| The layout of mine roadway is influenced by mine design and roadway use.For example,near the stopping line at the bottom of the well,in the mining area and in the working face,etc.In the production transshipment location,there is a space staggered arrangement of the roadways which are parallel to each other and oblique to each other.The stress of surrounding rocks in staggered roadways overlaps and interferes with each other,which leads to serious local failure and obvious deformation of the surrounding rock of the roadway,and then it causes the failure of surrounding rock capacity of staggered roadway and causes overall instability.Therefore,this paper takes the surrounding rock condition of 907 auxiliary transport roadways in Qipanjing Coal Mine as the engineering background.Through on-site investigation,theoretical analysis,numerical calculation,industrial test and other research means,the main research includes: the roadway surrounding rock stress staggered between mutual interference effects,the mechanism of disturbance instability of surrounding rock mass between roadways and the control of bearing stability of surrounding rock mass of staggered roadways,etc.The main conclusions are as follows:(1)through on-site investigation and numerical simulation analysis,which is known that:horizontal stress concentration is intense and vertical stress release is obvious in the surrounding rock of staggered roadway,the surrounding rock mass between roadways presents the stress state of " plane lateral extrusion”,and the closer the distance between roadways is,the more serious the superimposed disturbance of surrounding rock stress concentration will be,then the plastic failure of the surrounding rock mass in the staggered position of the roadway extends to the deep part and even has the effect of penetration instability,which is not conducive to the stability of the bearing capacity of the surrounding rock mass between and near the staggered roadways.(2)the mechanical mechanism of surrounding rock stability affected by stress disturbance between staggered roadways is analyzed,the smaller the spacing of staggered roadways and the nearer to parallel arrangement will aggravate the failure of surrounding rocks betweenroadways and induce the failure and penetration of surrounding rocks between roadways,reasonable design of section size and reasonable support strength of roadway below can effectively control and maintain the stability of surrounding rock.(3)Based on the analysis of the complex disturbance stress distribution and the stable load-bearing mechanism of the bearing structure in the short-distance staggered roadway,the technical scheme of “bolt + anchor + steel shed” combined support technology scheme is proposed for the staggered position of roadway and its vicinity,and double-layer metal mesh and concrete remodeling of surrounding rock between roadways are arranged.(4)the industrial test on the staggered position of 907 auxiliary transport roadway shows that: after the implementation of the joint support scheme in907 auxiliary transport roadway at present,the deformation of surrounding rock in 907 auxiliary transport roadway is generally in the range of 15-64 mm,the stability control of staggered roadway support is good.The bearing stability of surrounding rock between close-range staggered roadways is very important for the safe production and normal use of mine roadways,the research results of this paper are of great significance for solving the safety problems of 907 auxiliary transport roadways in Qipanjing Coal Mine,which provides theoretical basis and technical reference for the stability control of surrounding rock of similar short-distance staggered roadway. |
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