Study on water resisting property of subsurface aquiclude in shallow coal seam mining
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摘要:
According to the characteristic of clay aquiclude of overburden, the propersimulation materials and proportions of mixture for simulating the plastic clay aquicludelayers were developed, and the plastic similarity conditions were setup. Thus, the simili-tude and simulation method in whole stress-strain was progressed. Furthermore, thesimulation condition and material proportions in water reaction property and crack closingproperty were also put forward. Based on systematical tests, the development and distri-bution of mined cracks in roof and subsurface aquiclude was found and the stability ofaquiclude was analyzed at all. At last, the key section and key index of aquclude stabilitywas advanced. It is found that the movement of clay aquiclude follows the movement ofthe underlying bedrock layers. The basic caving mechanism of the overburden roof stratawas also presented.