SIMULATION STUDY OF THE TECTONIC STRESS FIELD IN MINES———A CASE STUDY OF THE BAODIAN COAL MINE
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摘要: 通过物理实验和数值模拟分析了岩体断裂变形过程和破坏的形态特征, 总结了岩体破坏过程的规律, 并推广到中小型构造变形, 认为地质体中的应力差达到或超过岩体强度极限时, 地质体首先从高应力差区域产生破裂, 破坏面走向近似平行于高应力差等值线。在矿井地质条件分析和岩组分析的基础上, 根据岩体破坏过程的规律, 以鲍店矿为例分析了燕山期矿井构造的外力作用方式和方向, 通过对比分析验证了矿井构造的序次, 揭示了矿井构造演化的过程。Abstract: By physical experiments and numerical simulation, the ruptural deformation process and failure morphological features of rock masses were analysed.The rule in the course of rock mass failure deformation was summarized.The rock mass with homogeneous lithologic character can be treated as isotropy on a macroscopic scale. The defects existing in a geologic body naturally such as holes, fissures and bedding planes make the stress in a geologic body distributed unevenly. Rupture first takes place in a high stress difference area of the geologic body when the stress difference reaches or exceeds the ultimate strength. The failure deformation will continue with increasing tectonic stress and the strike of failure planes is approximatively parallel to the high-stress difference isolines. Based on an analysis of mine geologic conditions and tectonite fabrics, according to the rule in the course of rock mass failure deformation, the mode and direction of action of external force for the Yanshanian structures in the mines are analyzed by taking the Baodian coal mine for example.By comparative analysis, the sequence of formation of structures in the mine is validated, and the evolution of mine structure is revealed.
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Key words:
- rock mass /
- failure criterion /
- mine structure /
- stress field /
- simulation
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图 1 不同边界条件下, 试块的抗压实验结果
Figure 1. Results of compression strength tests on specimens under different boundary conditions
图 2 不同边界条件下, 试块受荷后应力差(σ1-σ3)等值线(单位:×10MPa)
Figure 2. Isolines of stress difference (σ1-σ3) of specimens under loads under different boundary conditions (unit:×10 MPa)
图 3 试块1受荷后裂缝形成过程示意图
Figure 3. Generation process of fissures of specimen 1 under loads
图 6 鲍店矿构造岩样品石英光轴岩组图
Figure 6. Quartz optic axis fabric diagram of tectonite samples in the Baodian coal mine
图 7 鲍店井田燕山期构造应力场模拟分布图(单位: MPa)
Figure 7. Distribution of the simulated Yanshanian tectonic stress field in the Baodian well field
图 8 鲍店井田燕山期假定的构造应力场分布图(单位:MPa)
Figure 8. Distribution of the assumed Yanshanian tectonic stress field in the Baodian well field
表 1 鲍店井田部分断层一览表
Table 1. Summary of some faults of the Baodian coal mine
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