盾构机千斤顶偏角对管片及螺栓影响分析研究
发布时间：2019-03-19 17:46
【摘要】：管片衬砌作为盾构施工的三大要素之一具有举足轻重的地位,其受力与变形关乎盾构隧道施工过程和运营阶段的安全与质量。管片衬砌在施工过程中的受力是复杂的、多样的,本文以兰州地铁迎门滩站至马滩站区间盾构隧道为工程依托,依据现场实际数据,建立管片受力分析模型,在重点分析管片注浆压力的情况下,研究了千斤顶不同偏角对管片位移、应力,螺栓轴力与剪力以及管片间隙的影响。具体内容如下:通过考虑浆液粘度时变特性、浆液自重、地下水的作用以及浆液扩散边界条件等因素,分析了Bingham流体的扩散特性,得出了浆液扩散距离计算公式,以及浆液对管片压力消散公式。通过分析盾构机上下行与左右行驶时千斤顶作用力,并建立数值分析模型,研究分析管片、螺栓等受力与变形共计33种工况,结果表明:(1)千斤顶对盾尾钢环内管片的竖向与水平位移影响较大,并且随着千斤顶偏角的加大,影响程度也随之变大;(2)盾构机千斤顶偏角对管片的最大主应力影响程度要大于对最小主应力的影响程度,其中最大主应力增长率可以达到最小主应力增长率的10倍多;盾构机下行时可以使管片的最大主应力减小,2.0°时管片最大主应力可以减少20%左右,使管片受力更加合理;(3)螺栓的最大轴力一般出现距离千斤顶最近的一环管片的环向螺栓之上,对于盾构机上行与左右行驶而言,千斤顶偏角2.0°时螺栓轴力可以达到0.0°偏角的8~9倍;对于盾构机下行而言,螺栓最大轴力先减小后增大,并在0.8°左右出现极小值;纵向螺栓的最大剪力一般出现在第三环与第四环之间,注浆孔位置附近以及管片环下部的纵向螺栓所受剪力较大;(4)间隙的最大剪切应力一般出现在管片与围岩之间,最大压应力出现在管片环与管片环之间的间隙,盾构机上行与左右行驶时可使两者随千斤顶偏角的增大而增大;盾构机下行时可以使两者随千斤顶偏角的增大而减小。管片环之间的最大切应力一般出现在第三环与第四环管片之间,其分布与管片轴力大小以及纵向螺栓分布位置有关。
[Abstract]:As one of the three major elements of shield construction, segment lining plays an important role. The stress and deformation of segment lining are related to the safety and quality of shield tunnel construction process and operation stage. The stress of segment lining in the construction process is complex and diverse. Based on the shield tunnel between Yingmentan Station and Matan Station of Lanzhou Metro, the stress analysis model of segment is established according to the actual data on the spot, and the stress analysis model of the segment is established based on the shield tunnel of Yingmentan Station to Matan Station of Lanzhou Metro. Based on the analysis of segment grouting pressure, the effects of different biasing angles of Jack on segment displacement, stress, bolt axial force and shear force as well as segment clearance are studied. The specific contents are as follows: by taking into account the time-varying characteristics of slurry viscosity, the gravity of slurry, the role of groundwater and the boundary conditions of slurry diffusion, the diffusion characteristics of Bingham fluid are analyzed, and the formula for calculating the diffusion distance of slurry is obtained. And the pressure dissipation formula of slurry to segment. By analyzing the force of Jack when the shield machine is moving up and down and in the left and right, the numerical analysis model is established to study and analyze 33 kinds of working conditions, such as the force and deformation of pipe segments, bolts and so on. The results show that: (1) the influence of Jack on the vertical and horizontal displacement of the inner segment of the steel ring of shield tail is greater, and with the increase of the deflection angle of the Jack, the influence degree also becomes larger; (2) the influence of Jack angle of shield machine on the maximum principal stress is greater than that on the minimum principal stress, in which the growth rate of maximum principal stress can reach more than 10 times of the minimum principal stress growth rate; The maximum principal stress of the segment can be reduced by 20% at 2.0 掳, which makes the force of the segment more reasonable. (3) the maximum axial force of the bolt usually appears above the circumferential bolt of the ring segment closest to the Jack. As far as the shield machine is concerned, the axial force of the bolt can reach 8 times of that of 0.0 掳when the Jack angle is 2.0 掳; As far as shield machine is concerned, the maximum axial force of bolt decreases first and then increases, and the minimum value appears at about 0.8 掳. The maximum shear force of the longitudinal bolt usually appears between the third ring and the fourth ring, and the shear force of the longitudinal bolt near the grouting hole position and the lower part of the segment ring is larger. (4) the maximum shear stress of the clearance usually occurs between the segment and the surrounding rock, and the maximum compressive stress appears between the segment ring and the segment ring. The maximum shear stress of the clearance appears between the segment ring and the segment ring. When the shield machine moves up and down, the maximum shear stress can increase with the increase of the Jack deflection angle. Shield machine downlink can make both of them decrease with the increase of Jack angle. The maximum shear stress between the segments usually occurs between the third ring and the fourth ring. The distribution of the shear stress is related to the axial force of the segment and the location of the longitudinal bolt.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43
本文编号：2443749
[Abstract]:As one of the three major elements of shield construction, segment lining plays an important role. The stress and deformation of segment lining are related to the safety and quality of shield tunnel construction process and operation stage. The stress of segment lining in the construction process is complex and diverse. Based on the shield tunnel between Yingmentan Station and Matan Station of Lanzhou Metro, the stress analysis model of segment is established according to the actual data on the spot, and the stress analysis model of the segment is established based on the shield tunnel of Yingmentan Station to Matan Station of Lanzhou Metro. Based on the analysis of segment grouting pressure, the effects of different biasing angles of Jack on segment displacement, stress, bolt axial force and shear force as well as segment clearance are studied. The specific contents are as follows: by taking into account the time-varying characteristics of slurry viscosity, the gravity of slurry, the role of groundwater and the boundary conditions of slurry diffusion, the diffusion characteristics of Bingham fluid are analyzed, and the formula for calculating the diffusion distance of slurry is obtained. And the pressure dissipation formula of slurry to segment. By analyzing the force of Jack when the shield machine is moving up and down and in the left and right, the numerical analysis model is established to study and analyze 33 kinds of working conditions, such as the force and deformation of pipe segments, bolts and so on. The results show that: (1) the influence of Jack on the vertical and horizontal displacement of the inner segment of the steel ring of shield tail is greater, and with the increase of the deflection angle of the Jack, the influence degree also becomes larger; (2) the influence of Jack angle of shield machine on the maximum principal stress is greater than that on the minimum principal stress, in which the growth rate of maximum principal stress can reach more than 10 times of the minimum principal stress growth rate; The maximum principal stress of the segment can be reduced by 20% at 2.0 掳, which makes the force of the segment more reasonable. (3) the maximum axial force of the bolt usually appears above the circumferential bolt of the ring segment closest to the Jack. As far as the shield machine is concerned, the axial force of the bolt can reach 8 times of that of 0.0 掳when the Jack angle is 2.0 掳; As far as shield machine is concerned, the maximum axial force of bolt decreases first and then increases, and the minimum value appears at about 0.8 掳. The maximum shear force of the longitudinal bolt usually appears between the third ring and the fourth ring, and the shear force of the longitudinal bolt near the grouting hole position and the lower part of the segment ring is larger. (4) the maximum shear stress of the clearance usually occurs between the segment and the surrounding rock, and the maximum compressive stress appears between the segment ring and the segment ring. The maximum shear stress of the clearance appears between the segment ring and the segment ring. When the shield machine moves up and down, the maximum shear stress can increase with the increase of the Jack deflection angle. Shield machine downlink can make both of them decrease with the increase of Jack angle. The maximum shear stress between the segments usually occurs between the third ring and the fourth ring. The distribution of the shear stress is related to the axial force of the segment and the location of the longitudinal bolt.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43
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