State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University
Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Shenzhen University
Institute of Deep Earth Scienc-es and Green Energy, Shenzhen University
Institute of Rock Instability and Seismicity Research, Dalian University of Technology

煤矿巷道的力学性质由围岩结构决定,结构面位置、抗拉强度等特征显著影响应力波在围岩中的传播规律。以青砂岩为研究对象,通过室内试验分析了含低应力波透射性结构面围岩破坏特征,借助ABAQUS/Explicit建立含高应力波透射性结构面围岩数值模型,并结合室内试验结果验证模型合理性,同时对不同高透射性结构面抗拉强度、位置、入射波幅值等条件下整体巷道围岩破坏特征进行研究。研究结果表明:随着结构面抗拉强度的增加,低应力波透射性结构面围岩层裂体长度逐渐缩短,高应力波透射性结构面的层裂体长度则与结构面抗拉强度无关。高应力波透射性结构面围岩在应力波作用下围岩先于结构面破坏,低应力波透射性结构面围岩中结构面先于围岩破坏的模式。巷道围岩中高应力波透射性结构面距自由端较远时不影响围岩层裂位置,距自由端较近时仅结构面破坏。随着应力波幅值的增加,高应力波透射性结构面围岩破坏模式依次为:整体未破坏、围岩完整–结构面拉伸破坏、围岩层裂破坏–结构面拉伸破坏。研究结果可为巷道的稳定性评价提供参考。

The mechanical characteristics of the structural plane are determined by surrounding rock structure, the location and tensile strength of the structural plane significantly affect the propagation of stress waves in rocks. In this research, sandstone was used as the research object, and laboratory experiments were used to analyze the fail-ure characteristics of the surrounding rock with low stress wave transmission structural planes. The ABAQUS/Explicit numerical model of the surrounding rock with high stress wave transmission structural planeswas established, and The results of the experiment were used to verify the model's reasonability. The failure char-acteristics of the overall chamber's surrounding rock under different conditions of high transmission structural plane tensile strength, position, and incident wave amplitude were studied. The results are as follows: With the increase of the tensile strength of the structural plane, the length of the surrounding rocks’ spallation with low stress wave transmission structural planes gradually decreases, while the spall length of the high stress wave transmission structural planes is irrelevant to the tensile strength of the structural plane. The surrounding rock with high stress wave transmission structural planes often fails before the structural plane under the disturbance of stress waves, which is different from the mode that the structural plane fails before the surrounding rock in the experiment of rock bars with low stress wave transmission structural planes. When the high stress wave transmis-sion structural plane is far away from the free end in the chamber's surrounding rock, it does not affect the loca-tion of spallation. When it is close to the free end, only the structural plane fails. With the increase of stress wave amplitude, the failure modes of surrounding rock with high stress wave transmission structural planes are: no fail-ure, intact surrounding rock – structural plane tensile failure, and surrounding rock spalling failure – structural plane tensile failure. The results are important for the safety and stability of underground chambers.

国家重点研发计划资助项目(2022YFC3004602);国家自然科学基金资助项目(52325404);珠江人才计划引进创新创业团队资助项目(2019ZT08G315);深圳市基础研究资助项目(JCYJ20220818095605012);深圳大学2035卓越研究计划资助项目(2022B001)

1 试验方案设计
2 不同结构面抗拉强度影响规律
3 数值模拟
3.1 数值模型建立
3.2 对比验证
3.2.1 完整围岩验证
3.2.2 含低应力波透射性结构面围岩验证
4 高应力波透射性围岩层裂特性数值模拟
4.1 结构面抗拉强度对层裂的影响
4.2 不同应力波对层裂的影响
4.3 结构面位置对层裂的影响
5 讨论
6 结论

朱建波, 毕硕, 孙家鑫, 等.动荷载作用下不同应力波透射性结构面围岩层裂特性[J]. 采矿与岩层控制工程学报, 2024, 6(1): 013035.

ZHU Jianbo, BI Shuo, SUN Jiaxin, et al.Spallation characteristics of surrounding rock with structural planes with different stress wave transmittance under dynamic load[J]. Journal of Mining and Strata Control Engineering, 2024, 6(1): 013035.