Abstract:
In order to solve the problems of severe mining pressure during the final mining of fully mechanized mining face in Jinjie Coal Mine, large deformation of surrounding rock in the withdrawal channel and difficult to control, based on the background of 31115 working face mining in Jinjie Coal Mine, a combination of theoretical analysis and numerical calculation was used to study the overburden instability movement form, surrounding rock stress distribution law, roadway deformation law and surrounding rock stability control technology in the final mining section of fully mechanized mining face with double retraction passage. The stress transfer techniques, such as stoping concession pressure and forced caving, are proposed based on controlling the position of the basic roof of overburden. The results show that the basic roof instability of working face can be divided into sliding instability and rotary instability, and the regional stress concentration caused by rotary instability is greater than that caused by sliding instability; when the working face advances to 10 m before connecting with the main drawback channel, the main drawback channel is obviously affected by the mining of the working face, and the regional stress concentration increases with the narrowing of the width of the coal pillar between the working face and the main drawback channel. The relevant control measures taken are effective.