路堑施工对邻近隧道安全影响的数值分析及防护研究

发布时间：2018-01-09 20:30

本文关键词：路堑施工对邻近隧道安全影响的数值分析及防护研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：随着我国节约集约利用土地政策出台和工程建设项目的增多,越来越多的新建工程邻近既有建筑(构)物修建。在邻近既有隧道一侧进行路堑施工,必然会对邻近隧道产生影响。当路堑开挖引起的岩体位移超过一定程度时,就会引起衬砌结构的倾斜、开裂,使其安全性能降低,影响隧道的安全稳定和正常使用,因此,开展路堑施工对近邻隧道安全影响及防护研究,具有重要的理论意义和应用价值。本文利用有限元分析软件ANSYS对路堑施工过程中既有隧道衬砌位移、应力进行了模拟分析,并结合工程实际,提出了相应防护措施,本文主要研究内容和成果如下： (1)在理论分析基础上,运用ANSYS软件,建立了路堑非爆破开挖对既有隧道安全影响的数值分析模型。 (2)分别对路堑自上而下和左右交替两种开挖方式作用下既有隧道衬砌静力学响应分析进行数值模拟,获得了路堑采用两种开挖方式施工对既有隧道衬砌影响规律。综合对比两种开挖方式,由上而下开挖方式的安全系数大于左右交替开挖方式。 (3)结合工程实际,利用ANSYS/LS-DYNA建立路堑爆破开挖对邻近既有隧道衬砌结构振动影响分析模型,并对不同装药量条件下路堑爆破开挖对既有隧道衬砌结构振动影响进行模拟,模拟结果显示爆破开挖方式不适宜于该路堑工程。 (4)结合工程实际,提出了路堑开挖前及施工过程中既有隧道安全防护工程技术措施,为现场安全施工提供指导。
[Abstract]:Abstract : As our country saves intensive use of land policy and the increase of project construction projects , more and more new projects are built adjacent to the existing buildings ( structures ) . When the displacement of rock mass caused by cutting excavation exceeds a certain degree , the safety performance of the lining structure is reduced , the safety and stability of the tunnel are affected and the application value is affected . Therefore , the paper uses finite element analysis software ANSYS to simulate the displacement and stress of the existing tunnel lining and puts forward corresponding protection measures . The main research contents and results are as follows : ( 1 ) Based on the theoretical analysis , ANSYS software is used to establish a numerical analysis model for the safety impact of cut - cut non - blasting excavation on existing tunnel . ( 2 ) Numerical simulation of the static response of the existing tunnel lining under the action of two excavation methods from top to bottom and left and right are carried out respectively , and the influence rule of two kinds of excavation methods on the existing tunnel lining is obtained . ( 3 ) Combined with engineering practice , using ANSYS / LS - DYNA to establish the analysis model of vibration effect of cut blasting excavation on adjacent existing tunnel lining structure , and simulate the vibration effect of cut blasting excavation on existing tunnel lining structure under different loading conditions , the simulation results show that blasting excavation method is not suitable for cutting engineering . ( 4 ) In combination with the engineering practice , the technical measures for the safety protection of the existing tunnel are put forward before and during the excavation , so as to provide guidance for the site safety construction .

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.3;U416.13

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