基于断层封闭性与数值模拟的断层导水性综合评价

    Comprehensive evaluation of fault hydraulic conductivity based on fault sealing and numerical simulation

    • 摘要: 基于三河口煤矿一采区3107工作面钻探、物探以及巷道揭露断层资料,对天然状态下三河口断层与前寨断层含水性进行了分析,并使用岩性并置图、SGR法和断层面正压力法等断层封闭性方法从侧向和垂向2个方面对天然条件下断层导水性进行了评价,并对工作面采动条件下断层渗流特征及活化规律进行了数值模拟研究。结果表明:三河口断层与前寨断层在天然条件下均为不含(导)水断层,且在距三河口断层30 m、距前寨断层26 m的条件下进行工作面开挖时,两断层内孔隙水压力增长缓慢,且仅断层上端较小范围内发生破坏,断层整体阻水性能未发生变化。

       

      Abstract: Based on the data of drilling, geophysical exploration and roadway fault exposure of No.3 upper 107 working face in first mining area of Sanhekou Coal Mine, the water bearing capacity of Sanhekou fault and Qianzhai fault in natural state is analyzed, and the fault sealing methods such as lithology juxtaposition map, SGR method and fault plane normal pressure method are used to evaluate the fault water conductivity in natural conditions from lateral and vertical aspects. The numerical simulation of fault seepage characteristics and activation law under the condition of mining in working face is carried out. The results show that both Sanhekou fault and Qianzhai fault are water free faults under natural conditions. When the working face is excavated 30 m away from Sanhekou fault and 26 m away from Qianzhai fault, the pore water pressure in the two fault layers increases slowly, and only the upper end of the fault is damaged within a small range, and the overall water blocking performance of the fault does not change.

       

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