基于不同岩层组合对底板阻水效应的流固耦合机理研究  

Study on fluid- solid coupling mechanism for water resistance effect of coal floor based on different combination of rock strata

作　　者：翟晓荣[1] 张红梅[1] 窦仲四[1] 吴基文[1] 沈书豪 周盛全 

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《中国安全生产科学技术》2016年第7期16-21,共6页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(41272278);安徽高校自然科学重点项目;矿山地质灾害防治安徽省重点实验室项目(KJ2016A826);安徽省高校自然科学基金项目(KJ2016SD19)

摘　　要：为了探究不同岩层组合底板对承压水的阻隔效果,以淮北矿区下组煤底板为研究对象,建立了三种不同组合特征底板模型。基于FISH语言对FLAC3D软件进行二次开发,对流固耦合条件下不同组合特征底板采动应力及围岩渗透性进行了综合分析。结果表明:流固耦合条件下,底板采后应力转换点深度较不考虑底板水压条件下加深,且底板深部出现了明显的卸压现象;硬软型底板采后卸荷程度及应力转换点降幅最大,而软硬相间型底板受最小;硬软型底板采后渗透性提高4.5倍,而软硬相间型底板仅提高1.4倍,研究结果揭示出软硬相间岩层组合底板阻水效果最好,而硬软型底板最差。To investigate the resistance effect of coal floor with different combination of rock strata on confined water , taking the coal floor of lower coal group in Huaibei mining area as research object , three coal floor models with different combination characteristics were established .The secondary development was conducted on FLAC 3D software based on FISH language , then the comprehensive analysis on the mining stress of coal floor and the permeability of surrounding rock with different com -bination characteristics under the condition of fluid-solid coupling was carried out .The results showed that under the condi-tion of fluid-solid coupling , the depth of stress transition point for coal floor after mining was larger than that without consid -ering the condition of floor water pressure , and the obvious pressure relief phenomenon appeared in the deep floor .The de-creasing amplitude of unloading degree and stress transition point for hard -soft type coal floor after mining were the largest , while those for alternated soft-hard type coal floor were the smallest .The permeability of hard-soft type coal floor after mining increased by 4.5 times, while that of alternated soft-hard type coal floor increased by 1.5 times only.It revealed that the wa-ter resistance effect of coal floor by the combination of alternated soft -hard rock strata is the best , while that by the hard-soft type coal floor is the worst .

关 键 词：流固耦合 煤层底板 阻水 FLAC3D 

分 类 号：X937[环境科学与工程—安全科学]