本文選題：大斷面隧道　切入點(diǎn)：監(jiān)測(cè)數(shù)據(jù)　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：城市地鐵的修建已成為當(dāng)前城市高速化發(fā)展的重要標(biāo)志。伴隨著地鐵的“高、大、寬、淺”發(fā)展趨勢(shì),大斷面隧道不斷涌現(xiàn)。為提高地鐵的便捷性,不可避免地出現(xiàn)上下交叉的隧道,這也擴(kuò)大了新建隧道與已有隧道之間的相互影響。探究大斷面隧道及其與臨近隧道間的相互影響已成為地下工程研究的重要內(nèi)容。本文以哈爾濱地鐵一期工程“哈爾濱南站至農(nóng)科院站”區(qū)間的臨近隧道的大斷面隧道為背景,對(duì)施工過(guò)程中隧道圍巖變形進(jìn)行施工監(jiān)測(cè)和數(shù)值模擬,并對(duì)隧道施工安全風(fēng)險(xiǎn)進(jìn)行評(píng)估。主要的研究?jī)?nèi)容為:(1)對(duì)現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)進(jìn)行整理,得到了地表沉降、拱頂沉降和水平收斂的變化曲線圖,并對(duì)變化規(guī)律進(jìn)行了分析。結(jié)果表明:地表沉降具有一定的規(guī)律,基本符合Peck沉降曲線圖;拱頂沉降與地表沉降表現(xiàn)出了一致性;先開挖的導(dǎo)洞最終沉降量最大,說(shuō)明開挖其他導(dǎo)洞時(shí)對(duì)該位置沉降有一定的影響。(2)采用ANSYS軟件對(duì)大斷面隧道的雙側(cè)壁導(dǎo)坑法的施工過(guò)程進(jìn)行了數(shù)值模擬,分析了在對(duì)每個(gè)導(dǎo)洞開挖時(shí),土體和初期支護(hù)的位移和應(yīng)力的變化狀態(tài)。研究表明:中上導(dǎo)洞開挖時(shí)引起的地表沉降、拱頂沉降和水平收斂變化量最大,且應(yīng)力比較大的區(qū)域主要在拱頂、拱腰和拱腳部分。(3)通過(guò)對(duì)現(xiàn)場(chǎng)隧道風(fēng)險(xiǎn)辨識(shí)可知,臨近隧道之間的影響是施工風(fēng)險(xiǎn)評(píng)估的重點(diǎn)對(duì)象。據(jù)此應(yīng)用肯特指數(shù)法和模糊數(shù)學(xué)法對(duì)臨近隧道的隧道施工風(fēng)險(xiǎn)等級(jí)進(jìn)行了分析和評(píng)估。兩種方法的風(fēng)險(xiǎn)評(píng)估結(jié)果均為中度,說(shuō)明兩種方法在評(píng)估結(jié)論上具有一致性。
[Abstract]:The construction of urban subway has become an important symbol of the high-speed development of the city. With the development trend of "high, large, wide and shallow" of subway, large-section tunnels are emerging constantly. Inevitably, there are tunnels that intersect up and down, This also expands the interaction between the new tunnel and the existing tunnel. Exploring the interaction between the large-section tunnel and its adjacent tunnel has become an important part of the underground engineering research. The large-section tunnel adjacent to the tunnel in the section from Harbin South Station to the Academy of Agricultural Sciences station is the background. The construction monitoring and numerical simulation of tunnel surrounding rock deformation are carried out, and the safety risk of tunnel construction is evaluated. The main research contents are as follows: 1) the site monitoring data are sorted out, and the surface subsidence is obtained. The curve of the vault settlement and horizontal convergence is analyzed. The results show that the surface subsidence has certain rules, which basically accords with the Peck curve, and the dome settlement is consistent with the surface settlement. The final settlement of the first excavated pilot tunnel is the largest, which indicates that the settlement of this position is affected by the excavation of other guideways. (2) the construction process of double-sidewall diversion pit method of large-section tunnel is numerically simulated by using ANSYS software. The variation of displacement and stress of soil mass and initial support during excavation of each pilot tunnel is analyzed. The results show that the surface settlement, vault settlement and horizontal convergence change are the largest during the excavation of the middle and upper pilot tunnel. And the area where the stress is relatively large is mainly in the arch roof, arch waist and arch foot part. The influence between adjacent tunnels is the key object of construction risk assessment. Based on the analysis and evaluation of tunnel construction risk grade by using Kent index method and fuzzy mathematics method, the risk assessment results of both methods are moderate. It shows that the two methods are consistent in the evaluation results.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U456.3;U231.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉蘇寧;;淺談ANSYS在現(xiàn)代設(shè)計(jì)方法中的應(yīng)用[J];機(jī)電技術(shù);2011年02期

2 楊s，

本文編號(hào)：1604102