發(fā)布時(shí)間：2018-05-24 21:42

  本文選題：群洞 + 大跨度��； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：本文以重慶紅巖村隧道洞口段為工程背景，通過數(shù)值模擬的方法，對(duì)大跨度小凈距群洞的施工力學(xué)行為進(jìn)行相關(guān)研究，通過對(duì)比不同開挖方法、不同開挖順序下圍巖及支護(hù)結(jié)構(gòu)的應(yīng)力、應(yīng)變確定群洞最優(yōu)的開挖方法和開挖順序。本論文主要研究工作具體如下： ①通過對(duì)紅巖村群洞下部地鐵車站隧道采用不同開挖方法時(shí)圍巖及支護(hù)結(jié)構(gòu)力學(xué)行為的對(duì)比確定車站隧道采用雙側(cè)壁導(dǎo)坑法優(yōu)于CRD法。 ②通過對(duì)紅巖村群洞上部分別位于巖石和土層中的大跨度小凈距隧道采用不同開挖順序、不同開挖方法時(shí)圍巖及支護(hù)結(jié)構(gòu)力學(xué)行為的對(duì)比得到結(jié)論：先開挖上部左側(cè)巖石中的隧道時(shí)，車站隧道和左行車道隧道都采用雙側(cè)壁導(dǎo)坑法為最優(yōu)的開挖方法；先開挖上部右側(cè)土層中的隧道時(shí)，車站隧道和右行車道隧道都采用雙側(cè)壁導(dǎo)坑法為最優(yōu)的開挖方法。 ③綜合分析紅巖村進(jìn)口群洞在不同開挖方法、開挖順序下，群洞間圍巖、支護(hù)結(jié)構(gòu)的受力和變形相互作用規(guī)律，得到群洞上部先開挖左側(cè)巖石隧道，后開挖右側(cè)土層隧道為最優(yōu)的開挖順序。 ④針對(duì)紅巖村進(jìn)口群洞在上部左側(cè)巖石隧道先行的開挖順序下，左行車道隧道采用雙側(cè)壁導(dǎo)坑法、右行車道隧道采用CRD法為兩洞室最合理的施工工法。
[Abstract]:In this paper, based on the engineering background of Hongyan Village Tunnel in Chongqing, through numerical simulation, the construction mechanics behavior of large span and small clearance tunnel is studied, and the different excavation methods are compared. The stress and strain of surrounding rock and supporting structure under different excavation order determine the optimal excavation method and excavation sequence of group holes. The main research work of this thesis is as follows: The main results are as follows: (1) by comparing the mechanical behavior of surrounding rock and supporting structure of subway station tunnel in the lower part of Hongyancun tunnel with different excavation methods, it is confirmed that the double-sidewall tunnel method is superior to CRD method. (2) different excavation sequence is adopted for the tunnel with large span and small clear distance located in the rock and soil layer in the upper part of the hole in Hongyan Village Group, respectively. Comparing the mechanical behavior of surrounding rock and supporting structure with different excavation methods, it is concluded that when excavating the tunnel in the upper left rock, both the station tunnel and the left carriageway tunnel adopt the double-sidewall tunnel method as the optimal excavation method. When the tunnel in the upper right soil layer is first excavated, both the station tunnel and the right carriageway tunnel are excavated with double-sidewall guide pit method as the optimal excavation method. (3) comprehensively analyzing the interaction law of stress and deformation of surrounding rock and supporting structure between the surrounding rock and supporting structure in the different excavation methods of the entrance group tunnel in Hongyan Village, and obtaining the first excavation of the left rock tunnel in the upper part of the group tunnel. After excavation of the right soil tunnel is the optimal excavation sequence. (4) according to the excavation sequence of the upper left rock tunnel in Hongyan Village entrance tunnel, the double sidewall tunnel method is adopted in the left lane tunnel and the CRD method is adopted in the right lane tunnel as the most reasonable construction method for the two caverns.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.4

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本文編號(hào)：1930657