| The stability control of roadway is an important foundation to reduce effective span of roof and ensure roof safety.Zhangjialao coal mine in yulin city,shaanxi province is a typical large cross-section of shallow thick coal seam.There is a serious problem of roadway failure in the mining process of working face,which brings great potential safety hazards to the safety production.This paper,taking the changs Mao 5-2 coal mine coal seam roadway engineering background,15207 glue comprehensive field investigation,laboratory test and theoretical analysis,numerical calculation,such as research methods,test the zhangs' Mao mining coal mechanical parameters,analyzes the lane for failure characteristics and the main influencing factors and reveals the lane help strong damage mechanism,and puts forward the roadway supporting technology to design the experiment scheme,analyzes the stability of roadway surrounding rock under different support scheme,the stability of surrounding rock control scheme of the reasonable.The main conclusions are as follows:(1)the failure characteristics of roadway are analyzed and the mechanical parameters of coal are testedThere are three main types of failure in the roadway of zhangjia-mao mine: failure at the shoulder Angle,bulging in the middle,and overall slabbing;Get the lane to help the uniaxial compressive strength of coal is 9.46 MPa,1.16 MPa tensile strength,cohesion c = 1.57,internal friction Angle phi = 18.25 °.(2)the main influencing factors of roadway failure are analyzed,and the failure mechanism of roadway failure is clarified.(a)was deduced by establishing the mechanical model of roadway excavation unloading lane to help in the process of horizontal stress and vertical stress and the plastic zone width,rupture zone width and lane for the displacement of the average expression,and in the process of excavation and stoping lane help destroy the influencing factors are analyzed,concluded that lane for destruction mainly by coal seam roadway height,buried depth,ground stress,cohesion,internal friction Angle of coal,coal,the influence of elastic modulus,poisson's ratio;By using design-express software,a three-factor and three-level test Design of roadway height,width and lateral pressure coefficient is carried out,and the influence of each factor on the horizontal displacement of roadway side wall is obtained.(b)the movement law of roadway surrounding rock is obtained through threedimensional numerical software.After roadway driving,the horizontal stress of coal mass within a certain range of the upper part is significantly reduced compared with that of the original rock,and the vertical stress is significantly increased.The stress difference will lead to the failure of the upper part of the roadway.The roadway side is 0 ~ 2m deep in the tunneling unloading zone,and the range of the plastic zone of roadway side is 2.5m in the tunneling stability period.(3)the strong support technology was proposed and a reasonable control scheme for the stability of roadway surrounding rock was obtained.Through monitoring the mine pressure of 15207 working face of the 5-2 coal seam in zhangjia-mao mine and combining with numerical analysis,it is theoretically feasible to control the stability of roadway surrounding rock through strong support.The 13 kinds of experiment was designed by using the Design-Express software solution,by means of comparing each scheme for using 4 root ? get lane 18 x 3000 mm rebar anchor(between row spacing is 1000 mm * 1200 mm)can effectively control the scope of the plastic zone,and through numerical computation compared with the original plan,the results show that strong supporting Design scheme is compared with the original support scheme for stoping help displacement decreased by 33.1% and coal pillar(not stoping help)decreased by 55.3%,the rationality of the scheme is verified. |
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