煤矿斜井管片衬砌接头力学性能研究
发布时间：2018-08-03 12:12
【摘要】：随着煤炭资源的深部开采,采用斜井方式建设运输通道的方式被广泛运用。相比于传统的矿山法修建煤矿斜井,盾构/TBM工法安全程度高,施工速度快,采用盾构/TBM工法修建煤矿长距离斜井已成为当前煤炭资源开发的重要课题。本文依托神东补连塔煤矿斜井工程,针对煤矿斜井管片衬砌接头力学性能开展研究,主要的研究工作及成果如下:1.制作了两组管片接头构件并布置了传感器,对盾构管片接头分别进行了正弯矩加载试验与负弯矩加载试验。探明了不同轴力作用下,弯矩对管片接头张开量、转角以及接缝附近各表面混凝土应变的影响规律。试验还对管片接头进行了破坏试验,得到了在大轴力作用时,管片接头受弯破坏特点,其破坏特性表现为混凝土首先压碎破坏,螺栓变形量较小。2.以试验数据为基础,经过数学变换,研究了不同轴力下,管片接头抗弯刚度随弯矩变化规律,并给出了不同轴力下抗弯刚度的取值范围。同时采用有限元软件,建立了三维有限元模型,研究了不同轴力作用下,管片接头转角随弯矩变化关系,接头抗弯刚度随弯矩变化关系,并与试验结果进行了对比分析,研究结果表明,有限元计算得到的抗弯刚度值小于试验结果。3.根据试验研究得到的管片接头抗弯刚度值,提出了基于接头抗弯刚度迭代的梁-弹簧模型。研究了接头抗弯刚度对管片衬砌结构内力、位移的影响规律,接头抗弯刚度增加,衬砌结构内力增大,位移减小。同时对比分析不同荷载组合下梁-弹簧模型与匀质圆环模型计算结果的差异,梁-弹簧模型计算结果相对于匀质圆环计算结果,弯矩较小,剪力、轴力、位移则较大。
[Abstract]:With the deep mining of coal resources, the construction of transportation passage by inclined well is widely used. Compared with the traditional mining method, the shield / TBM method is of high safety and fast construction speed. It has become an important subject of coal resource development to use shield / TBM method to build long distance inclined shaft in coal mine. Based on the inclined well engineering of Shendong Bulinta Coal Mine, this paper studies the mechanical properties of the lining joint of the inclined shaft segment in the coal mine. The main research work and results are as follows: 1. Two groups of segment joint members were made and sensors were arranged. The positive moment loading test and negative moment loading test of shield segment joint were carried out. The influence of bending moment on the opening and angle of segment joint and the strain of concrete on each surface near the joint was investigated under the action of different axial forces. The failure test of segment joint is also carried out, and the bending failure characteristics of segment joint under the action of large axial force are obtained. The failure characteristic of segment joint is first crushed concrete, and the deformation of bolt is small. 2. Based on the experimental data and mathematical transformation, the variation of bending stiffness of segment joints with bending moment under different axial forces is studied, and the value range of bending stiffness under different axial forces is given. At the same time, a three-dimensional finite element model is established by using the finite element software. The relationship between the angle of the segment joint and the moment and the bending stiffness of the joint with the bending moment are studied under different axial forces, and the results are compared with the experimental results. The results show that the bending stiffness calculated by finite element method is smaller than that of test. Based on the bending stiffness of segment joint, a beam-spring model based on flexural stiffness iteration is proposed. The influence of joint bending stiffness on the internal force and displacement of segment lining structure is studied. The bending stiffness of joint increases and the internal force of lining structure increases and the displacement decreases. At the same time, the difference between beam-spring model and homogeneous ring model under different load combinations is analyzed. The results of beam-spring model are smaller than those of homogeneous ring, and the bending moment is smaller, the shear force, axial force and displacement are larger.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD55
本文编号：2161711
[Abstract]:With the deep mining of coal resources, the construction of transportation passage by inclined well is widely used. Compared with the traditional mining method, the shield / TBM method is of high safety and fast construction speed. It has become an important subject of coal resource development to use shield / TBM method to build long distance inclined shaft in coal mine. Based on the inclined well engineering of Shendong Bulinta Coal Mine, this paper studies the mechanical properties of the lining joint of the inclined shaft segment in the coal mine. The main research work and results are as follows: 1. Two groups of segment joint members were made and sensors were arranged. The positive moment loading test and negative moment loading test of shield segment joint were carried out. The influence of bending moment on the opening and angle of segment joint and the strain of concrete on each surface near the joint was investigated under the action of different axial forces. The failure test of segment joint is also carried out, and the bending failure characteristics of segment joint under the action of large axial force are obtained. The failure characteristic of segment joint is first crushed concrete, and the deformation of bolt is small. 2. Based on the experimental data and mathematical transformation, the variation of bending stiffness of segment joints with bending moment under different axial forces is studied, and the value range of bending stiffness under different axial forces is given. At the same time, a three-dimensional finite element model is established by using the finite element software. The relationship between the angle of the segment joint and the moment and the bending stiffness of the joint with the bending moment are studied under different axial forces, and the results are compared with the experimental results. The results show that the bending stiffness calculated by finite element method is smaller than that of test. Based on the bending stiffness of segment joint, a beam-spring model based on flexural stiffness iteration is proposed. The influence of joint bending stiffness on the internal force and displacement of segment lining structure is studied. The bending stiffness of joint increases and the internal force of lining structure increases and the displacement decreases. At the same time, the difference between beam-spring model and homogeneous ring model under different load combinations is analyzed. The results of beam-spring model are smaller than those of homogeneous ring, and the bending moment is smaller, the shear force, axial force and displacement are larger.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD55
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