Study on numerical simulation of gas eission regularity and boundary condition of the goaf in coal caving of the fully-mechanized

Using computer numerical simulation of finite element combing with technology graph display to solve the gas seepage diffusing equation of two dimensional wandering field in goaf of full mechanized top coal caving. Through the tableau that audio visal describe the gas gush during the press under roof coal caving and its describe dynamic changing process under top coal caving simulation boundary. Disscussed the technical measures that determine to protect dissallowed gas concentration in the face of full mechanized top coal caving through simulation experiments. Combing with concrete calculation example it expounds installing moving and adjustment windbreak in face and using the work form of "double nine one six" to decline the coal caving strength of reture air,so as to control that the coal caving gas mass burst into face.