采动影响下等效连续介质水岩耦合数学模型及应用  

An equivalent porous media water-rock coupling model impacted by coal mining and its application

作　　者：白国良[1] 梁冰[2] 李树志[1] 

机构地区：[1]煤炭科学研究总院唐山研究院,河北唐山063012 [2]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《煤炭学报》2009年第4期461-465,共5页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50574048);“十一五”国家科技支撑计划重点资助项目(2006BAC09B01)

摘　　要：为研究采动影响下含水层渗流场演化规律,推导了以应变为参数的裂隙岩体等效渗透系数,基于B iot固结理论建立了等效连续介质水岩耦合数学模型,采用快速拉格朗日有限差分进行了数值模拟.研究结果表明:裂隙是采动岩体渗流的主要通道;煤层开采初始阶段岩体渗透性增加区域在底板呈"W"形分布,在顶板岩体渗透性增加区域呈"M"形分布;当含水层渗透性增加区与下方顶板渗透性增加区相交时,形成导水裂隙;在渗透性增加区内岩体形成了相对"膨胀区",而在渗透性降低区内岩体产生被压缩的现象.In order to research the aquifer seepage field evolutional law impacted by coal mining, an equivalent porous media conductivity for fracture rock mass was deduced, in which the strain was considered as the parameter, and an equivalent porous media water-rock coupling numerical model was developed basing on Blot consolidation theory, and the fast Lagrange finite difference method was used in the numerical simulation. The results indi- cate that the fracture is the main channel where the groundwater goes through, the increasing permeability zones induced by coal mining has the shape of ＂M＂ in the roof and ＂W＂ in the floor at the initial excavating stage, the conductive fractures are formed when the two increasing permeability zones intersect between the aquifer and the roof and the water permeates to the gob. The relative ＂dilating zones＂ are formed in the increasing permeability zones of the rock, at the same time, the compressed phenomena is appeared in the decreasing permeability zones.

关 键 词：采动影响 等效连续介质 水岩耦合 裂隙岩体 渗透性 

分 类 号：TU457[建筑科学—岩土工程]