砂质粉土地区基坑开挖对临近既有隧道的影响研究

发布时间：2018-01-19 00:23

本文关键词： 基坑开挖既有隧道砂质粉土 HSS模型数值模拟　出处：《浙江工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国经济的快速发展和城市现代化步伐的加快,人们对于空间的需求越来越大,特别是在发达城市,有限的土地资源与日益增长的建设需求之间的矛盾越来越显著。为了解决这一矛盾,人们开始向高空和地下索取空间,出现了大量的超高层建筑和地下建筑物。随着地下轨道交通系统的推进,后来的建设工程基坑开挖必须考虑其对周边环境的影响,特别是敏感的盾构隧道,超量的变形必然会导致造价昂贵的既有隧道变形产生安全隐患。针对砂质粉土地区基坑开挖与既有隧道的相互影响,本文的内容包括:(1)根据论文和相关资料,分析城东粉土沉积规律及其特征。(2)利用前人的研究经验以及工程地勘资料给出初步的砂质粉土HS模型参数,结合数值土工模拟试验和实验室土工试验实测结果的对比修正HS模型参数,在修正后的HS模型上加入小应变参数,获得砂质粉土的HSS模型参数。(3)采用确定好的粉土HSS模型参数,通过Plaxis岩土数值计算软件模拟深基坑开挖对临近既有隧道的影响,结合实测结果分析模拟的适用性和科学性。最后将HSS部分参数每个分别增加2%,分析粉土HSS模型参数的敏感性。(4)在模拟结果的基础上,改变隧道埋深、与基坑水平距离、降水深度,分析这些因素对开挖变形的影响,探究基坑开挖对邻近既有隧道影响的机理。
[Abstract]:With the rapid development of our economy and the acceleration of the pace of urban modernization, the demand for space is increasing, especially in developed cities. The contradiction between the limited land resources and the increasing demand for construction is becoming more and more obvious. In order to solve this contradiction, people began to ask for space from the upper air and underground. With the development of underground rail transit system, the excavation of foundation pit in subsequent construction projects must consider its impact on the surrounding environment, especially the sensitive shield tunnel. Excessive deformation will inevitably lead to the costly deformation of the existing tunnel resulting in safety risks. The excavation of foundation pit and the existing tunnel in sandy and silty soil area will affect each other. The content of this paper includes: 1) according to the paper and related materials. (2) based on the previous research experience and engineering geological prospecting data, the preliminary parameters of sand silt HS model are given. The parameters of HS model are modified by comparing the measured results of numerical geotechnical simulation test with that of laboratory geotechnical test, and small strain parameters are added to the modified HS model. The HSS model parameters of sandy silt are obtained. (3) the determined parameters of silt HSS model are used to simulate the influence of deep foundation pit excavation on adjacent existing tunnel by Plaxis geotechnical numerical calculation software. Combined with the measured results, the applicability and scientificity of the simulation are analyzed. Finally, the sensitivity of the HSS model parameters of silty soil is analyzed by adding 2 parts of each parameter of the HSS.) on the basis of the simulation results. By changing the depth of tunnel, horizontal distance from foundation pit and depth of precipitation, the influence of these factors on excavation deformation is analyzed, and the mechanism of influence of excavation on adjacent existing tunnel is explored.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U456.3;TU753

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