Study On Failure Mechanism And Reinforcement Technology Of Surrounding Rock In No.2 Auxiliary Roadway Of Huangling No.2 Coal

Under the condition of coal mining on both sides of the roadway,with the combination of the rock's own stress and tectonic stress,the roadway will be affected by the mining and the deformation of the surrounding rock of the roadway,When the other side of the face mining,the roadway will be affected by the secondary mining,roadway of rock often deformation and damage further intensified.In the deep soft rock roadway,this mining effect will be more significant.Therefore,it is of great significance to study the failure characteristics and support technology of deep soft rock roadway under the influence of mining.However,due to the particularity of the surrounding rock of the deep soft rock roadway,the anchorage cable support can not fully perform its performance.For this reason,this paper makes full use of the theoretical analysis and loosening of the soft rock roadway,Circle test,FLAC3 D numerical simulation,industrial test research method,take Huangling No.2 well northbound roadway 2 auxiliary roadway as the project background,detailed analysis of the factors of roadway destruction and put forward targeted governance method.The main research contents and achievements are as follows:1)Through the mechanical testing of roadway surrounding rock sampling,the physical and mechanical parameters of surrounding rock are obtained,and the degree of integrity of surrounding rock is obtained,and the surrounding rock is judged to be soft rock.The strength of roadway is low,the roof of the roadway has weak structure,and the gang is coal.It is necessary to improve the stability of surrounding rock and rock mechanics parameters by grouting reinforcement.That is,the higher the height,the smaller the bearing pressure.The greater the fracture distance of the key layer,the greater the pressure to the larger pressure,the greater the pressure of the coal bearing by the advance support,the scope of the impact is also large;stop mining line reserved pillar width is too small,the roadway by the advanced support pressure,Leading to full cross-section damage occurred in the roadway,the need to reasonably determine the width of the reserved pillar.2)Using FLAC3 D numerical software to simulate,it is concluded that the maximum concentrated stress working distance of working face is about 32.3m,the maximum bearing pressure is 28.62MPa(stress increase coefficient is about 2.2),and the working area is about 202 m Mining affected area;wiping mining face to stop mining coal pillar support pressure to show the characteristics of 414 working face to stop mining line in front of about 205 m for the face of mining affected areas,Considering the economic benefit of coal mine and the carrying capacity of roadway,the reserved coal pillar is determined as 195 m.3)through the loosening of the roadway test,the No.2 auxiliary roadway loosening circle range of 3.81m;help loose circle range 4.85m;classification of roadway surrounding,belonging to the VI-level loose moving circle very unstable rock.4)According to the monitoring of 200 days after the control of the roadway,the wall rock of the roadway is stabilized after three months,the roof sinking is about 83 mm,and the floor volume is about 180 mm or so,to help shrinkage of about 54 mm,basically achieved the desired effect,effective control of the surrounding rock deformation,maintaining the stability of the roadway to ensure the normal use of roadway.