【摘要】：城市化帶來的交通擁堵問題越來越嚴(yán)重,地鐵成為重要的交通工具之一,地鐵沿線的建筑物也隨之興起。建筑物的施工對臨近地鐵隧道的影響成為工程界不可忽視的一大問題,其中深基坑開挖卸荷導(dǎo)致地鐵產(chǎn)生附加變形和內(nèi)力,可能會嚴(yán)重影響地鐵隧道的安全。如何準(zhǔn)確預(yù)測深基坑開挖對已有地鐵隧道的影響,是一項(xiàng)急需解決的課題。本文的主要工作包括： 1)在收集和統(tǒng)計(jì)國內(nèi)外28個臨近既有地鐵隧道的基坑工程案例的基礎(chǔ)上,應(yīng)用數(shù)理統(tǒng)計(jì)方法,對工程概況、基坑與隧道的相對位置關(guān)系、坑內(nèi)外土體加固、地下水以及時空效應(yīng)等因素進(jìn)行分析,總結(jié)了基坑開挖引起的臨近地鐵隧道變形的基本規(guī)律。 2)基于杭州某一工程實(shí)例,采用Plaxis3D有限元軟件建立基坑三維有限元分析模型,其中土體本構(gòu)模型分別采用MC模型、HS模型和HSS模型,分析基坑開挖引起隧道變形、地連墻水平位移及地表沉降等,并將各模型計(jì)算結(jié)果與工程實(shí)際監(jiān)測數(shù)據(jù)進(jìn)行比較,整理可知應(yīng)用HSS模型分析的結(jié)果與實(shí)測數(shù)據(jù)最為吻合。 3)針對杭州東部典型軟土,土體本構(gòu)模型采用HSS模型建立基坑三維有限元分析模型,分析隧道與基坑相對水平距離、相對高差、基坑開挖深度、基坑分區(qū)開挖、隧道環(huán)外部土體擾動區(qū)、地下水以及單雙基坑開挖對臨近地鐵隧道變形等的影響規(guī)律。
[Abstract]:The traffic congestion caused by urbanization is becoming more and more serious. Subway becomes one of the most important means of transportation, and the buildings along the subway also rise. The influence of the building construction on the adjacent subway tunnel has become a big problem which can not be ignored by the engineering circle. The excavation and unloading of deep foundation pit may lead to the additional deformation and internal force of the subway, which may seriously affect the safety of the subway tunnel. How to accurately predict the influence of deep foundation pit excavation on existing subway tunnels is an urgent task to be solved. The main work of this paper is as follows: 1) based on the collection and statistics of 28 cases of foundation pit engineering near the existing subway tunnel at home and abroad, the paper applies mathematical statistical method to analyze the general situation of the project and the relative position relationship between the foundation pit and the tunnel. Based on the analysis of the factors such as soil reinforcement, groundwater and space-time effect inside and outside the pit, the basic law of deformation caused by excavation of foundation pit near subway tunnel is summarized. 2) based on an engineering example in Hangzhou, The three-dimensional finite element analysis model of foundation pit is established by using Plaxis3D software. Among them, the MC model and the HSS model are used to analyze the tunnel deformation, horizontal displacement and ground subsidence caused by foundation pit excavation. The calculated results of each model are compared with the actual monitoring data of engineering, and the result of HSS model analysis is the most consistent with the measured data. 3) aiming at the typical soft soil in the eastern part of Hangzhou, The HSS model is used to establish the three-dimensional finite element analysis model of foundation pit. The relative horizontal distance between tunnel and foundation pit, the relative height difference, the excavation depth of foundation pit, the zonal excavation of foundation pit, the disturbed area of soil outside the tunnel ring are analyzed. The influence of groundwater and excavation of single and double foundation pit on the deformation of adjacent subway tunnel.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U231;TU753

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