【作者】 李兵；

【导师】 项彦勇；

【作者基本信息】 北京交通大学 ， 隧道与地下工程， 2017， 硕士

【摘要】 新街矿区斜井井筒采用TBM工法进行施工。在煤矿系统,采用立井比较多,而采用斜井比较少。尤其斜井采用TBM法施工可以说在国内基本属于空白。对这一问题开展研究具有划时代的意义,它对于我国煤矿建设技术是一场革命,为煤矿安全、高效生产具有极其重要的社会、经济、现实意义。本文依托新街矿区煤层开采设计,重点研究由于地下水的存在对斜井管片结构造成的不利影响。以数值模拟为主要研究方法,分别采用UDEC离散元软件和FLAC3D有限差分软件进行二维和三维数值模拟。主要分析了煤层采空区排水边界条件的变化对斜井管片结构内力和位移产生的影响。用UDEC软件进行二维模拟分析时,主要考虑了岩体节理开度和煤层采空区排水边界水压力条件的变化对斜井管片结构内力和位移的影响;用FLAC3D软件进行二维和三维模拟时,主要考虑了煤层采空区节点排水量和煤层采空区排水边界水压力条件的变化对斜井管片结构内力和位移的影响。主要研究工作和取得的成果如下:(1)开挖平衡与排水平衡模拟结果对比可以发现,采空区排水使管片结构内力相对于煤层开采结束时有所增大。且管片结构最大轴力均出现在左帮偏下,最大弯矩则有从左帮向右帮移动的趋势。(2)煤层采空区排水会对管片结构位移尤其是竖向位移产生影响,且增加幅度较大。(3)UDEC二维模拟结果显示,岩层的节理开度越大,采空区排水量也越大,对管片结构位移和内力的影响就越大。(4)FLAC3D二维模拟结果显示,煤层采空区单节点排水量越大,对管片结构的内力和位移影响也越大。(5)煤层采空区排水边界水压力对管片结构内力分布形态的影响不大;随着排水边界设置压力的增大,管片结构的轴力和弯矩都有所减小,但变化量不大。(6)FLAC3D三维模拟结果与二维模拟结果对比可以发现,管片结构内力和位移在三维模拟结果情形下都较二维模拟结果略小,但变化规律基本一致。更多还原

【Abstract】 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.更多还原