Floor failure characteristics of fully mechanized mining face under influence of natural gas drilling
The existence of abandoned natural gas drilling will lead to changes in the failure characteristics of the floor dur-ing the mining process of the working face,and mining will also cause the failure of the sealing structure of the abandoned natural gas drilling,increasing the possibility of natural gas escaping to the working face.In this paper,a numerical simula-tion study is carried out in the abandoned natural gas drilling on the 5-20111 working face of Qinglongsi Coal Mine.The variation law of vertical displacement and failure depth of floor under the influence of natural gas drilling was analyzed.The influence of mining on the sealing structure of abandoned natural gas drilling was studied.The research results show that un-der the influence of natural gas drilling,the maximum vertical displacement of the floor of 5-20111 fully mechanized mining face is 40 mm,and the maximum disturbance failure depth of the floor is about 16 m.In the mining process of the working face,under the working face floor,the maximum rock failure depth of the abandoned natural gas well and within 1 m of the surrounding rock mass is about 80 m.Within this 80 m of range,the rock mass within 0.3 m of the drilling well will be dam-aged,leading to the appearance of air escape channel.
fully mechanized mining facenatural gas drillingfloor failure characteristicssealing structuregas passage
万方数据
维普
