采动影响下陷落柱渗流特征分析  

Seepage Characteristics of Collapse Column under the Influence of Mining

作　　者：欧苏北[1,2] 王连国[1] 

机构地区：[1]深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]中国矿业大学力学与建筑工程学院,江苏徐州221008

出　　处：《煤矿安全》2012年第3期154-157,共4页Safety in Coal Mines

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB226805);国家自然科学基金资助项目(50874103);江苏省自然科学基金资助项目(BK2008135)

摘　　要：为了研究工作面靠近过程中,陷落柱内应力的变化规律及其影响下陷落柱的渗流特征,基于FLAC3D流固耦合模型,建立了2种数值分析模型,对比分析了工作面附近应力变化对陷落柱的应力场以及渗流场的影响,结果显示:陷落柱先后处于工作面超前支撑压力和卸荷区范围内,导致其应力先增大后减小,从而引起渗流场的变化;承压水在陷落柱内逐渐消耗,水头处压力为0;陷落柱贯穿煤层较隐伏于底板下,工作面距含水层更近,柱体受采动影响大,水头发育较高,实际工程中应加强这种情况下的监测和防范。To study the change laws of stress and the seepage characteristics under the influence of the stress with the mining face closes to the collapse columns, two numerical models were established based on FLAC3D fluid - solid coupling model, and the impact of the stress changes near the working face on the stress field and seepage field of the collapse columns were analyzed. The results showed that the collapse column successively laid in the areas of advanced support pressure zone and unloading zone, which led to its stress first in- creased and then decreased, thus caused the changes of seepage field. Water decreased in the collapse column, and pressure of the water head was 0. Compare to the collapse column which hidden under the floor, when the collapse column penetrated the coal, the workface was closer from the aquifer and mining had a greater impact on the collapse column, then the water head grew higher. Actual proiect should strengthen monitoring and prevention for this case.

关 键 词：陷落柱 采动影响 渗流场 应力场 流固耦合 

分 类 号：TD32[矿业工程—矿井建设]