Research On Aquiclude's Broking Law Of Longwall Mining In Shallow Seam

Practice and theory study in shallow seam indicate that the rich diving drains seriously which exists in thick sand layers,and it could be a danger to the production of coal mining if the the water and sand fluid into face. The study on bursting disaster has carried a lot, but research about the mechanism of diving draining andthe contrary environment effect carried seldom. In this paper, new experimental material is developmented in view of the flexible clay aquiclude based on field testing.On the basis of 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 also the item sponsored by ministry of education of shaanxi province(Study on the Mechanism of Diving Draining in Shallow Seam Mining Covered with Thick Sand Layers),the aquiclude's broking law of longwall mining in shallow seam has been studied in details through physical simulation experiment and solid-liquid coupling experiment with methods as following: analysis and numerical simulation.The developmentation of new material in physical simulation experiment and its allocated proportion rules realied the simulation of field project about the flexible rock layers.And through experimrnts,the material and the rouls are confirmed correct and reliable.Also the development distribution law of leading cracks is found,in which that the whole stratum has been divided into three parts,when the key factors that influence aquiclude's broking are confirmed.At the same time, the liquid-solid coupling experiment acted the procession of diving draining,which makes a progress on subject of physical simulation experimental reseach.The clay aquiclude is confirmed to be the key factor which determines if the diving drains by analysis of theory and the leading crack's highth.At last,the conslusions are confirmed by numerical simulation and fieled reseach on Yushuan Coal Mine.