运用RFPA^(2D)数值模拟开采条件下的渗流通道  

NUMERICAL SIMULATION OF SEEPAGE CHANNEL WITH REPA^(2D) UNDER COAL MINING CONDITIONS

作　　者：刘俊杰[1] 陈雄[1] 张后全[2] 唐春安[1] 

机构地区：[1]大连大学材料破坏力学数值试验研究中心,辽宁大连116622 [2]东北大学岩石破裂与失稳研究中心,辽宁沈阳110004

出　　处：《岩石力学与工程学报》2005年第9期1522-1526,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：辽宁省教育厅高等学校科研项目计划 A 类(2004B004)

摘　　要：以煤矿相继地下采动造成阜新矿区八家子自然村民井断水现象为例,在对地下开采条件下水资源流失机理进行水文地质学定性分析的基础上,运用二维岩石破裂渐进过程分析系统,数值模拟了采场覆岩应力场的变化与重新分布规律,数值模拟结果再现了采动区覆岩裂隙萌生、扩展和贯通的过程;这个过程也是地下水渗流场变化与调整、地下水沿新生裂隙通道向地下开采负空间渗流的过程。二维岩石破裂渐进过程分析系统数值模拟结果与水文地质学定性分析结果吻合,证明该系统是一种能预测并预算采动裂隙生成、扩展及其相关危害(如地下水流失等)的可靠的数值定量分析方法。模拟结果表明,即使采空区和受影响区处于不同的水文地质单元,也会因地下采动影响形成畅通的渗流通道而改变地下水的径流方向和方式,为水的流失和向深部采空区渗流汇集创造便利的水文地质条件,使原来不具备渗水条件的采场成为可以接纳很大渗流量的地下水库。Water-break phenomena occur in some wells in Bajiazi Village, Fuxin Coalfield because of coal mining. The conditions of this case are employed. The hydrogeology qualitative analysis on the groundwater loss mechanism induced by underground mining is carried out. Then numerical simulation is performed with the rock failure process analysis (RFPA2D) code. The change and redistribution of the stress field of the rocks around the stope are studied, and the process from initiation, propagation, and coalescence to rupture of rock crannies around the stope is reproduced. The process shows the transformation and adjustability of the groundwater seepage action and the course of the groundwater leakage to the goaf through the crack. The results of numerical stimulation are consistent with the result of the hydrogeology qualitative analysis, which proves that REPA2D is one of the credible numerical quantitative analysis method to forecast the cranny's initiation, propagation, and other hazards(such as the groundwater runoff in this paper). The results of numerical stimulation show that although the goaf and influenced area are in different hydrogeological unit, the groundwater seepage channels are influenced by mining, which provide a favorable hydrogeological condition for the water runoff and accumulation to deep goaf, and make the stope that originally do not possess leakage conditions into a reservoir that can take up prodigious seepage.

关 键 词：水文地质 地下采动 地下水流失机理 渗流通道 数值模拟 

分 类 号：P641[天文地球—地质矿产勘探]