ANALYSIS OF NUMERICAL SIMULATION METHOD FOR PALEO-TECTONIC STRESS FIELD
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摘要:
从构造模拟目标、构造模型建立、构造模拟三个方面探讨了古构造应力场数值模拟的方法。以山西省晋城成庄煤矿区为例, 根据野外调查和微观构造形迹, 建立平面应力模型和三维地质模型, 确定岩体力学参数、边界条件及岩石破裂准则, 采用大型数值模拟软件ANSYS和FLAC计算, 确定外力的大小及加载顺序。通过分析研究, 揭示了山西晋城成庄煤矿区历史上曾发生先东西向、后南北向的两期大的构造运动, 加载外力为先东西向加载60 MPa, 再南北向加载110~180 MPa, 这个结果能解释多数地表剪节理和3#煤中剪节理同时发生。该分析对矿区的危险性分区及瓦斯突出区的预测具有重要的意义。
Abstract:This paper analyses the numerical simulation method for Paleo-tectonic Stress Field from three aspects, namely tectonic simulation target, building of the tectonic model and tectonic modeling. Taking Chengzhuang coal mine, Jincheng City of Shanxi Province as an example, and based on field investigation on macro- and micro-tectonic features, the authors have established a plane-strain and three-dimension geological model, and obtained the mechanics parameters and fracture criterion of rock and boundary condition of the model. Using the large numerical simulation analysis software such as ANSYS and FLAC, they have determined the magnitude of palaeo-tectonic stress as the boundary condition of model and the loading sequence of palaeo-tectonic stress. The simulation results reveal two stages of large tectonic movement in the study area, the first movement in E-W and then another in N-S. Accordingly, a tectonic stress of 60 MPa was imposed in E-W deirection and 110 MPa in N-S direction. The acting pattern of the stress caused the simultaneous appearance of most shear joints on the earth surface and in the 3# coal rock. These rules not only offer important reference for understanding of deep condition of coal and the gestation condition of move fault in coal, but also have great significance for prediction of coal and gas outburst in stress concentration area of rock mass.
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Key words:
- Paleo-tectonic Stress /
- tectonic simulation /
- plan- strain /
- shear joint
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