岩体循环加卸载力学特性对完整底板导水通道演化影响研究

doi:10.13722/j.cnki.jrme.2016.0987

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Abstract

The focus of prevention and control of water inrush from floor is to study the evolution of the intact floor from aquifuge to water-conducting. According to the elastic stiffness variation characteristics of floor rock mass in mining process，which beard loading of compression-tension-compression，using double scalar D-P elastoplastic damage constitutive model，finite element model was built based on the engineering geological conditions of Chengzhuang mine，the evolution law of water-conducting was analyzed in working face advancing process. The main conclusions are as follows：(1) Compression and tensile damage zones exist in mining floor. Compressive and tensile damage zones lead and lag coal wall respectively，both of them are connected，forming a water-conducting，which is inclined to pass through the plane of the coal wall. (2) Floor damage depth increases with the increase of the roof hanging area，and leads to the fracture depth increases again in last calculation step. Under the influence of filling body，the growth rate of the floor compression damage depth at the position of the coal wall is rapidly decreasing(the first roof caving)，and finally reaching stability(the periodic caving). (3) Floor failure depth will rapid increase if elastic modulus of filling body is too low. Under the action of the filling body，the tension crack closure and the elastic stiffness of floor rock mass are restored，permeability of rock mass is decreased at the same time. The monitoring results obtained from the water injection experiment are in agreement with the numerical simulation results.

Key words： rock mechanics cyclic loading and unloading elastoplastic damage constitutive model water conducting channel delayed coal wall water injection experiment

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0987 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3470

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