Research On Surrounding Rock Control Technologies Of Narrow Pillar Of Mining Height Face

Once mining thickness all comprehensive mechanized coal mining method in large minng height face, it is the fully mechanized coal mining method in large minng height face, which is introduced to China since the1980s, obtained the rapid development of the coal mining method in our country, Shendong mining area,Jincheng mining area, Changzhi area mining area to obtain the very good application, and obtained gratifying achievements. At present the history of coal technology innovation in our country, the construction of high production and efficiency mine of important technical means.From its current application situation, surrounding control theory of large mining height face research take good result, but surrounding rock control technologies of narrow pillar of mining roadways in large mining height face and security issues haven’t been solved effectively, become the main factors which restrict the development of the large mining height face technology further, therefore, to urrounding rock control technologies of narrow pillar of mining roadways in large mining height face of the research is helpful to the further development of large mining height face technology, and to improve the coal recovery rate and guarantee the safe and efficient large mining height are’ broken fully mechanized coal mining method has important scientific and engineering significance.This topic choice just popular large mining height face of fully mechanized coal mining method at Changzhi area, because the surrounding rock control technologies of narrow pillar of mining roadways in large mining height face research is relatively blank,3045return air laneway in Sanyuan wangzhuang coal mine as engineering background, for the following research:(1) Through the study of narrow pillar of mining roadways in large mining height face caving of overlying strata movement rule is:the mian roof will break liake " O-X", strata structure of the stoping laneway formation lateral masonry beam structure, the structure stability is the stability of key block, which are narrow pillar of mining roadways strata structure of the key block’s point of view in large mining height face, the key pieces of characteristic parameters were studied. Establish a reasonable narrow pillar of mining roadways model of strata structure in large mining height face, analysis of the tunneling, digging Wells before and after mining the stability coefficient, obtained the influence law of the roadway stability.(2)FLAC3D is used in this chapter to narrow pillar of mining roadways in large mining height face little this reasonable width of coal pillar numerical simulation research, analysis of different coal pillar width of the stress distribution and displacement evolution law, combining with the theoretical calculation and engineering site actual situation, determine the reasonable width of coal pillar, so as to ensure the stability of coal pillar.(3)with the study of the deformation of the narrow pillar of mining roadways in large mining height face and the principle of the interaction of bolt and surrounding rock, said:the narrow pillar of mining roadways in large mining height face located in the section of the goaf side, the narrow coal pillar has low intensity and low bearing capacity because of the influence of the side abutment pressure of the upper curtate, the working face mining influence will lead to further pillar deformation and failure, cause the most stress to the entity coal transfer, makes the entity coal side jumps, deformation of surrounding rock of roadway is very hard to control, therefore, it is very important to enhance the stability of narrow coal pillar that narrow pillar of mining roadways rock control key in large mining height face.(4) with the research of narrow pillar of mining roadways supporting schemes in large mining height face adoptes the FLAC3D to simulate analysis, to determine the optimal scheme of roadway support. Mastered by field testing of surrounding rock of roadway and the stress of the anchor rod and anchor rope, to verify the rationality and reliability of the bolt support design, determine the stability of surrounding rock of roadway. According to observation data changes support parameters, make its support more reasonable, for the big mining height are broken small pillar extraction roadway support in mine provide theoretical basis for the application.