【摘要】：本文依托武深高速吉家坡隧道項(xiàng)目,在整理該工程區(qū)域的地質(zhì)資料,隧道設(shè)計(jì)支護(hù)方案的基礎(chǔ)上,結(jié)合超前地質(zhì)預(yù)報(bào)、監(jiān)控量測以及數(shù)值模擬分析三方面去綜合分析隧道圍巖穩(wěn)定性。預(yù)知前方地質(zhì)情況是確保施工安全,施工過程中圍巖穩(wěn)定性的先決條件,首先對比各類超前地質(zhì)預(yù)報(bào)方法發(fā)現(xiàn)單一的超前地質(zhì)預(yù)報(bào)手段并不能很好的預(yù)測前方地質(zhì),常常需要多種探測方法的綜合運(yùn)用,彌補(bǔ)各自的不足,形成一個(gè)較為完整的地址超前預(yù)報(bào),為施工安全提供有力的保障。吉家坡隧道主要運(yùn)用了地質(zhì)素描法、TGP以及地質(zhì)雷達(dá)三種手段。監(jiān)控量測是指導(dǎo)施工的重要手段,通過對其采集數(shù)據(jù)的處理分析,可以有效的對圍巖穩(wěn)定性進(jìn)行一個(gè)大致的預(yù)判,而其采集的數(shù)據(jù)往往與時(shí)間和空間呈現(xiàn)出一定的規(guī)律性,得到四種形式的變化曲線。依據(jù)規(guī)范中所規(guī)定的判定圍巖穩(wěn)定的標(biāo)準(zhǔn),可以通過對數(shù)據(jù)的整理分析得出本隧道的圍巖穩(wěn)定情況,大約與掌子面相距3倍洞徑時(shí),可以進(jìn)行二次襯砌的施作。本文主要通過有限元軟件數(shù)值模擬分析小凈距隧道淺埋段不同覆蓋層厚度的影響、淺埋段不同開挖順序的影響、深埋段不用圍巖級別的影響、深埋段不同凈距的影響以及深埋段不同施工方法的影響�？傻玫揭韵陆Y(jié)論:圍巖變形隨著覆蓋層厚度增加而增加;先開挖深埋側(cè)洞室后開挖淺埋側(cè)洞室更有利于圍巖穩(wěn)定;圍巖變形隨著圍巖級別的增加而減小;14m可能是小凈距隧道的最優(yōu)凈距;CRD工法為最優(yōu)的施工方法,臺階法是最簡單易行的的施工方法。同時(shí),由于圍巖穩(wěn)定性較差會嚴(yán)重影響到二次襯砌的安全,加上在施工過程中,二次襯砌的頂部以及拱肩部位常常因?yàn)榛炷撂畛洳幻軐?shí),導(dǎo)致其厚度不夠。本文創(chuàng)新點(diǎn)在于對淺埋偏壓段的不等厚二次襯砌的安全性分析,分析可知隨著拱頂以及拱肩位置厚度的減小,二次襯砌的軸力呈遞增的趨勢,而彎矩則呈現(xiàn)出遞減的趨勢,且二次襯砌的安全系數(shù)全部為減小趨勢,襯砌破壞范圍不斷增加。所得結(jié)論可為實(shí)際工程設(shè)計(jì)和施工提供一定的參考,及時(shí)做好支護(hù)和防范工作。
[Abstract]:Based on the Wu-Shen High-speed Jijiapo Tunnel Project, this paper combines the advanced geological forecast with the geological data of the project area and the tunnel design and support scheme. Monitoring measurement and numerical simulation analysis are used to analyze the stability of tunnel surrounding rock. It is a prerequisite to ensure the safety of construction and the stability of surrounding rock in the construction process to predict the geological situation in front. First of all, comparing various kinds of advanced geological forecasting methods, we find that a single method of advanced geological prediction can not predict the geology in front of us very well. It often needs the comprehensive application of various detection methods to make up for their respective shortcomings and form a relatively complete advance prediction of the address to provide a strong guarantee for the construction safety. Jijiapo Tunnel mainly uses geological sketch, TGP and GPR. Monitoring and measuring is an important means to guide construction. By processing and analyzing the collected data, we can effectively predict the stability of surrounding rock, and the collected data often show certain regularity with time and space. Four forms of curves are obtained. According to the criterion of judging the stability of surrounding rock, the stability of surrounding rock of the tunnel can be obtained by analyzing the data. When the tunnel is about 3 times diameter apart from the face of the face, the secondary lining can be applied. In this paper, the influence of different overburden thickness, different excavation sequence of shallow buried section, and no influence of surrounding rock level on deep buried section are analyzed by numerical simulation of finite element software. The influence of different net distance of deep buried section and different construction method of deep buried section. The following conclusions can be obtained: the deformation of surrounding rock increases with the increase of overburden thickness; first excavation of deep buried cavern and then excavation of shallow side cavern are more beneficial to the stability of surrounding rock; the deformation of surrounding rock decreases with the increase of surrounding rock level. The CRD method is the best construction method, and the step method is the most simple one. At the same time, the poor stability of the surrounding rock will seriously affect the safety of the secondary lining, and in the construction process, the top of the secondary lining and the arch shoulder are often not dense because of the concrete filling, resulting in the thickness of the secondary lining is not enough. The innovation of this paper lies in the analysis of the safety of the secondary lining with different thickness in the shallow burying partial pressure section. The analysis shows that the axial force of the secondary lining increases with the decrease of the arch roof and the thickness of the arch shoulder, while the bending moment shows a decreasing trend. And the safety factor of the secondary lining is decreasing, and the damage range of the lining is increasing. The conclusions can provide some references for practical engineering design and construction, and timely support and prevention work.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U451.2

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本文編號：2419593