Rock Mechanics Bulletin最新文献_第2页

Investigation of nanoindentation for evaluating the cyclic loading-unloading mechanical properties of heterogeneous coal 评价非均质煤循环加卸载力学性能的纳米压痕研究

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-09-07 DOI: 10.1016/j.rockmb.2025.100253

YuKai Fu , Yongzheng Wu , Sifeng He , Penghe Zhou , Junchen Li , Jie He

Exploring the meso-mechanical response of heterogeneous coal is crucial for understanding its macro mechanical behavior in coal mining, CO₂ storage, and coal bed methane production. However, a key gap remains in the insufficient elucidation of the precise linkage between heterogeneity-driven meso-response and macro-performance. In this investigation, nanoindentation tests were performed to compare the force-depth curves, reduced Young's modulus (E_r), hardness (H_IT), and the effect of holding time. Cyclic loading-unloading experiments were conducted at eight points of a polished coal sample, resulting in history cycles at five force levels (50, 100, 150, 200, and 250 mN). The mesoscopic mechanical properties were calculated at each cycle, and the time-dependent deformations at holding times of 5 s and 150 s were compared. Notably, the force-depth curves exhibited a "pop-in" phenomenon. The results indicate that the maximum depth increases with higher loads and cycles. Furthermore, the 150 s holding time resulted in larger deformations compared to the 5 s holding time. Both E_r and H_IT decrease with increasing cycles and load, and there exists a positive correlation between H_IT and E_r. The mean macro Young's modulus (E = 2.22 GPa) is smaller than the mean meso reduced Young's modulus (E_r = 12.28 GPa). The hardness ranges from 0.33 GPa to 0.89 GPa, with a mean value of 0.57 GPa. Due to the heterogeneity at both meso and macro scales, the test results vary across different positions.

探索非均质煤的细观力学响应对于理解其在煤炭开采、二氧化碳储存和煤层气生产中的宏观力学行为至关重要。然而，在异质性驱动的中观反应和宏观表现之间的精确联系的阐明方面仍然存在一个关键的差距。在本研究中，进行了纳米压痕测试，比较了力-深度曲线、降低杨氏模量（Er）、硬度（HIT）和保温时间的影响。在抛光煤样品的8个点上进行了循环加载-卸载实验，得到了5个力水平（50、100、150、200和250 mN）的历史循环。计算了每次循环时的细观力学性能，并比较了保温5 s和保温150 s时的随时间变形。值得注意的是，力-深度曲线呈现出“弹出”现象。结果表明，最大深度随载荷和循环次数的增加而增加。此外，150 s的保温时间比5 s的保温时间导致更大的变形。Er和HIT随循环次数和负荷的增加而减小，HIT与Er之间存在正相关关系。平均宏观杨氏模量（E = 2.22 GPa）小于平均介观缩减杨氏模量（Er = 12.28 GPa）。硬度范围为0.33 ~ 0.89 GPa，平均值为0.57 GPa。由于中观和宏观尺度的异质性，不同位置的测试结果会有所不同。

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引用次数: 0

Investigation of shale fracture behavior with different bedding properties based on discrete element method 基于离散元法的不同层理性质页岩破裂行为研究

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-09-06 DOI: 10.1016/j.rockmb.2025.100243

Dubo Wang , Jinyu Dong , Dongqiao Liu , Xiangjun Chen , Hai Zhong , Mijia Yang , Hongjian Wang

The interaction between cemented laminae and induced fractures plays a critical role in hydraulic fracture propagation within laminated shale reservoirs. By combining mode-I fracture mechanics experiment conducted on semi-circular bend (SCB) specimens of black carbonaceous shale from the marine Longmaxi Formation with numerical simulations, this study systematically investigates the effects of three key geological parameters: (1) bond strength, (2) vein stiffness, and (3) approach angle on fracture propagation characteristics. The key findings are summarized as follows: (1) Increasing the parallel bond strength promotes fracture crossing behavior. When the vein fracture toughness was reduced to 0.3, 0.2, and 0.1 times that of the shale matrix, fractures exhibited increased deflection tendency along the vein, creating longer stepped propagation paths. (2) For stiffer veins, induced fracture divert into the vein and propagate over longer distances; Additionally, more micro-cracks form within the vein before fracture-vein interaction occurs. (3) Fracture-vein interaction exhibits significant angular dependence: At approach angles between 60° and 90°, fractures predominantly penetrated laminae without deflection; Below 60°, fractures initially diverted into the vein but subsequently re-entered the matrix before reaching the vein terminus. This bifurcation pattern closely resembles laboratory observations of weakly cemented or pre-damaged vein specimens.

胶结层与诱导裂缝的相互作用对层状页岩储层水力裂缝的扩展起着至关重要的作用。通过对海相龙马溪组黑色碳质页岩半圆形弯曲（SCB）试样进行i型断裂力学实验与数值模拟相结合，系统研究了3个关键地质参数(1)黏结强度、(2)脉体刚度、(3)进近角对裂缝扩展特征的影响。主要研究结果如下：(1)增加平行粘结强度可促进断裂交叉行为。当岩脉断裂韧性降低到页岩基质的0.3、0.2和0.1倍时，裂缝沿岩脉的挠曲倾向增加，形成了更长的阶梯扩展路径。(2)对于较硬的矿脉，诱导断裂向矿脉内转移并传播较长距离；此外，在裂隙-脉相互作用发生之前，更多的微裂纹在脉内形成。(3)缝脉相互作用表现出明显的角度依赖性：在接近角为60°~ 90°时，裂缝主要穿透片层而不发生偏转；在60°以下，骨折最初转向静脉，但随后在到达静脉末端之前重新进入基质。这种分叉模式与实验室观察到的弱胶结或预损伤静脉标本非常相似。

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引用次数: 0

Investigation of shale fracture behavior with different bedding properties based on discrete element method 基于离散元法的不同层理性质页岩破裂行为研究

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-09-06 DOI: 10.1016/j.rockmb.2025.100243

Dubo Wang , Jinyu Dong , Dongqiao Liu , Xiangjun Chen , Hai Zhong , Mijia Yang , Hongjian Wang

The interaction between cemented laminae and induced fractures plays a critical role in hydraulic fracture propagation within laminated shale reservoirs. By combining mode-I fracture mechanics experiment conducted on semi-circular bend (SCB) specimens of black carbonaceous shale from the marine Longmaxi Formation with numerical simulations, this study systematically investigates the effects of three key geological parameters: (1) bond strength, (2) vein stiffness, and (3) approach angle on fracture propagation characteristics. The key findings are summarized as follows: (1) Increasing the parallel bond strength promotes fracture crossing behavior. When the vein fracture toughness was reduced to 0.3, 0.2, and 0.1 times that of the shale matrix, fractures exhibited increased deflection tendency along the vein, creating longer stepped propagation paths. (2) For stiffer veins, induced fracture divert into the vein and propagate over longer distances; Additionally, more micro-cracks form within the vein before fracture-vein interaction occurs. (3) Fracture-vein interaction exhibits significant angular dependence: At approach angles between 60° and 90°, fractures predominantly penetrated laminae without deflection; Below 60°, fractures initially diverted into the vein but subsequently re-entered the matrix before reaching the vein terminus. This bifurcation pattern closely resembles laboratory observations of weakly cemented or pre-damaged vein specimens.

胶结层与诱导裂缝的相互作用对层状页岩储层水力裂缝的扩展起着至关重要的作用。通过对海相龙马溪组黑色碳质页岩半圆形弯曲（SCB）试样进行i型断裂力学实验与数值模拟相结合，系统研究了3个关键地质参数(1)黏结强度、(2)脉体刚度、(3)进近角对裂缝扩展特征的影响。主要研究结果如下：(1)增加平行粘结强度可促进断裂交叉行为。当岩脉断裂韧性降低到页岩基质的0.3、0.2和0.1倍时，裂缝沿岩脉的挠曲倾向增加，形成了更长的阶梯扩展路径。(2)对于较硬的矿脉，诱导断裂向矿脉内转移并传播较长距离；此外，在裂隙-脉相互作用发生之前，更多的微裂纹在脉内形成。(3)缝脉相互作用表现出明显的角度依赖性：在接近角为60°~ 90°时，裂缝主要穿透片层而不发生偏转；在60°以下，骨折最初转向静脉，但随后在到达静脉末端之前重新进入基质。这种分叉模式与实验室观察到的弱胶结或预损伤静脉标本非常相似。

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引用次数: 0

The frictional sliding properties of antigorite gouge under hydrothermal conditions 热液条件下反长岩泥的摩擦滑动特性

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-09-01 DOI: 10.1016/j.rockmb.2025.100244

Shimin Liu , Mengke An , Wenhao Dai , Huiru Lei , Lei Zhang , Yongsheng Zhou , Zekang Yang

As a weak mineral overlying subduction-zone faults, the widespread presence of antigorite can markedly affect subduction-zone dynamics. To better understand the mechanical properties of antigorite-bearing faults, we conducted frictional sliding experiments on antigorite under hydrothermal conditions. The experimental setup involved a constant confining pressure of 100 MPa, a low pore fluid pressure of 30 MPa, and temperatures ranging from 100 °C to 500 °C. We varied the axial loading rate between 0.04, 0.2, and 1.0 μm/s to examine the velocity dependence of the friction coefficient. The results showed that the friction coefficient of antigorite exhibited a significant temperature dependence. Between 100 °C and 400 °C, the friction coefficient decreased from 0.66 to 0.54 as the temperature increased. Above 400 °C, the friction coefficient increased, reaching 0.7. The velocity dependence of antigorite exhibited velocity strengthening (a – b > 0) throughout the entire experimental temperature range (100 °C–500 °C). The impact of pore-fluid pressure on the frictional behavior of antigorite was also significant. Under low pore-fluid pressure (30 MPa), the frictional strength increases above 400 °C, associated with dehydration hardening. In contrast, at high pore fluid pressure, frictional weakening continues at elevated temperatures, indicating that pore fluid pressure plays a crucial role in regulating the frictional stability of antigorite. Our experimental results demonstrate that the pore fluid pressure plays a key role in regulating the temperature-dependent frictional behavior of antigorite, highlighting the need for further investigation under varying fluid pressure conditions.

反长花岗岩作为一种弱矿物覆在俯冲带断裂上，其广泛存在对俯冲带动力学具有显著影响。为更好地了解含反长花岗岩断裂的力学性质，开展了热液条件下反长花岗岩的摩擦滑动实验。实验设置为围压为100 MPa，低孔隙流体压力为30 MPa，温度范围为100℃至500℃。我们将轴向加载速率在0.04、0.2和1.0 μm/s之间变化，以研究摩擦系数与速度的关系。结果表明，反长岩的摩擦系数表现出明显的温度依赖性。在100 ~ 400℃之间，随着温度的升高，摩擦系数从0.66下降到0.54。在400℃以上，摩擦系数增大，达到0.7。在整个实验温度范围内（100℃~ 500℃），反长岩的速度依赖性表现为速度增强（a ~ b > 0）。孔隙流体压力对反长岩摩擦行为的影响也很显著。在低孔隙流体压力（30 MPa）下，摩擦强度在400℃以上增加，与脱水硬化有关。相反，在高孔隙流体压力下，随着温度的升高，摩擦作用持续减弱，表明孔隙流体压力对反长岩的摩擦稳定性起着至关重要的调节作用。我们的实验结果表明，孔隙流体压力在调节反长岩的温度依赖摩擦行为中起着关键作用，强调了在不同流体压力条件下进一步研究的必要性。

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引用次数: 0

The frictional sliding properties of antigorite gouge under hydrothermal conditions 热液条件下反长岩泥的摩擦滑动特性

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-09-01 DOI: 10.1016/j.rockmb.2025.100244

Shimin Liu , Mengke An , Wenhao Dai , Huiru Lei , Lei Zhang , Yongsheng Zhou , Zekang Yang

As a weak mineral overlying subduction-zone faults, the widespread presence of antigorite can markedly affect subduction-zone dynamics. To better understand the mechanical properties of antigorite-bearing faults, we conducted frictional sliding experiments on antigorite under hydrothermal conditions. The experimental setup involved a constant confining pressure of 100 MPa, a low pore fluid pressure of 30 MPa, and temperatures ranging from 100 °C to 500 °C. We varied the axial loading rate between 0.04, 0.2, and 1.0 μm/s to examine the velocity dependence of the friction coefficient. The results showed that the friction coefficient of antigorite exhibited a significant temperature dependence. Between 100 °C and 400 °C, the friction coefficient decreased from 0.66 to 0.54 as the temperature increased. Above 400 °C, the friction coefficient increased, reaching 0.7. The velocity dependence of antigorite exhibited velocity strengthening (a – b > 0) throughout the entire experimental temperature range (100 °C–500 °C). The impact of pore-fluid pressure on the frictional behavior of antigorite was also significant. Under low pore-fluid pressure (30 MPa), the frictional strength increases above 400 °C, associated with dehydration hardening. In contrast, at high pore fluid pressure, frictional weakening continues at elevated temperatures, indicating that pore fluid pressure plays a crucial role in regulating the frictional stability of antigorite. Our experimental results demonstrate that the pore fluid pressure plays a key role in regulating the temperature-dependent frictional behavior of antigorite, highlighting the need for further investigation under varying fluid pressure conditions.

反长花岗岩作为一种弱矿物覆在俯冲带断裂上，其广泛存在对俯冲带动力学具有显著影响。为更好地了解含反长花岗岩断裂的力学性质，开展了热液条件下反长花岗岩的摩擦滑动实验。实验设置为围压为100 MPa，低孔隙流体压力为30 MPa，温度范围为100℃至500℃。我们将轴向加载速率在0.04、0.2和1.0 μm/s之间变化，以研究摩擦系数与速度的关系。结果表明，反长岩的摩擦系数表现出明显的温度依赖性。在100 ~ 400℃之间，随着温度的升高，摩擦系数从0.66下降到0.54。在400℃以上，摩擦系数增大，达到0.7。在整个实验温度范围内（100℃~ 500℃），反长岩的速度依赖性表现为速度增强（a ~ b > 0）。孔隙流体压力对反长岩摩擦行为的影响也很显著。在低孔隙流体压力（30 MPa）下，摩擦强度在400℃以上增加，与脱水硬化有关。相反，在高孔隙流体压力下，随着温度的升高，摩擦作用持续减弱，表明孔隙流体压力对反长岩的摩擦稳定性起着至关重要的调节作用。我们的实验结果表明，孔隙流体压力在调节反长岩的温度依赖摩擦行为中起着关键作用，强调了在不同流体压力条件下进一步研究的必要性。

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引用次数: 0

Control of rock burst during deep tunnel blasting excavation based on energy release process optimizing 基于能量释放过程优化的深埋巷道爆破开挖地压控制

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-08-23 DOI: 10.1016/j.rockmb.2025.100239

Sheng Luo , Qian Yuan , Dong Zhihong , Zhou Liming , Zhou Chunhua , Yang Zhaowei , Yan Peng

Blasting is widely used in hard rock tunnel excavation but often deteriorates the mechanical properties of the rock mass, forming a disturbance zone associated with energy evolution in the surrounding rock. In high-stress environments, this disturbance zone poses risks of engineering disasters like rock bursts. Previous studies confirm that optimizing the energy release process is an effective strategy for rock burst control. This research focuses on enhancing energy path optimization by analyzing parameters affecting the formation of the disturbance zone. Specifically, we conducted a sensitivity analysis of key blasting parameters, including caving hole spacing, caving blasting load, smooth blasting burden, hole spacing, and smooth blasting load. By exploring the impact of caving and smooth blasting under varied design conditions, we developed a method to control rock bursts through staged energy release, gradually disturbing the surrounding rock. Results indicate that aligning the disturbance zones induced by caving and smooth blasting can regulate the energy release process effectively, a staged and controlled energy release process is proposed to modulate the distribution and timing of strain energy dissipation, thereby reducing the risk of dynamic failure. This approach presents a novel method for managing rock burst tendencies in high-stress rock tunnel excavations.

在硬岩巷道开挖中，爆破被广泛应用，但爆破往往会使岩体力学性能恶化，在围岩中形成与能量演化相关的扰动区。在高应力环境下，这个扰动区有发生岩爆等工程灾害的危险。已有研究证实，优化能量释放过程是控制冲击地压的有效策略。本研究主要通过分析影响扰动区形成的参数来加强能量路径优化。具体而言，我们对崩落孔间距、崩落爆破荷载、光面爆破荷载、孔间距、光面爆破荷载等关键爆破参数进行了敏感性分析。通过探索不同设计条件下崩落和光面爆破的影响，提出了一种通过阶段性释放能量，逐步扰动围岩来控制岩爆的方法。结果表明，调整崩落和光面爆破扰动区可以有效调节能量释放过程，提出了一种分阶段可控的能量释放过程，可以调节应变能量耗散的分布和时间，从而降低动态破坏的风险。该方法为高应力岩巷道岩爆管理提供了一种新的方法。

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引用次数: 0

Recent advancements for cement grout diffusion mechanisms within rock fractures 岩石裂隙内水泥浆扩散机制研究进展

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-08-22 DOI: 10.1016/j.rockmb.2025.100237

Haizhi Zang, Shanyong Wang

Understanding cement grout diffusion in rock fractures is crucial for rock engineering, yet grouting faces significant challenges due to fracture network heterogeneity and grout's complex non-Newtonian rheology. This study critically reviews recent theoretical, experimental, and numerical advancements to comprehensively understand cement grout diffusion mechanisms within rock fractures. It begins by discussing theoretical foundations, encompassing both continuum and particulate views in single fractures, while also highlighting limitations in extending these simplified concepts to fracture networks and defining robust stop criteria. Subsequently, the article details developments in experiments, including novel apparatus and advanced monitoring techniques. These enable controlled observation of grout diffusion in artificial or simulated fractures, providing crucial insights into the impact of fracture complexities (e.g., fracture roughness, two-phase flow) on grout patterns and sealing efficiency. These laboratory tests also inform the development of practical stop criteria by revealing actual grout behaviour under various conditions. Complementary numerical methods offer a distinct advantage by providing dynamic, continuous solutions for complex fracture networks that are otherwise intractable. Collectively, these diverse approaches bridge critical knowledge gaps, from fundamental principles to real-world complexities, and facilitate cross-scale validation. The review concludes by identifying persistent challenges, such as integrating multi-scale descriptions and simulating true field complexities, and outlines future research directions to understand grout diffusion mechanisms.

了解水泥浆液在岩石裂缝中的扩散对岩石工程至关重要，但由于裂缝网络的非均质性和浆液复杂的非牛顿流变性，注浆面临着巨大的挑战。本研究批判性地回顾了最近的理论、实验和数值进展，以全面了解岩石裂缝内水泥灌浆扩散机制。首先讨论了理论基础，包括单个裂缝的连续体和颗粒视图，同时也强调了将这些简化概念扩展到裂缝网络和定义稳健停止标准的局限性。随后，文章详细介绍了实验的发展，包括新的仪器和先进的监测技术。这些技术可以控制观察人工或模拟裂缝中的浆液扩散，为裂缝复杂性（例如裂缝粗糙度、两相流）对浆液模式和密封效率的影响提供重要见解。这些实验室测试还通过揭示各种条件下实际的灌浆行为，为实际停止标准的制定提供信息。互补数值方法具有明显的优势，可以为复杂的裂缝网络提供动态、连续的解决方案。总的来说，这些不同的方法弥合了关键的知识差距，从基本原理到现实世界的复杂性，并促进了跨规模的验证。总结指出了持续存在的挑战，如整合多尺度描述和模拟真实的现场复杂性，并概述了未来的研究方向，以了解浆液扩散机制。

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引用次数: 0

Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodology 应用复变函数法综合求解煤层开采覆岩顶板应力演化

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-08-22 DOI: 10.1016/j.rockmb.2025.100236

Yinkai Li , Hongwei Wang , Zhanbin Zhu , Daixin Deng , Naisheng Jiang

Large-scale roof collapse is a major dynamic hazard threatening the safe coal mine operations. Understanding the deformation and failure characteristics of overburden rock strata, as well as deciphering the stress evolution mechanism of overburden rock structure in mining stopes, is of great theoretical advancement and engineering applications in roof disasters prevention. This study employs a theoretical derivation to systematically analyze the characteristics of overburden roof deformation and caving behavior during the coal seam mining. By modeling the trapezoidal caving zone in the overburden roof strata as a complex functional system, the stress distribution within the caving zone and adjacent intact strata was mathematically characterized. Stress evolution patterns of overburden strata at different caving stages were derived under both elastic and elastoplastic deformation conditions, accompanied by the demarcation of elastic-plastic zones. In addition, the critical length for the first caving and periodic caving of overburden are theoretically determined. To validate the proposed analytical framework, comprehensive numerical simulation and physical model tests are conducted to investigate the overburden roof caving characteristics during coal seam mining. Quantitative comparisons between experimental, numerical results and theoretical analyses were performed in terms of the caving range of roof strata, the critical length for the roof strata caving and stress distribution. The consistencies among different approaches confirms the reliability of the theoretical model, providing a robust foundation for optimizing mining designs and implementing effective roof control strategies.

大面积顶板坍塌是威胁煤矿安全生产的重大动力灾害。了解覆岩岩层的变形破坏特征，破译采场覆岩结构的应力演化机制，对顶板灾害防治具有重要的理论意义和工程应用价值。本文采用理论推导的方法，系统分析了煤层开采过程中覆岩顶板的变形和冒落特性。通过将覆岩顶板岩层中的梯形崩落带建模为一个复杂的功能系统，对崩落带及其相邻完整岩层内的应力分布进行了数学表征。推导了不同垮落阶段覆岩在弹塑性和弹塑性变形条件下的应力演化规律，并划分了弹塑性带。此外，从理论上确定了覆岩第一次崩落和周期性崩落的临界长度。为了验证所提出的分析框架，对煤层开采过程中覆岩顶板冒落特性进行了综合数值模拟和物理模型试验研究。在顶板垮落范围、顶板垮落临界长度及应力分布等方面，将实验结果、数值结果与理论分析进行了定量比较。不同方法之间的一致性证实了理论模型的可靠性，为优化采矿设计和实施有效的顶板控制策略提供了坚实的基础。

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引用次数: 0

Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodology 应用复变函数法综合求解煤层开采覆岩顶板应力演化

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-08-22 DOI: 10.1016/j.rockmb.2025.100236

Yinkai Li , Hongwei Wang , Zhanbin Zhu , Daixin Deng , Naisheng Jiang

Large-scale roof collapse is a major dynamic hazard threatening the safe coal mine operations. Understanding the deformation and failure characteristics of overburden rock strata, as well as deciphering the stress evolution mechanism of overburden rock structure in mining stopes, is of great theoretical advancement and engineering applications in roof disasters prevention. This study employs a theoretical derivation to systematically analyze the characteristics of overburden roof deformation and caving behavior during the coal seam mining. By modeling the trapezoidal caving zone in the overburden roof strata as a complex functional system, the stress distribution within the caving zone and adjacent intact strata was mathematically characterized. Stress evolution patterns of overburden strata at different caving stages were derived under both elastic and elastoplastic deformation conditions, accompanied by the demarcation of elastic-plastic zones. In addition, the critical length for the first caving and periodic caving of overburden are theoretically determined. To validate the proposed analytical framework, comprehensive numerical simulation and physical model tests are conducted to investigate the overburden roof caving characteristics during coal seam mining. Quantitative comparisons between experimental, numerical results and theoretical analyses were performed in terms of the caving range of roof strata, the critical length for the roof strata caving and stress distribution. The consistencies among different approaches confirms the reliability of the theoretical model, providing a robust foundation for optimizing mining designs and implementing effective roof control strategies.

大面积顶板坍塌是威胁煤矿安全生产的重大动力灾害。了解覆岩岩层的变形破坏特征，破译采场覆岩结构的应力演化机制，对顶板灾害防治具有重要的理论意义和工程应用价值。本文采用理论推导的方法，系统分析了煤层开采过程中覆岩顶板的变形和冒落特性。通过将覆岩顶板岩层中的梯形崩落带建模为一个复杂的功能系统，对崩落带及其相邻完整岩层内的应力分布进行了数学表征。推导了不同垮落阶段覆岩在弹塑性和弹塑性变形条件下的应力演化规律，并划分了弹塑性带。此外，从理论上确定了覆岩第一次崩落和周期性崩落的临界长度。为了验证所提出的分析框架，对煤层开采过程中覆岩顶板冒落特性进行了综合数值模拟和物理模型试验研究。在顶板垮落范围、顶板垮落临界长度及应力分布等方面，将实验结果、数值结果与理论分析进行了定量比较。不同方法之间的一致性证实了理论模型的可靠性，为优化采矿设计和实施有效的顶板控制策略提供了坚实的基础。

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引用次数: 0

A multi-frequency ultrasonic amplitude attenuation method for identifying damage of rock 一种用于岩石损伤识别的多频超声振幅衰减方法

IF 7

Rock Mechanics Bulletin

Pub Date : 2025-08-22 DOI: 10.1016/j.rockmb.2025.100238

Yiming Gu , Zhe Li , Yun Chen , Yuliang Zhang

High-temperature damage in rocks significantly affects ultrasonic amplitude attenuation. Inverting rock damage through amplitude attenuation offers a rapid, non-destructive, and convenient detection method. However, the single-frequency ultrasonic testing method, due to its single amplitude attenuation parameter and relatively large experimental error, is difficult to fully reflect the material's characteristics, ultrasonic flaw detection methods based on multi-frequency amplitude attenuation are relatively scarce. To address this, the study proposes a multi-frequency ultrasonic amplitude attenuation detection method, eliminating single-frequency measurement errors and accurately characterizing the attenuation behavior of thermally damaged rocks. Experimental results show that after high-temperature treatment, P-wave amplitude attenuation increases progressively with frequency (by 50%), whereas S-wave attenuation first decreases and then rises. A correlation model between amplitude attenuation and damage variables was established, confirming that P-wave attenuation effectively quantifies rock damage. The study initially explored the interaction mechanism between multi-frequency ultrasonic and fractures: low-frequency waves exhibit increased attenuation due to boundary reflections, while high-frequency waves show enhanced attenuation as diffraction effects weaken. These findings bridge a critical gap in multi-frequency amplitude attenuation research and provide a scientific basis for identifying high-temperature damage in rocks.

岩石高温损伤对超声振幅衰减有显著影响。通过幅值衰减反演岩石损伤提供了一种快速、无损、方便的检测方法。而单频超声探伤方法由于其幅度衰减参数单一，实验误差较大，难以充分反映材料的特性，基于多频幅度衰减的超声探伤方法相对较少。针对这一问题，本研究提出了一种多频超声振幅衰减检测方法，消除了单频测量误差，准确表征了热损伤岩石的衰减行为。实验结果表明，高温处理后，纵波振幅衰减随频率增加而逐渐增大（衰减幅度为50%），而s波衰减先减小后增大。建立了振幅衰减与损伤变量的关联模型，证实了纵波衰减能有效量化岩石损伤。本研究初步探讨了多频超声与裂缝的相互作用机制：低频波由于边界反射的作用衰减增大，高频波由于衍射效应减弱衰减增强。这些发现弥补了多频振幅衰减研究的重要空白，为识别岩石高温损伤提供了科学依据。

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