含断层煤层底板突水通道形成过程的仿真分析  

NUMERICAL ANALYSIS OF PATHWAY FORMATION OF GROUNDWATER INRUSH FROM FAULTS IN COAL SEAM FLOOR

作　　者：李连崇[1] 唐春安[1] 梁正召[1] 马天辉[1] 张永彬[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116024

出　　处：《岩石力学与工程学报》2009年第2期290-297,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2007CB209404);国家自然科学基金重点项目(40638040)

摘　　要：基于对断层形态、产状要素、力学性质复杂性及断层诱发突水机制的认识,针对承压水上采煤的含断层岩体水力学模型,通过有限元数值仿真再现了含断层煤层开采底板采动裂隙形成、断层活化到突水通道形成的全过程。通过对损伤演化、应力场和渗流场的解读,揭示开采扰动及水压驱动下完整底板由隔水岩层到突水通道的演化机制。数值分析结果显示:断层本身的物理力学性质及断层的产状要素,包括断距和倾角等,对煤层底板的相对安全性都具有重要的影响。最后结合现场地质、水文地质调查及数值仿真结果对一工程实例进行突水机制分析,为承压水上采煤底板突水的机制分析及防治提供一些新的认识。Based on the knowledge of faults configuration, the complexity ofphysico-mechanical parameters of faults, and the mechanism of groundwater inrush induced by faults, numerical tests with FEM are conducted to investigate the initiation of fractures, activation of faults and formation of groundwater inrush pathway with mechanical model for rock mass with faults in coal mining above confined aquifer. With the understanding of damage evolution, stress field and seepage flow field, the transformation of floor rock mass from water-resisting strata to inrush pathway is clearly illuminated; and the groundwater inrush pathways are calibrated. It is shown that both mechanical characteristics and geometrical configuration, including dipping angle and interval of faults, have an important influence on groundwater inrush. Finally, based on geological, hydrogeological surveys and numerical results, the mechanism analysis of groundwater inrush in an engineering case is studied so as to provide significant meaningful guides for the investigation on mechanism and prevention of groundwater inrush in practice.

关 键 词：工程地质 数值模拟 断层 底板突水 突水通道 承压含水层 

分 类 号：P642[天文地球—工程地质学] O241[天文地球—地质矿产勘探]