黄土地层地铁盾构施工诱发地表沉降预测研究
发布时间：2018-11-21 09:56
【摘要】：地铁盾构施工引起的地层位移和地面沉陷及建筑物开裂、损坏等问题已经成为隧道建设者、设计者和施工者最为关心的环境问题与工程问题。近些年来，国内外学者针对盾构施工诱发的地表沉降问题也做了大量的研究，并取得了一定的成果。但是在分析目前已有理论对地表沉降的预测结果时发现，在预测过程中并没有同时考虑开挖隧道周围土体弹塑性变形和土体移动模式对盾尾环形收敛空间形态和大小的影响，导致预测结果与实测结果相比都偏大。文中在随机介质理论预测模型的基础上，利用弹塑性理论的相关知识和对土体移动模式的分析，对盾尾环形收敛空间和地层主要影响角进行了分析计算。取得了如下成果： （1）从理论上解释了盾构推进时的地层变形机理，归纳总结了引起地层损失的主要因素。在此基础上，利用弹塑性理论的相关知识对单孔圆形隧道盾构开挖后的应力-应变状态进行弹塑性理论分析，得到了随机介质理论中考虑了盾尾弹塑性变形的盾尾环形收敛空间计算式。 （2）分析了随机介质理论中地层主要影响角对预测结果的影响，并通过分析盾构过后隧道上覆土体移动模式对地表沉降的影响，结合土体移动焦点理论，得到了盾构施工引起地表沉降预测时主要影响角的确定方法。 （3）使用Matlab计算软件，并编写了随机介质地表沉降预测公式相应的Matlab计算程序，实现了地铁盾构施工诱发的地表沉降的预测。并分析了在盾构施工诱发的地表沉降中，隧道的埋深、隧道半径、断面收敛量、地层主要影响角、盾尾弹塑性变形量、偏心超挖量以及开挖面处的附加压力对地表沉降的影响。 （4）根据文中对盾构过后断面收敛量和地层主要影响角的计算，并结合已有的隧道周围土体的不均匀收敛计算模型，，将随机介质预测模型分为两个部分，得到了既可以考虑弹塑性变形的影响，又可以考虑土体移动模式影响的不均匀收敛计算模型。 （5）利用本文所述的方法分别对西安地铁一号线、二号线和三号线某区间段盾构施工段诱发的地表沉降进行了预测，并与实测结果进行了比较。分析可知，理论预测结果与实测结果较符合，故可供工程实际参考。
[Abstract]:The problems of ground displacement, ground subsidence, building cracking and damage caused by shield tunneling have become the most concerned environmental and engineering problems by tunnel builders, designers and constructors. In recent years, scholars at home and abroad have done a lot of research on the ground subsidence caused by shield construction, and have achieved certain results. However, after analyzing the prediction results of ground subsidence in the existing theories, it is found that the influence of soil elastoplastic deformation and soil movement model on the shape and size of shield tail annular convergence space is not considered simultaneously in the prediction process. As a result, the predicted results are larger than the measured ones. Based on the prediction model of random medium theory and using the knowledge of elastic-plastic theory and the analysis of soil movement model, the paper analyzes and calculates the ring convergence space of shield tail and the main influence angle of stratum. The results are as follows: (1) the mechanism of formation deformation during shield tunneling is explained theoretically and the main factors causing formation loss are summarized. On this basis, the elastic-plastic theory is used to analyze the stress-strain state of single-hole circular tunnel shield tunneling by using the relevant knowledge of elastic-plastic theory. In the theory of stochastic medium, the formula for calculating the ring convergence space of shield tail considering the elastoplastic deformation of shield tail is obtained. (2) the influence of the main influence angle of stratum on the prediction results is analyzed in the random medium theory, and by analyzing the influence of the movement mode of the overlying soil on the ground settlement after shield tunneling, combining with the theory of soil movement focus, The method of determining the main influence angle in the prediction of surface settlement caused by shield construction is obtained. (3) using Matlab calculation software and compiling the Matlab calculation program corresponding to the prediction formula of surface subsidence in random medium, the prediction of ground subsidence induced by shield construction of subway is realized. The influence of tunnel depth, tunnel radius, cross section convergence, formation influence angle, shield tail elastoplastic deformation, eccentricity overexcavation and additional pressure on surface settlement are analyzed. (4) according to the calculation of section convergence and the main influence angle of stratum after shield tunneling, and combined with the existing non-uniform convergence model of soil around the tunnel, the stochastic medium prediction model is divided into two parts. A non-uniform convergence model, which can not only consider the effect of elastic-plastic deformation but also the influence of soil movement mode, is obtained. (5) using the method described in this paper, the ground subsidence induced by shield tunneling in a section of Xi'an Metro Line 1, Line 2 and Line 3 is predicted, and the results are compared with the measured results. The analysis shows that the theoretical prediction results are in good agreement with the measured results, so it can be used as a reference for engineering practice.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
本文编号：2346627
[Abstract]:The problems of ground displacement, ground subsidence, building cracking and damage caused by shield tunneling have become the most concerned environmental and engineering problems by tunnel builders, designers and constructors. In recent years, scholars at home and abroad have done a lot of research on the ground subsidence caused by shield construction, and have achieved certain results. However, after analyzing the prediction results of ground subsidence in the existing theories, it is found that the influence of soil elastoplastic deformation and soil movement model on the shape and size of shield tail annular convergence space is not considered simultaneously in the prediction process. As a result, the predicted results are larger than the measured ones. Based on the prediction model of random medium theory and using the knowledge of elastic-plastic theory and the analysis of soil movement model, the paper analyzes and calculates the ring convergence space of shield tail and the main influence angle of stratum. The results are as follows: (1) the mechanism of formation deformation during shield tunneling is explained theoretically and the main factors causing formation loss are summarized. On this basis, the elastic-plastic theory is used to analyze the stress-strain state of single-hole circular tunnel shield tunneling by using the relevant knowledge of elastic-plastic theory. In the theory of stochastic medium, the formula for calculating the ring convergence space of shield tail considering the elastoplastic deformation of shield tail is obtained. (2) the influence of the main influence angle of stratum on the prediction results is analyzed in the random medium theory, and by analyzing the influence of the movement mode of the overlying soil on the ground settlement after shield tunneling, combining with the theory of soil movement focus, The method of determining the main influence angle in the prediction of surface settlement caused by shield construction is obtained. (3) using Matlab calculation software and compiling the Matlab calculation program corresponding to the prediction formula of surface subsidence in random medium, the prediction of ground subsidence induced by shield construction of subway is realized. The influence of tunnel depth, tunnel radius, cross section convergence, formation influence angle, shield tail elastoplastic deformation, eccentricity overexcavation and additional pressure on surface settlement are analyzed. (4) according to the calculation of section convergence and the main influence angle of stratum after shield tunneling, and combined with the existing non-uniform convergence model of soil around the tunnel, the stochastic medium prediction model is divided into two parts. A non-uniform convergence model, which can not only consider the effect of elastic-plastic deformation but also the influence of soil movement mode, is obtained. (5) using the method described in this paper, the ground subsidence induced by shield tunneling in a section of Xi'an Metro Line 1, Line 2 and Line 3 is predicted, and the results are compared with the measured results. The analysis shows that the theoretical prediction results are in good agreement with the measured results, so it can be used as a reference for engineering practice.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
【参考文献】
相关期刊论文 前2条
1 李强,曾德顺;盾构千斤顶推力变化对地面变形的影响[J];地下空间;2002年01期
2 马紫娟;王李管;刘红兵;;土压平衡盾构双线隧道施工引起的地表沉降规律研究[J];石家庄铁道学院学报(自然科学版);2007年04期
本文编号：2346627
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