International Journal of Mining Science and Technology最新文献_第8页

Fracturing mechanism of pre-damaged granite induced by multi-source dynamic disturbances in tunnels 隧道中多源动力扰动致预损伤花岗岩破裂机理

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.001

Biao Wang, Benguo He, Xiating Feng, Hongpu Li

To elucidate the fracturing mechanism of deep hard rock under complex disturbance environments, this study investigates the dynamic failure behavior of pre-damaged granite subjected to multi-source dynamic disturbances. Blasting vibration monitoring was conducted in a deep-buried drill-and-blast tunnel to characterize in-situ dynamic loading conditions. Subsequently, true triaxial compression tests incorporating multi-source disturbances were performed using a self-developed wide-low-frequency true triaxial system to simulate disturbance accumulation and damage evolution in granite. The results demonstrate that combined dynamic disturbances and unloading damage significantly accelerate strength degradation and trigger shear-slip failure along preferentially oriented blast-induced fractures, with strength reductions up to 16.7%. Layered failure was observed on the free surface of pre-damaged granite under biaxial loading, indicating a disturbance-induced fracture localization mechanism. Time–stress–fracture–energy coupling fields were constructed to reveal the spatiotemporal characteristics of fracture evolution. Critical precursor frequency bands (105–150, 185–225, and 300–325 kHz) were identified, which serve as diagnostic signatures of impending failure. A dynamic instability mechanism driven by multi-source disturbance superposition and pre-damage evolution was established. Furthermore, a grouting-based wave-absorption control strategy was proposed to mitigate deep dynamic disasters by attenuating disturbance amplitude and reducing excitation frequency.

为阐明复杂扰动环境下深部硬岩的破裂机理，研究了多源动态扰动下预损伤花岗岩的动态破坏行为。对某深埋钻爆隧道进行了爆破振动监测，以表征现场动荷载条件。随后，采用自行研制的宽低频真三轴系统进行了多源扰动的真三轴压缩试验，模拟了花岗岩扰动积累和损伤演化过程。结果表明，动力扰动和卸载损伤联合作用显著加速了强度退化，并引发了沿优先取向爆破裂隙的剪切滑移破坏，强度降低幅度高达16.7%。在双轴载荷作用下，预损伤花岗岩自由表面出现层状破坏，表明扰动诱发的断裂局部化机制。构建时间-应力-断裂-能量耦合场，揭示裂缝演化的时空特征。确定了临界前驱频段（105 - 150khz， 185-225 kHz和300-325 kHz），作为即将发生故障的诊断特征。建立了多源扰动叠加和预损伤演化驱动的动态失稳机制。此外，提出了一种基于注浆的吸波控制策略，通过衰减扰动幅度和降低激励频率来减轻深层动力灾害。

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引用次数: 0

PFC-FDEM multi-scale cross-platform numerical simulation of thermal crack network evolution and SHTB dynamic mechanical response of rocks 岩石热裂纹网络演化及SHTB动态力学响应的PFC-FDEM多尺度跨平台数值模拟

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.013

Yue Zhai , Shaoxu Hao , Shi Liu , Yu Jia

Underground engineering in extreme environments necessitates understanding rock mechanical behavior under coupled high-temperature and dynamic loading conditions. This study presents an innovative multi-scale cross-platform PFC-FDEM coupling methodology that bridges microscopic thermal damage mechanisms with macroscopic dynamic fracture responses. The breakthrough coupling framework introduces: (1) bidirectional information transfer protocols enabling seamless integration between PFC’s particle-scale thermal damage characterization and FDEM’s continuum-scale fracture propagation, (2) multi-physics mapping algorithms that preserve crack network geometric invariants during scale transitions, and (3) cross-platform cohesive zone implementations for accurate SHTB dynamic loading simulation. The coupled approach reveals distinct three-stage crack evolution characteristics with temperature-dependent density following an exponential model. High-temperature exposure significantly reduces dynamic strength ratio (60% at 800 °C) and diminishes strain-rate sensitivity, with dynamic increase factor decreasing from 1.0 to 2.2 (25 °C) to 1.0–1.3 (800 °C). Critically, the coupling methodology captures fundamental energy redistribution mechanisms: thermal crack networks alter elastic energy proportion from 75% to 35% while increasing fracture energy from 5% to 30%. Numerical predictions demonstrate excellent experimental agreement (±8% peak stress–strain errors), validating the PFC-FDEM coupling accuracy. This integrated framework provides essential computational tools for predicting complex thermal–mechanical rock behavior in underground engineering applications.

极端环境下的地下工程需要了解岩石在高温动载耦合作用下的力学行为。该研究提出了一种创新的多尺度跨平台PFC-FDEM耦合方法，将微观热损伤机制与宏观动态断裂响应联系起来。突破耦合框架引入：(1)双向信息传输协议，实现PFC颗粒尺度热损伤表征与FDEM连续尺度裂缝扩展之间的无缝集成；(2)多物理场映射算法，在尺度转换期间保持裂缝网络几何不变性；(3)跨平台内聚区实现，实现精确的SHTB动态加载模拟。耦合方法揭示了裂纹随温度密度变化的明显的三阶段演化特征，遵循指数模型。高温暴露显著降低动态强度比（800℃时为60%），降低应变率敏感性，动态增加因子从1.0 ~ 2.2（25℃）降至1.0 ~ 1.3（800℃）。关键是，耦合方法捕捉到了基本的能量再分配机制：热裂缝网络将弹性能比例从75%改变到35%，同时将断裂能从5%增加到30%。数值预测证明了极好的实验一致性（±8%峰值应力-应变误差），验证了PFC-FDEM耦合的准确性。这个集成框架为地下工程应用中预测复杂的岩石热力学行为提供了必要的计算工具。

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引用次数: 0

A quantitative fracability evaluation method and its application to deep shale gas development in Sichuan Basin, China 四川盆地深层页岩气可压性定量评价方法及其应用

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.007

Guokai Zhao , Yintong Guo , Chunhe Yang , Mingyang Wu , Junchuan Gui , Shilong Teng , Lei Wang , Xinao Zhang

Fracability evaluation is critical for efficiently extracting deep shale gas using hydraulic fracturing to avoid blind drilling and fracking. However, existing fracability indices often fail to systematically consider the mechanical behavior of rocks at high temperatures and high pressures (HTHP), coupled with geostress distributions and heterogeneous reservoir characteristics. This critical omission limits their effectiveness in accurately identifying the optimal fracability sweet spots within deep reservoirs. In this work, a fracability evaluation model was proposed based on the combined weighting method, integrating the improved brittleness index, rock strength, geostresses and natural weakness characteristics. A fracability grading evaluation was carried out to determine the potential fracture characteristics corresponding to shales with different fracability levels. Additionally, the fracability index was used for field validation and applications. Results show that rock brittleness and fracability are not equivalent for deep reservoirs. The fracability index is closely related to the pay zones and actual gas production, with a correlation as high as 84%, implying that the proposed method has practical significance in both experimental and field applications. The above findings can provide theoretical guidance for the selection of fracturing candidates and the optimal design of fracturing in deep resource development.

可压裂性评价是利用水力压裂高效开采深层页岩气、避免盲钻和压裂的关键。然而，现有的可压性指标往往不能系统地考虑岩石在高温高压下的力学行为，以及地应力分布和非均质储层特征。这种关键性的遗漏限制了它们准确识别深层储层最佳可压性甜点的有效性。综合改进后的脆性指数、岩石强度、地应力和自然弱点特征，提出了基于组合加权法的脆性评价模型。通过可压性分级评价，确定不同可压性水平页岩对应的潜在裂缝特征。此外，利用可压性指数进行了现场验证和应用。结果表明，深层储层的岩石脆性和可压性并不等效。可压性指数与产层和实际产气量密切相关，相关性高达84%，表明该方法在实验和现场应用中都具有实际意义。上述研究结果可为深部资源开发中压裂候选物的选择和压裂优化设计提供理论指导。

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引用次数: 0

Controlling magnetic agglomeration in superconducting high gradient magnetic separation processing of iron ore tailings for high-grade silica recovery 铁尾矿超导高梯度磁选回收高品位二氧化硅过程中磁团聚控制

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.006

Yongkui Li , Suqin Li , Zekun Zhao

The superconducting high gradient magnetic separation (S-HGMS) technology can be used to effectively extract silica from iron ore tailings (IOTs). However, particle agglomeration in strong magnetic fields poses a challenge in achieving optimal performance. In this study, we investigated the agglomeration of IOT particles and the mechanisms for its inhibition through surface analysis, density functional theory (DFT), and extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) theory. Hematite was found to exhibit the highest magnetic moment among the minerals present in IOTs, making it particularly prone to magnetic agglomeration. The addition of the dispersant SDSH into the slurry was essential in promoting the dispersion of IOT particles during the S-HGMS process. This dispersant hydrolyzed to form HPO₄²⁻ and RSO₃⁻ groups in the solution, which then chemically adsorbed onto the metal ions exposed on the surfaces of non-quartz particles, increasing interparticle electrostatic repulsion. Furthermore, the RSO₃⁻ groups physically adsorbed onto the surface of quartz particles, resulting in strong steric repulsion and enhancing the hydrophilicity of the particle surfaces, thereby inhibiting magnetic agglomeration between the particles. Under optimal conditions, the SiO₂ grade of the obtained high-grade silica powder increased from an initial value of 76.32% in IOTs to 97.42%, achieving a SiO₂ recovery rate of 54.81%, which meets the requirements for quartz sand used in glass preparation. This study provides valuable insights into the magnetic agglomeration of IOT particles and its inhibition while providing a foundation for regulating S-HGMS processes.

超导高梯度磁选（S-HGMS）技术可以有效地从铁矿尾矿中提取二氧化硅。然而，粒子在强磁场中的团聚对实现最佳性能提出了挑战。在这项研究中，我们通过表面分析、密度泛函理论（DFT）和扩展的derjaguin - landau - vervey - overbeek （EDLVO）理论研究了物联网颗粒的团聚及其抑制机制。研究发现，在物联网中存在的矿物中，赤铁矿表现出最高的磁矩，使其特别容易发生磁团聚。在S-HGMS过程中，在浆料中加入分散剂SDSH对于促进IOT颗粒的分散至关重要。该分散剂在溶液中水解形成HPO42 -和RSO3 -基团，然后化学吸附到暴露在非石英颗粒表面的金属离子上，增加颗粒间的静电斥力。此外，RSO3−基团物理吸附在石英颗粒表面，产生强烈的空间排斥力，增强颗粒表面的亲水性，从而抑制颗粒之间的磁团聚。在最优条件下，所制得的优质硅粉的SiO2品位由初始物相中的76.32%提高到97.42%，SiO2回收率达到54.81%，满足玻璃制砂石英砂的要求。该研究为研究物联网颗粒的磁团聚及其抑制提供了有价值的见解，同时为调节S-HGMS过程提供了基础。

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引用次数: 0

Experimental and numerical studies on rock damage law in straight-hole cut blasting under biaxial confining pressure 双轴围压下直孔切孔爆破岩石损伤规律的实验与数值研究

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.011

Xiantang Zhang , Zhaobin Li , Hui Yu , Hongmin Zhou , Hongli Wang , Xiangtuan Jiao , Fuzhi Wang

To study the relationships between rock mass crack propagation and damage and confining pressure under blast impact loading during straight-hole cut blasting, tests were performed under different confining pressures. Then, the characteristics of rock mass crack development were analyzed, and the pressure resistance values of core samples before and after blasting were compared to study the trends of rock mass damage. Moreover, a three-dimensional numerical simulation model was established by LS-DYNA to analyze the stress wave propagation, cavity shape and crack propagation characteristics under different confining pressures. The propagation of rock blasting cracks is negatively correlated with the confining pressure. The greater the confining pressure, the shorter the crack development time. Additionally, the crack width is reduced from 0.4–1.7 to 0.04–1.4 mm, and the length is shortened from 280 to 120 mm. A comparison of the compressive strength revealed that blasting reduces the compressive strength of the rock mass. The greater the distance from the explosion source, the lower the degree of strength attenuation. An increase in the confining pressure can inhibit strength attenuation. Numerical simulations revealed that under the same confining pressure, the stress first peaks at the bottom of the blast hole. The greater the confining pressure, the longer the stress peak duration, the smaller the cavity volume, and the shorter the crack propagation length and depth. Under a confining pressure of 4 MPa, the longest crack was only 154.5 mm in length and 102 mm in depth. The research results provide a scientific basis for controlling rock damage and optimizing design in the excavation of deep rock roadways by blasting.

为研究直孔切孔爆破冲击载荷作用下岩体裂纹扩展及损伤与围压的关系，进行了不同围压条件下的试验研究。然后，分析岩体裂缝发育特征，对比爆破前后岩心试样的耐压值，研究岩体损伤趋势；利用LS-DYNA建立了三维数值模拟模型，分析了不同围压下应力波传播、空腔形态和裂纹扩展特性。岩石爆破裂纹的扩展与围压呈负相关。围压越大，裂缝发展时间越短。裂缝宽度由0.4 ~ 1.7 mm减小到0.04 ~ 1.4 mm，裂缝长度由280 ~ 120 mm缩短。对比结果表明，爆破降低了岩体的抗压强度。距离爆炸源越远，强度衰减程度越低。围压的增加可以抑制强度衰减。数值模拟结果表明，在相同围压条件下，爆破孔底部应力首先达到峰值。围压越大，应力峰值持续时间越长，空腔体积越小，裂纹扩展长度和深度越短。围压为4 MPa时，最长裂缝长度仅为154.5 mm，深度仅为102 mm。研究结果为深部岩巷爆破开挖控制岩石损伤和优化设计提供了科学依据。

{"title":"Experimental and numerical studies on rock damage law in straight-hole cut blasting under biaxial confining pressure","authors":"Xiantang Zhang , Zhaobin Li , Hui Yu , Hongmin Zhou , Hongli Wang , Xiangtuan Jiao , Fuzhi Wang","doi":"10.1016/j.ijmst.2025.08.011","DOIUrl":"10.1016/j.ijmst.2025.08.011","url":null,"abstract":"<div><div>To study the relationships between rock mass crack propagation and damage and confining pressure under blast impact loading during straight-hole cut blasting, tests were performed under different confining pressures. Then, the characteristics of rock mass crack development were analyzed, and the pressure resistance values of core samples before and after blasting were compared to study the trends of rock mass damage. Moreover, a three-dimensional numerical simulation model was established by LS-DYNA to analyze the stress wave propagation, cavity shape and crack propagation characteristics under different confining pressures. The propagation of rock blasting cracks is negatively correlated with the confining pressure. The greater the confining pressure, the shorter the crack development time. Additionally, the crack width is reduced from 0.4–1.7 to 0.04–1.4 mm, and the length is shortened from 280 to 120 mm. A comparison of the compressive strength revealed that blasting reduces the compressive strength of the rock mass. The greater the distance from the explosion source, the lower the degree of strength attenuation. An increase in the confining pressure can inhibit strength attenuation. Numerical simulations revealed that under the same confining pressure, the stress first peaks at the bottom of the blast hole. The greater the confining pressure, the longer the stress peak duration, the smaller the cavity volume, and the shorter the crack propagation length and depth. Under a confining pressure of 4 MPa, the longest crack was only 154.5 mm in length and 102 mm in depth. The research results provide a scientific basis for controlling rock damage and optimizing design in the excavation of deep rock roadways by blasting.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 9","pages":"Pages 1529-1541"},"PeriodicalIF":13.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An experimental and theoretical study on the influence of stress gradients on the propagation of hydraulic fractures 应力梯度对水力裂缝扩展影响的实验与理论研究

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.014

Junchi Liu , Yuping Sun , Pingping Liang , Yintong Guo , Yuting He , Wenjie Xu , Duanyang Zhuang , Jinlong Li , Liangtong Zhan , Jianfu Shao , Yunmin Chen

Hydraulic fracture growth is significantly influenced by the minimum horizontal principal stress gradient and the fracturing fluid pressure gradient. However, these gradients are often neglected in scaled physical modeling experiments due to difficulties in reproducing them. This study uses centrifugal hypergravity to simulate both gradients and investigate their effects on fracture propagation. Artificial mortar specimens (ϕ200 mm × 400 mm) are fractured under 1g (normal gravity), 50g, and 100g. Results show that compared to 1g, fractures under 50g and 100g exhibit increasingly uneven propagation, with higher g-values leading to greater asymmetry. To interpret this, a theoretical analysis based on fracture mechanics is conducted. When the fluid pressure gradient exceeds the stress gradient, a positive net gradient is generated, increasing net pressure at the lower fracture tip. This raises the stress intensity factor at the lower tip, promoting downward growth. As g increases, the disparity becomes more significant, resulting in greater fracture deviation. In conclusion, this study, for the first time, has verified and explained that the net gradient can change the propagation of hydraulic fractures, providing important guidance for wellbore placement under stress gradients.

水力裂缝发育受最小水平主应力梯度和压裂液压力梯度的显著影响。然而，由于难以再现这些梯度，这些梯度在比例物理建模实验中经常被忽略。本研究使用离心超重力模拟这两种梯度，并研究它们对裂缝扩展的影响。人造砂浆试件（φ 200mm × 400mm）分别在1g（正常重力）、50g、100g下断裂。结果表明：与1g相比，50g和100g下的断口扩展越来越不均匀，g值越高，不对称性越大；为了解释这一点，进行了基于断裂力学的理论分析。当流体压力梯度超过应力梯度时，产生正的净梯度，使下裂缝尖端的净压力增大。这提高了下尖端的应力强度因子，促进了向下生长。随着g的增大，这种差异变得更显著，导致裂缝偏差更大。综上所述，本研究首次验证并解释了净梯度可以改变水力裂缝的扩展，为应力梯度下的井筒布置提供了重要指导。

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引用次数: 0

Dynamic failure analysis and support optimization for web pillars under static and dynamic loading using catastrophe theory 基于突变理论的静、动荷载作用下腹板柱动力破坏分析与支护优化

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.004

Juyu Jiang , Yulong Zhang , Laigui Wang , Changbo Du , Jun Xu

Web pillars enduring complex coupled loads are critical for stability in high-wall mining. This study develops a dynamic failure criterion for web pillars under non-uniform loading using catastrophe theory. Through the analysis of the web pillar-overburden system’s dynamic stress and deformation, a total potential energy function and dynamic failure criterion were established for web pillars. An optimizing method for web pillar parameters was developed in highwall mining. The dynamic criterion established was used to evaluate the dynamic failure and stability of web pillars under static and dynamic loading. Key findings reveal that vertical displacements exhibit exponential-trigonometric variation under static loads and multi-variable power-law behavior under dynamic blasting. Instability risks arise when the roof’s tensile strength-to-stress ratio drops below 1. Using catastrophe theory, the bifurcation set Δ<0 signals sudden instability. The criterion defines failure as when the unstable web pillar section length l₁ exceeds the roof’s critical collapse distance l₂. Case studies and simulations determine an optimal web pillar width of 4.6 m. This research enhances safety and resource recovery, providing a theoretical framework for advancing highwall mining technology.

承受复杂耦合载荷的腹板矿柱是保证高壁开采稳定性的关键。利用突变理论建立了腹板柱在非均布荷载作用下的动态破坏准则。通过对腹板柱—覆盖层系统动应力和动变形的分析，建立了腹板柱的总势能函数和动力破坏准则。提出了一种高壁开采腹板矿柱参数优化方法。将所建立的动力判据用于评价静、动荷载作用下腹板柱的动力破坏和稳定性。主要研究结果表明，静荷载作用下竖向位移呈指数-三角变化，动力爆破作用下竖向位移呈多变量幂律变化。当顶板抗拉强度应力比小于1时，存在失稳风险。利用突变理论，分岔集Δ<；0表示突然不稳定。该准则将破坏定义为不稳定腹板柱截面长度l1超过顶板的临界坍塌距离l2。案例研究和模拟确定了最佳腹板柱宽度为4.6 m。该研究提高了开采安全性和资源回收率，为推进高壁采矿技术提供了理论框架。

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引用次数: 0

Shear mechanical responses and debonding failure mechanisms of bolt-resin-rock anchoring system under dynamic normal load boundary 动态法向荷载边界下锚杆-树脂-岩石锚固体系剪切力学响应及脱粘破坏机制

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.005

Xinxin Nie , Qian Yin , Zhigang Tao , Manchao He , Gang Wang , Wenhua Zha , Zhaobo Li , Yajun Ren

Under external disturbances, the shear mechanical responses and debonding failure mechanisms at anisotropic interfaces of anchoring system composed of multiphase media are inherently difficult to characterize due to the concealment nature of interfacial interactions. This study establishes an equivalent shear model for a bolt-resin-rock anchoring system and conducts direct shear tests under dynamic normal load (DNL) boundary from both laboratory experiments and discrete element method (DEM) simulations. The research investigates the influence of normal dynamic load amplitude (A_n) and rock type on shear strength parameters, elucidating the evolutionary characteristics and underlying mechanisms of shear load and normal displacement fluctuations induced by cyclic normal loading, with maximum shear load decreasing by 36.81% to 46.94% as A_n increases from 10% to 70% when rock type varies from coal to limestone. Through analysis of strain field evolution, the critical impact of rock type on localization of shear failure surface is revealed, with systematic summarization of differentiated wear characteristics, failure modes, and key controlling factors associated with shear failure surface. Mesoscopic investigations enabled by DEM simulations uncover the nonuniform distribution of contact force chains within the material matrix and across the anisotropic interfaces under various DNL boundaries, clarify rock type dependent crack propagation pathways, and quantitatively assess the damage extent of shear failure surface, with the anisotropic interface damage factor increasing from 34.9% to 56.6% as A_n rises from 10% to 70%, and decreasing from 49.6% to 23.4% as rock type varies from coal to limestone.

在外界干扰下，多相介质组成的锚固体系各向异性界面剪切力学响应和脱粘破坏机制由于界面相互作用的隐蔽性而难以表征。本文建立了锚杆-树脂-岩石锚固体系的等效剪切模型，并从室内试验和离散元法模拟两方面进行了动法向载荷（DNL）边界下的直剪试验。研究了法向动荷载幅值（An）和岩石类型对抗剪强度参数的影响，阐明了循环法向加载引起的剪切荷载和法向位移波动的演化特征和潜在机制，当岩石类型从煤到灰岩时，当An从10%增加到70%时，最大剪切荷载降低36.81% ~ 46.94%。通过对应变场演化的分析，揭示了岩石类型对剪切破坏面局部化的关键影响，系统总结了剪切破坏面的不同磨损特征、破坏模式和关键控制因素。基于DEM模拟的细观研究揭示了各向异性界面下接触力链在材料基体内部和各向异性界面上的不均匀分布，阐明了岩石类型相关的裂纹扩展路径，定量评价了剪切破坏面损伤程度，各向异性界面损伤因子从34.9%增加到56.6%，An从10%增加到70%；随着岩石类型从煤到灰岩的变化，从49.6%下降到23.4%。

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引用次数: 0

Damage and fracture law of outburst coal bodies in tectonic zones under impact disturbances 冲击扰动作用下构造带突出煤体的破坏与断裂规律

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.08.002

Lingran Ren , Liping Li , Jupeng Tang , Yishan Pan , Song Yang , Xin Zhang

The geological tectonic zone is closely related to outburst. Taking the outburst coal bodies in tectonic zones as the research object, combined with DIC and AE monitoring technologies and discrete element simulation, the mechanical response, crack evolution and energy characteristics of coal bodies under different loading rates (impact disturbances) were studied. The results show that both the uniaxial compressive strength and elastic modulus are positively correlated with the loading rate, with a maximum increase in compressive strength of 25.15%. The uniaxial compressive strength is more sensitive to impact disturbances. The failure modes of coal bodies can be divided into the “slip-crack synchronization (S & C) type” and the “crack-first-then-slip (C & S) type”. The slip in tectonic zones is more severe at high loading rates. At low loading rates, shear cracks dominate (60.01%), while the proportion of tensile cracks increases significantly (70.52%) at high loading rates. Additionally, the rate of axial crack growth decreases as the loading rate increases. The peak values of total energy and dissipated energy increase significantly with the loading rate, and the peak energy of the C & S type is greater than that of the S & C type. Energy is preferentially released through the slip of tectonic zones and the propagation of radial cracks.

地质构造带与突出密切相关。以构造带突出煤体为研究对象，结合DIC和AE监测技术及离散元模拟，研究了不同加载速率（冲击扰动）下煤体的力学响应、裂纹演化及能量特征。结果表明：单轴抗压强度和弹性模量均与加载速率呈正相关，加载速率最大可使单轴抗压强度提高25.15%；单轴抗压强度对冲击扰动更为敏感。煤体破坏模式可分为“滑裂同步（S & &； C）型”和“先裂后滑（C & &； S）型”。构造带的滑动在高加载速率下更为严重。在低加载速率下，剪切裂纹占主导地位（60.01%），而在高加载速率下，拉伸裂纹的比例显著增加（70.52%）。轴向裂纹扩展速率随加载速率的增大而减小。总能量和耗散能量峰值随加载速率的增加而显著增大，且C &； S型峰值能量大于S &； C型峰值能量。能量优先通过构造带的滑动和径向裂缝的扩展释放。

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引用次数: 0

Desorption-diffusion specificity of deep coalbed methane under high-temperature effects: Implications for development 高温作用下深层煤层气解吸扩散特性：对开发的启示

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-09-01 DOI: 10.1016/j.ijmst.2025.07.013

Benju Lu , Zhaobiao Yang , Yuting Hou , Cunlei Li , Jianan Wang , Changqing Liu , Yuhao Yao

China’s deep coalbed methane (CBM) resources demonstrate immense potential with extensive developmental prospects. However, the coupling relationship between the negative adsorption effect and the positive desorption-promotion effect under high-temperature conditions remains unclear. In this study, a self-built high-temperature adsorption-desorption system was used to investigate the coupled effects of temperature and coal rank on methane adsorption-desorption behavior in deep CBM. The results show that elevated temperatures significantly reduce methane adsorption capacity, with high-rank coals exhibiting greater sensitivity. Conversely, high-temperature conditions significantly enhance methane desorption and diffusion behavior, accelerating initial desorption rates, enabling rapid gas release in a short period, and thus improving desorption efficiency. The desorption volume and desorption-diffusion rate exhibited an asymmetric U-shaped variation with coal rank. By coupling the positive and negative effects of temperature and defining the desorption ratio, it was found that a 10 K increase in temperature raised the desorption ratio by 3.78%–8.05%. Finally, an effective gas content prediction model is proposed, and the key regulatory role of temperature in the resource potential and gas production characteristics of deep CBM is clarified. These findings can provide theoretical guidance for the subsequent optimization of deep CBM exploration and development strategies.

中国深部煤层气资源潜力巨大，开发前景广阔。然而，高温条件下负吸附效应与正解吸促进效应之间的耦合关系尚不清楚。本文采用自建的高温吸附-解吸系统，研究了温度和煤阶对煤层气深层甲烷吸附-解吸行为的耦合影响。结果表明，温度升高会显著降低甲烷吸附量，且高煤阶煤对甲烷的吸附敏感性更强。相反，高温条件显著增强了甲烷的解吸和扩散行为，加速了初始解吸速率，使气体在短时间内快速释放，从而提高了解吸效率。解吸体积和解吸扩散速率随煤阶呈不对称u型变化。通过耦合温度的正负效应，确定解吸比，发现温度每升高10 K，解吸比提高3.78% ~ 8.05%。最后，提出了有效的含气量预测模型，明确了温度对深部煤层气资源潜力和产气特征的关键调控作用。研究结果可为后续深部煤层气勘探开发策略优化提供理论指导。

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