浅埋近距煤层覆岩导水裂隙发育规律固液耦合试验研究  

Fluid-solid Coupling Experiment Research on Water Flowing Fracture Development Laws in Overburden Rocks of Shallow Buried Short-distance Coal Seams

作　　者：金志远[1] 赵小英[2] 马立强[3,4] 许猛堂[1] 

机构地区：[1]贵州理工学院矿业工程学院,贵州贵阳550003 [2]贵州理工学院工程实训中心,贵州贵阳550003 [3]中国矿业大学矿业工程学院,江苏徐州221116 [4]中国矿业大学深部煤炭资源开采教育部重点实验室,江苏徐州221116

出　　处：《煤矿安全》2016年第9期32-34,38,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(2015CB251600);贵州省科学技术基金资助项目(黔科合J字[2015]2072号);贵州省教育厅自然科学研究资助项目(青年项目)(黔教合KY字(2015)427号)

摘　　要：为弄清浅埋近距煤层采动覆岩导水裂隙发育规律,设计了固液耦合相似模拟试验,分析了浅埋近距煤层开采过程中覆岩导水裂隙发育规律及隔水层弥合特征。下煤层开采过程中,浅埋近距煤层上煤层开采后已压实稳定的覆岩导水裂隙会二次发育,不同开采区域的覆岩导水裂隙发育程度不同。采动隔水层裂隙发育与其遇水膨胀是同步动作的。开采边界的隔水层裂隙在上煤层开采过程中遇水膨胀后能够弥合,在下煤层开采过程中由于遇水膨胀能力不足而无法弥合。采空区中部的隔水层裂隙在岩层回转挤压和隔水层遇水膨胀共同作用下能够弥合。In order to find out the mechanism of water flowing fracture development in overburden rocks of shallow buried short - dis- tance coal seams, the solid - liquid coupling simulation experiment has been designed to analyze the mechanism during mining and the healing features of the water - resisting layer. In the mining process of lower coal seam, the water flowing fractures, which have been compacted steadily after the mining of upper coal seam in overburden rocks, will regenerate with different levels in different mining re- gions. The fractures＂ development and its water swelling in mining - induced water - resisting layer is synchronised to each other. Frac- tures in the mining boundary of water - resisting layer can heal under the influence of water swelling while the upper coal seam is mined. By the contrast, fractures in lower coal seam can not heal due to the lack of water swelling capacity. Fractures in the middle of water - resisting layer of goaf can heal under the mutual function of rock rotary extrusion and the swelling of water - resisting layer.

关 键 词：浅埋近距煤层 导水裂隙发育规律 固液耦合 弥合特征 

分 类 号：TD741[矿业工程—矿井通风与安全]