Numerical Simulation Analysis On The Effect Of Drainage On The Structure Of Inclined Shaft Segment In Coal Seam

ABSTRACT:The inclined shaft of Xin Jie coal mine is constructed by TBM method.The vertical shafts are used more than the inclined shafts in coal mine system.Especially the inclined shaft that using the method of TBM construction is basically blank in China.Carrying out research on this issue is of epoch-making significance,it is a revolution for coal mine construction technology in China.For the coal mine safety production and high efficiency are of great social economic reality significance.Based on the coal seam mining design,this paper focuses research on the adverse effects on the slope segments that is caused as a result of the existence of groundwater.Using numerical simulation of process as the main research method,this paper performes two dimension and three dimension numerical simulation with the discrete element software UDEC and the finite difference software FLAC3D.This paper mainly analyzes the changes of drainage boundary conditions of the coal mined-out area that has influence on the internal force and displacement of the slope segment.When using the simulation software UDEC doing two-dimensional analysis,the paper mainly consideres the changes of the opening of rock joints and the water pressure conditions of the coal mined-out area that has influence on the internal force and displacement of the slope segments;When using the simulation software FLAC3D doing two dimension and there dimension analysis,the paper mainly consideres the changes of the node displacement and the water pressure conditions of the coal mined-out area that has influence on the internal force and displacement of the slope segments.The main research work and achievements are as follows:(1)The comparison of results of the excavation and water draining of balance show that water drainage of the coal mined-out area makes the segment structure internal force bigger than the value of end of the coal seam mining.And the maximum axial force of segments is on the point that is a little more than left down.The position of the maximum bending moment is changed.(2)The water drainage of the coal mined-out area has influence on segments displacement especially on the vertical displacement,and the increase range is fairly larger.(3)The lager of the opening of the joint of rock the greater of the displacement of the coal mined-out area,so the influence on the internal force and displacement of the slope segments is bigger.(4)The lager of the node displacement and the bigger influence on the internal force and displacement of the slope segments.(5)The water pressure conditions of the coal mined-out area has less influence on the internal force distribution form of segment construction;With the increase of drainage boundary pressure,the axial force and bending moment of segment are reduced,but the change is not big.(6)By comparing the results of the there dimension and the two dimension,it can be found that the internal force and displacement of the slope segment of the there dimension condition is slightly smaller than that of the two dimension condition,but the change rules are basically identical.