections, hindering the continuous injection of fracturing fluid. Staged pumping can prevent proppant accumulation at the fracture tip and prevent inadequate near-wellbore proppant placement caused by pump shutdown. The particle size, angle of the natural fracture zone relative to the hydraulic fracture propagation path, and fracturing flow rate most significantly impact the reservoir stimulation effectiveness of reservoirs containing natural fractures.

水平井分段式多簇压裂技术是非常规油藏改造的关键技术。基于离散元法（DEM），建立了考虑天然裂缝带影响的多簇水力裂缝扩展和支撑剂运移模型。它定义了定量参数来描述裂缝扩展和支撑剂放置效果。本研究揭示了各种因素对储层增产效果的影响，并采用影响评价方法对各因素的相对重要性进行了比较。结果表明，天然裂缝带越宽，裂缝与水力裂缝扩展方向夹角越小，增加了水力裂缝突破天然裂缝带屏障并继续扩展的难度。这导致了更多的离散天然裂缝被激活，更大的流体分流，更大的不均匀水力裂缝扩展，增加了裂缝有限增长的风险，增加了井间干扰的可能性。压裂流量和压裂液粘度越高，裂缝间应力干扰越小，裂缝网络越不复杂，多条裂缝扩展越均匀。较大的支撑剂颗粒会增加支撑剂堵塞的风险。在狭窄的裂缝段容易发生堵塞，阻碍压裂液的连续注入。分级泵送可以防止支撑剂在裂缝尖端积聚，防止泵关井导致近井支撑剂放置不足。颗粒尺寸、天然裂缝带相对水力裂缝扩展路径的角度、压裂流量对含天然裂缝储层增产效果的影响最为显著。

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引用次数: 0

Damage simulation of casing-cement interface of wellbore structure under non-uniform formation stress 非均匀地层应力下井筒结构套管-水泥界面损伤模拟

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-09-18 DOI: 10.1016/j.gete.2025.100747

Fei Li , Yongsheng Liu , Haoran Xu , Feng Tang , Lihong Han , Shangyu Yang

In ultra-deep drilling operations, formations such as creeping mudstone and high-pressure salt layers are frequently encountered, generating non-uniform loads that pose severe challenges to casing design and wellbore integrity. The interfacial bonding behavior between the cement sheath and casing is a critical factor governing the long-term integrity of the wellbore. This paper develops a damage model for the double-layer casing-cement sheath interface under non-uniform loading based on peridynamic theory. The model numerically characterizes the evolution mechanism of interface damage under non-uniform stress. Laboratory tests were conducted using a Digital Image Correlation (DIC) system to capture the strain evolution on the casing-cement sheath surface during radial compression. The results indicate that the peridynamic simulation of damage at the double-layer casing-cement sheath interface under non-uniform loading is in strong agreement with the DIC strain measurements. From the perspective of strain accumulation and damage morphology, increasing the outer casing radius enhances the overall structural stiffness. Strain accumulation at the inner casing-cement interface accelerates, with damage concentrated at the interface. while damage within the cement sheath primarily propagates along the 90° and 270° loading directions. In contrast, an increase radius of the inner casing reduces the constraint on the cement sheath, making the casing more prone to “ovalization” deformation. This extension of the stress transfer path slows strain accumulation at the inner casing–cement interface, with damage propagating along the 0°, 90°, 180°, and 270° directions. Experimental results further indicate that the load-bearing capacity of the model with an inner casing is at least 2.5 times higher than that of the model without an inner casing. The study reveals the mechanical mechanism governing the sealing capacity of the cement sheath in double-layer casings, providing significant theoretical and engineering implications for ensuring wellbore integrity and stability in oil and gas operations.

在超深钻井作业中，经常会遇到蠕变泥岩和高压盐层等地层，这些地层会产生不均匀载荷，对套管设计和井筒完整性构成严重挑战。水泥环与套管之间的界面粘合行为是决定井筒长期完整性的关键因素。基于周动力理论，建立了非均匀载荷作用下双层套管-水泥环界面损伤模型。该模型对非均匀应力作用下界面损伤的演化机制进行了数值表征。使用数字图像相关（DIC）系统进行了实验室测试，以捕获径向压缩过程中套管-水泥环表面的应变演变。结果表明，非均匀载荷作用下双层套管-水泥环界面损伤的周动力模拟结果与DIC应变测量结果吻合较好。从应变积累和损伤形态的角度来看，增大外套管半径可以提高整体结构刚度。内套管-水泥界面应变积累加速，损伤集中在界面处。而水泥环内的损伤主要沿90°和270°加载方向传播。相反，内套管半径的增加减少了对水泥环的约束，使套管更容易发生“卵化”变形。这种应力传递路径的延伸减缓了内套管-水泥界面的应变积累，损伤沿0°、90°、180°和270°方向传播。实验结果进一步表明，加内壳模型的承载能力比不加内壳模型的承载能力至少提高2.5倍。该研究揭示了双层套管中控制水泥环密封能力的机械机制，为确保油气作业中的井筒完整性和稳定性提供了重要的理论和工程意义。

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引用次数: 0

Investigation on mechanical response and fracture behavior of initially damaged shale based on multi-level PB-GBM method 基于多级PB-GBM方法的初始损伤页岩力学响应及破裂行为研究

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-09-08 DOI: 10.1016/j.gete.2025.100738

Jianping Zuo , Bo Lei , Genshui Wu , Haiyan Liu , Massimo Coli

Research on the failure behavior of Longmaxi shale is vital for shale reservoir reconstruction. Shale inherently contains some initial micro-cracks, which significantly affect its strength and failure behavior. In this paper, a refined boundary multi-level parallel bonded grain-based model (multi-level PB-GBM) in Particle Flow Code (PFC2D) was developed, and the effect of inherent initial damage on shale strength and failure behavior was quantitatively investigated. The results showed that inherent initial damage significantly influences the failure pattern and mechanical properties of shale. The newly generated cracks of the initially damaged samples are significantly self-organized compared with those of the undamaged samples, indicating that the inherent initial damaged cracks induce the orientation and aggregation of micro-cracks. High initially damaged samples mainly demonstrate by splitting-shear coupled fracture as a result of the co-evolution of primary and secondary micro-cracks. Generally, rock strength gradually decreases as the initial damage increases. When the inherent initial damage within the sample is low, the rock strength is greatly influenced by confining pressure, whereas when the initial damage is high enough, the initial damage contributes more to the rock strength.

研究龙马溪页岩破坏行为对页岩储层改造具有重要意义。页岩固有的初始微裂缝对其强度和破坏行为有重要影响。本文建立了颗粒流规范（PFC2D）中基于颗粒的精细边界多级平行粘结模型（多级PB-GBM），定量研究了固有初始损伤对页岩强度和破坏行为的影响。结果表明，固有初始损伤对页岩的破坏模式和力学性能有显著影响。与未损伤试样相比，初始损伤试样新生成的裂纹具有明显的自组织特征，表明固有的初始损伤裂纹诱导了微裂纹的取向和聚集。高初始损伤试样主要表现为初生微裂纹与次生微裂纹共同演化导致的劈裂-剪切耦合断裂。一般情况下，随着初始损伤的增加，岩石强度逐渐降低。当试样内部固有初始损伤较小时，围压对岩石强度的影响较大；当初始损伤足够大时，初始损伤对岩石强度的贡献较大。

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引用次数: 0

Quantitative prediction of tertiary formation fractures and its application in lost circulation prediction in the Bozhong Depression 渤中坳陷第三系裂缝定量预测及其在漏失预测中的应用

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-09-24 DOI: 10.1016/j.gete.2025.100749

He Du , Jianwei Feng , Shouyu Xu , Junxiao Qu , Chen Li , Xiang Gao , Huilin Xing

In recent years, the exploration and development of oil and gas reservoirs in the Bohai Sea have gained significant attention. However, the high cost of offshore drilling and the occurrence of frequent lost circulation accidents have resulted in substantial economic losses. Therefore, it is crucial to effectively predict and assess the risk of lost circulation in the Bozhong Depression. This study focuses on the analysis of lost circulation characteristics, identifying fracture characteristics as the most influential factors. Geomechanical methods were employed to characterize fracture parameters in the study area, enabling the prediction of lost circulation. A three-dimensional heterogeneous rock mechanical parameter model, incorporating lithology and faults, was constructed based on rock mechanics experiments, logging, and seismic data. Structural evolution analysis and acoustic emission experiments were conducted to determine the main period of fracture development. The Ansys software's finite element simulation platform facilitated the simulation of the paleo-stress field in the study area. By applying the principles of geomechanics, a calculation formula for fracture parameters was derived, and the spatial distribution of fracture parameters in the study area was quantitatively characterized using the results of the paleo-stress field simulation. Taking into account the lost circulation points of drilled wells, fracture parameters, current stress field, lithology, and other factors contributing to lost circulation, a leakage risk threshold area for fracture parameters was proposed. The predictions of lost circulation were validated using verification wells, demonstrating good agreement with actual drilling conditions. This approach provides valuable insights for mitigating lost circulation during drilling, reducing drilling cycles, and minimizing economic losses.

近年来，渤海地区的油气勘探与开发备受关注。然而，海上钻井成本高，漏失事故频发，造成了巨大的经济损失。因此，有效地预测和评估渤中坳陷的漏失风险至关重要。本研究重点分析了漏失特征，认为裂缝特征是影响漏失最主要的因素。利用地质力学方法对研究区域的裂缝参数进行表征，从而预测井漏情况。基于岩石力学实验、测井和地震资料，建立了考虑岩性和断层的三维非均质岩石力学参数模型。通过构造演化分析和声发射实验确定了裂缝发育的主要时期。利用Ansys软件的有限元仿真平台，实现了研究区古应力场的模拟。应用地质力学原理，推导了裂缝参数计算公式，并利用古应力场模拟结果定量表征了研究区裂缝参数的空间分布。综合考虑井漏点、裂缝参数、当前应力场、岩性等导致漏失的因素，提出了裂缝参数的泄漏风险阈值区域。利用验证井对漏失预测进行了验证，与实际钻井条件吻合良好。该方法为减少钻井过程中的漏失、缩短钻井周期、最大限度地减少经济损失提供了宝贵的见解。

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引用次数: 0

Research on rock failure characteristics under combined action of uniaxial stress and explosion 单轴应力与爆炸共同作用下岩石破坏特性研究

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-10-08 DOI: 10.1016/j.gete.2025.100755

Zhibiao Guo , Jingwei Gao , Junao Zhu

Blasting technology is widely used in deep rock mass engineering, and the surrounding rock damage and crack propagation caused by blasting are usually affected by ground stress. The failure and propagation of cracks in boreholes surrounding rock under the combined action of uniaxial stress and blasting load are comprehensively studied. Explosion tests, mechanical analysis, and finite element modeling are used to verify these results from the perspectives of numerical simulation and field engineering. The LS-DYNA numerical software is used to verify the explosion experiment, and the corrected constitutive model is used to simulate the effects of different uniaxial stresses on rock loosening and shaped charge blasting failure characteristics. The fracture network is processed by ImageJ software, and the fracture morphology and fractal characteristics of rock surface are analyzed. Then, the change of fracture mode of uniaxial stress-induced shaped charge blasting is analyzed by means of elastic mechanics, and the mechanism of directional crack propagation is discussed. The results show that the crack initiation occurs along the zone of maximum tensile stress around the hole during loosening blasting. The application of uniaxial stress can restrain the speed and length of crack growth and control the direction of radial crack growth, which makes the crack propagation parallel to the stress direction more advantageous. In the process of shaped charge blasting, with the increase of uniaxial stress, the damage in the shaped charge direction gradually forms a complete failure plane, which significantly inhibits the crack growth in the non-shaped charge direction. This leads to fewer cracks, but faster spreads, and fewer fractal dimensions of cracks and rock damage. Finally, the test of cutting the top and relieving pressure of coalmine by shaped charge blasting has been carried out, and satisfactory results have been obtained. In deep rock mass engineering, it is suggested to use shaped charge blasting under anisotropic ground stress to achieve directional blasting so as to better maintain the integrity of surrounding rock and obtain a smoother blasting surface.

爆破技术在深部岩体工程中应用广泛，爆破引起的围岩破坏和裂纹扩展通常受到地应力的影响。全面研究了单轴应力和爆破荷载共同作用下钻孔围岩裂纹的破坏和扩展规律。从数值模拟和现场工程的角度，利用爆炸试验、力学分析和有限元建模来验证这些结果。利用LS-DYNA数值软件对爆炸实验进行验证，并利用修正后的本构模型模拟不同单轴应力对岩石松动及聚能爆破破坏特性的影响。利用ImageJ软件对裂缝网络进行处理，分析岩石表面裂缝形态和分形特征。然后，利用弹性力学分析了单轴应力诱导聚能爆破破裂模式的变化，探讨了定向裂纹扩展的机理。结果表明：在松动爆破过程中，裂纹沿孔周围最大拉应力区萌生；施加单轴应力可以抑制裂纹扩展的速度和长度，控制径向裂纹扩展的方向，使裂纹平行于应力方向扩展更为有利。在聚能爆破过程中，随着单轴应力的增大，聚能方向的损伤逐渐形成完整的破坏面，显著抑制了非聚能方向的裂纹扩展。这导致裂缝减少，但扩展速度加快，裂缝和岩石损伤的分形维数减少。最后进行了聚能爆破切顶卸压试验，取得了满意的效果。在深部岩体工程中，建议采用各向异性地应力作用下的聚能爆破实现定向爆破，以更好地保持围岩的完整性，获得更光滑的爆破面。

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引用次数: 0

Comparative tests on the failure characteristics and mechanisms of soft inclined foundation waste dump under gravity 重力作用下软倾斜地基排土场破坏特征及机理对比试验

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2025-12-01 Epub Date: 2025-09-18 DOI: 10.1016/j.gete.2025.100746

Qiang Wen , Shuwei Sun , Jiachen Zhang , Yuan Li , Hui Ding

Landslide disasters occur frequently on the slopes of open-pit mine waste dumps, thus the study of their failure mechanism is crucial to mine environmental protection and safe production. This study conducted three sets of base friction model tests on waste dumps with different inclination angles. Based on an updated speckle analysis and point-tracking technology, the failure process of the waste dump slopes was obtained, focusing on analyzing the occurrence mechanism, failure mode, and stability of the slopes. The findings indicated that the waste dump slopes of inclined foundations have prominent progressive failure characteristics, and due to the influence of the inclined foundation, the waste dump slope failure mode is significantly different. According to the movement characteristics of the slopes in the tests, the deformation process of slopes was categorized into three phases: the uniform deformation phase, the local failure phase, and the overall instability phase. Taking the characteristic moment of the model entering into local failure and overall instability as the stability evaluation index, which showed that anti-inclined foundation slopes had the best stability, followed by horizontal, with down-inclined slopes being the least stable, which is basically consistent with other results. The sliding surface geometry and factor of safety of the slopes were obtained by using the strength reduction method in the FLAC3D software. The deformation characteristics of waste dump slopes with soft inclined foundations derived from numerical modeling are in basic accordance with previous base friction model test results. The study also noted that as the inclination angle of the basement changes, the sliding surface of different types of foundation waste dumps gradually changes from polyline to arc-shaped. These findings could offer qualitative insights into assessing the stability of waste dump slopes on soft inclined foundations, which are of great significance to mine environmental protection and mine safety production.

露天矿排土场边坡滑坡灾害频繁发生，研究其破坏机理对矿山环境保护和安全生产具有重要意义。本文对不同倾角的排土场进行了三组基础摩擦模型试验。基于更新的散斑分析和点跟踪技术，获得了排土场边坡的破坏过程，重点分析了边坡的发生机制、破坏模式和稳定性。研究结果表明：倾斜基础的排土场边坡具有明显的递进破坏特征，且受倾斜基础的影响，排土场边坡破坏模式存在显著差异。根据试验边坡的运动特征，将边坡的变形过程分为均匀变形阶段、局部破坏阶段和整体失稳阶段三个阶段。以模型进入局部破坏和整体失稳的特征矩为稳定性评价指标，表明抗倾斜地基边坡稳定性最好，水平边坡次之，下倾斜地基边坡稳定性最差，与其他结果基本一致。在FLAC3D软件中采用强度折减法得到边坡的滑动面几何形状和安全系数。数值模拟得出的软倾斜地基排土场边坡变形特征与前人基础摩擦模型试验结果基本一致。研究还发现，随着基底倾角的变化，不同类型的基础排土场的滑动面逐渐由多线形变为弧形。研究结果可为软倾斜基础上排土场边坡稳定性评价提供定性认识，对矿山环境保护和矿山安全生产具有重要意义。

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引用次数: 0