摘要
According to the characteristic of clay aquiclude of overburden,the proper simulation materials and proportions of mixture for simulating the plastic clay aquiclude layers were developed,and the plastic similarity conditions were setup.Thus,the simili- tude and simulation method in whole stress-strain was progressed.Furthermore,the simulation condition and material proportions in water reaction property and crack closing property 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 of aquiclude was analyzed at all.At last,the key section and key index of aquclude stability was advanced.It is found that the movement of clay aquiclude follows the movement of the underlying bedrock layers.The basic caving mechanism of the overburden roof strata was also presented.
According to the characteristic of clay aquiclude of overburden, the proper simulation materials and proportions of mixture for simulating the plastic clay aquiclude layers were developed, and the plastic similarity conditions were setup. Thus, the similitude and simulation method in whole stress-strain was progressed. Furthermore, the simulation condition and material proportions in water reaction property and crack closing property were also put forward. Based on systematical tests, the development and distribution of mined cracks in roof and subsurface aquiclude was found and the stability of aquiclude was analyzed at all. At last, the key section and key index of aquclude stability was advanced. It is found that the movement of clay aquiclude follows the movement of the underlying bedrock layers. The basic caving mechanism of the overburden roof strata was also presented.
基金
the National Natural Science Foundation of China(50375026)
the Key Program of Science and Technology of the Ministry of Education of China(204183)
the Program for New Century Excellent Talents in University of China(NCET-04-0971)
