煤层底板下隐伏陷落柱的滞后突水机理  

Mechanism of hysteretic groundwater inrush from coal seam floor with karstic collapse columns

作　　者：李连崇[1] 唐春安[1] 左宇军[2] 李根[1] 刘超[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116024 [2]大连大学材料破坏力学数值试验研究中心,辽宁大连116622

出　　处：《煤炭学报》2009年第9期1212-1216,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)基金资助项目(2007CB209404);国家自然科学基金资助项目(50820125405);国家自然科学基金资助项目(50674025)

摘　　要：应用有限元数值计算方法,模拟研究了含隐伏陷落柱煤层底板在采动应力扰动和高承压水共同作用下陷落柱活化、裂隙萌生、裂隙扩张、突水通道贯通形成的全过程,通过对损伤场、变形场、应力场和渗流场的解读,对突水通道进行时空基准标定,并就陷落柱发育高度、承压水水压力大小对突水滞后时间的影响进行了分析探讨,从岩体在长期的环境影响、载荷作用下损伤演化、物理力学性能退化的角度,揭示了煤层底板下隐伏陷落柱的滞后突水机理.Numerical simulation with FEM method was conducted to investigate the activation of karstic collapse columns. The initiation of fractures, propagation of fractures and formation of groundwater inrush pathway in coal seam floor were numerically obtained. With the understanding of damage, deformation, stress and seepage flow evolution in rock mass, the groundwater inrush pathways were calibrated. Furthermore the influence of the height of karstic collapse columns and the magnitude of water pressure on the delayed time of groundwater inrush was studied. With the point of view of damage evolution and associated mechanical properties degradation of rockmass subjected to long-term environmental effect and loading, the transformation of floor rock mass from water-resisting strata to inrush pathway was clearly illuminated.

关 键 词：陷落柱 滞后突水 损伤 承压水 突水通道 

分 类 号：P642.25[天文地球—工程地质学] TD745[天文地球—地质矿产勘探]