考虑渗流应力耦合的深基坑开挖对邻近隧道的影响

发布时间：2018-01-02 14:20

本文关键词：考虑渗流应力耦合的深基坑开挖对邻近隧道的影响　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：近几年因地下水处理不当造成的深基坑事故越来越多。杭州地区不仅地下水位较高,而且土质特殊,因此地下水的处理也就愈加棘手。深基坑开挖与降水时,势必会在土体内引发渗流作用,改变土体内的应力,导致地表和周围建筑物发生沉降变形。基于以上问题,做了如下工作:1、学习了渗流的基本概念和渗流计算所依据的理论方程,研究了渗流应力耦合模型的建立过程;并对三维快速拉格朗日有限差分程序FLAC3D在渗流与应力耦合方面的应用进行了介绍与分析。2、以杭州市彩虹大道B标段邻近地铁隧道的深基坑工程为依托,利用FLAC3D将深基坑开挖过程中渗流与应力耦合作用考虑在内,对深基坑开挖与降水过程对临近隧道变形的影响进行数值模拟。3、深入分析了该工程的实测和数值模拟结果,并将周围建筑物位移、既有隧道变形和站台、站厅位移的现场实测值与数值模拟结果进行对比。对比结果显示考虑渗流与应力耦合作用与实际结果较为吻合。4、得出在杭州等特殊土质地区深基坑进行开挖降水时,应将渗流与应力耦合作用考虑在内的结论,可为今后类似工程提供参考。目前在临江靠海等地下水比较发育的地区,进行深基坑开挖降水时很少考虑渗流与应力耦合效应的影响,但大量的实际工程表明:将渗流与应力耦合效应考虑在内比较符合工程实际,能够有效避免工程事故的发生。论文成果验证了在杭州特殊土质且地下水系发育地区,应该考虑渗流与应力耦合效应,为类似工程是否考虑渗流与应力耦合影响提供参考。
[Abstract]:In recent years, due to groundwater treatment more and more accidents caused by improper deep excavation in Hangzhou area. Not only the underground water level is higher, and the soil quality is special, so the groundwater treatment will be more difficult. And the precipitation of deep excavation, will inevitably lead to seepage in the soil and soil stress changes in the body, leading to the surface and surrounding buildings occurred settlement deformation. Based on the above problems, do the following work: 1, learning the basic concepts and theoretical equation of seepage calculation of seepage on the basis of the research, the process of seepage force coupling model should be established; and the 3D Lagrange finite difference program FLAC3D on seepage and stress coupling were introduced and analyzed.2, deep foundation pit project in Hangzhou City Rainbow Road section B adjacent Metro Tunnel Based on the use of FLAC3D in the process of excavation of deep foundation pit seepage and stress coupling effect should be considered, for Deep foundation pit excavation and dewatering process numerical simulation of effect of.3 on the near tunnel deformation, in-depth analysis of the simulation results and the measured numerical engineering, and the buildings around the tunnel deformation and displacement, the platform, the results were compared with numerical simulation. The station Hall displacement field measured values. The results show that the seepage and stress the force coupling effect and the actual result is consistent with.4, the deep foundation pit in Hangzhou and other areas of special soil excavation and precipitation, should be and should consider the coupling effect of seepage force, the conclusion can provide reference for similar projects in the future. At present in the Linjiang sea groundwater relatively developed area, deep excavation are rarely considering the influence of seepage and stress coupling effect, but a large number of practical projects shows that the seepage and stress coupling effect into consideration compared with the engineering practice, can effectively avoid. The results of the paper confirm that the coupling effect of seepage and stress should be considered in the development of special soil and underground water development area in Hangzhou, so as to provide references for similar projects to consider the coupling effect of seepage and stress.

【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3;TU753

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