Research On Mining-induced Water Resisting Property Of Clay Aquiclude In Shallow Seam

The Clay Aquiclude's Mining-induced water resisting property of shallow seam has been studied in details through physical simulation experiment and numerical simulation experiment on base of the analysis and research on the geography of Yushenfu mining field. The research is staked by my supervisor & professor Huang Qingxiang's item sponsored by natural science education fund of country (Study on the Character of Surface Aquiclude in Shallow Seam) and so on, which is significant in theory to protect environment, provide some scientific basis and reference for water conversation mining.The permeability and expansion of original clay and recomposed clay has been researched by mechanic experiment. The Clay aquiclude's changing regularity with head pressure, saturation and time is acquired, which provide basis for studying its Mining-induced water resisting property. On the geography of Yushuwan mining field, then through physical simulation experiment, the simulation materials are proved right. The relation of the cracks'height and mining areas, the distribution of cracks and fissure close features are acquired. The descending cracks which are on the top of open-off cut and working face are principal channel of the subwater infiltrating are confirmed. It found that except mining-induced influencing descending crack'development, the Clay aquiclude'expansion and water softening are principal factor which reduced descending crack development and closing. Applying numerical simulation program FLAC to simulate the progress of the mining in longwall mining and analyse overburden'stress-strain field with different mining-induced factor, the distribution of cracks and its stress-strain field are proved further.The Clay aquiclude's mining-induced water resisting property is the key factor whether realize water conversation mining. On the basis of research, bedrock movement is the principal factor which influence ascending crack'development; Clay aquiclude'water property is the principal factor which influence descending crack'close. The relationship of ascending crack and descending crack decide Clay aquicldue's water resisting stability. On the basis of clay's permeability and expansion, the Blurry and Synthetical Estimation of clay aquiclude's fissure close is acquired, which promoted some theoretical support for the clay aquiclude's mining-indeced property. At last, on the principal factor which affects Clay aquiclude's mining-induced water resisting property, provided some measures of water conversation mining.