發(fā)布時間：2018-04-10 14:50

  本文選題：隧道 + 大斷面軟弱圍巖��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：在山嶺隧道軟弱圍巖隧道的開挖工法中,由臺階法延伸出的三臺階七步開挖工法因其獨(dú)特的優(yōu)勢,應(yīng)用越來越多。然而對于三臺階七步工法的主要施工參數(shù)研究還不夠深入,這仍是軟弱圍巖大斷面隧道中亟待進(jìn)一步研究的重要課題。 本文以吉林省延吉地區(qū)富巖1號隧道(V級圍巖)為工程背景,通過理論分析與數(shù)值模擬相結(jié)合的研究方法對V級大斷面軟弱圍巖的施工技術(shù)方案和技術(shù)參數(shù)進(jìn)行了研究,為本項(xiàng)目和相關(guān)隧道工程的設(shè)計施工提供一定的借鑒和指導(dǎo)作用。主要研究內(nèi)容包括： (1)總結(jié)軟弱圍巖大斷面隧道的分類標(biāo)準(zhǔn)、發(fā)展現(xiàn)狀和基本力學(xué)特征,分析三臺階七步開挖法在軟弱圍巖大斷面隧道中的適用性,為研究三臺階七步開挖的施工技術(shù)參數(shù)做鋪墊； (2)介紹三臺階七步開挖法的施工工藝,確定主要研究的施工技術(shù)參數(shù)為臺階長度和上臺階高度,選擇不同工況進(jìn)行數(shù)值模擬,得到三臺階七步開挖工法下隧道的各方向位移、初噴混凝土的第一主應(yīng)力、鋼拱架和鎖腳錨管的最大壓應(yīng)力結(jié)果,并進(jìn)行對比分析獲得所研究施工參數(shù)對隧道的影響規(guī)律； (3)在研究了臺階長度和上臺階高度對初期支護(hù)變形和受力的影響規(guī)律后,本文進(jìn)一步研究了開挖進(jìn)尺的增大對隧道的影響,并選取了同時改變兩個施工參數(shù)的多個工況,對參數(shù)的組合進(jìn)行數(shù)值模擬,得到不同工況下的隧道的變形和受力。通過對不同工況的模擬結(jié)果進(jìn)行對比分析,可以得到參數(shù)組合變化對隧道的影響規(guī)律。對比參數(shù)組合時,目的是在隧道的變形和位移沒有增加的前提下,開挖進(jìn)尺可以得到增加,開挖進(jìn)尺增大就有利于縮短工期,降低成本。
[Abstract]:In the excavation method of weak surrounding rock tunnel in Shanling tunnel, the three-step seven-step excavation method extended from step method has been applied more and more because of its unique advantages.However, the study on the main construction parameters of the three-step and seven-step construction method is not deep enough, which is still an important subject for further study in the large-section tunnel of weak surrounding rock.Based on the engineering background of Fuyan No. 1 tunnel in Yanji region of Jilin Province, this paper studies the construction technical scheme and technical parameters of soft surrounding rock of V-class large section by combining theoretical analysis with numerical simulation.To provide some reference and guidance for the design and construction of this project and related tunnel engineering.The main research contents include:1) summing up the classification standard of large section tunnel of soft surrounding rock, developing present situation and basic mechanical characteristics, analyzing the applicability of three-step and seven-step excavation method in large-section tunnel of soft surrounding rock, paving the way for studying the construction technical parameters of three-step and seven-step excavation;The construction technology of three-step and seven-step excavation method is introduced. The main construction technical parameters are determined as step length and step height. Different working conditions are selected for numerical simulation, and the displacement of each direction of the tunnel under the three-step seven-step excavation method is obtained.The first principal stress of initial shotcreting concrete, the maximum compressive stress of steel arch frame and anchor pipe with locking foot are obtained, and the influence of the construction parameters on the tunnel is obtained by comparing and analyzing.After studying the influence of the length of step and the height of upper step on the deformation and force of the initial support, this paper further studies the influence of the increase of the scale of excavation on the tunnel, and selects several working conditions that change the two construction parameters simultaneously.Numerical simulation of the combination of parameters is carried out to obtain the deformation and force of the tunnel under different working conditions.By comparing and analyzing the simulation results of different working conditions, the influence of the parameter combination on the tunnel can be obtained.When comparing the parameters, the aim is that the excavation advance can be increased without increasing the deformation and displacement of the tunnel, and the increase of the excavation advance will help to shorten the construction period and reduce the cost.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 汪文俊;史翔;;隧道施工中軟弱圍巖的預(yù)支護(hù)方法[J];才智;2010年17期

2 雷軍,和萬春;大跨度軟巖公路隧道短臺階七步平行流水作業(yè)施工技術(shù)[J];公路;2001年04期

3 黃蓉;;軟弱圍巖大斷面隧道三臺階施工力學(xué)機(jī)理分析[J];公路交通科技(應(yīng)用技術(shù)版);2011年04期

4 傅才芝;;三臺階七步開挖法在蘭渝鐵路白家坡隧道中的應(yīng)用[J];甘肅水利水電技術(shù);2010年09期

5 李創(chuàng)軍;柯以茂;;大斷面黃土隧道弧形導(dǎo)坑三臺階七步開挖施工技術(shù)研究[J];公路交通科技(應(yīng)用技術(shù)版);2013年11期

6 何永勝;;三臺階七步開挖法在V級圍巖隧道中的應(yīng)用[J];黑龍江交通科技;2010年04期

7 崔小鵬;孫韶峰;王廣宏;侯敏;;CRD工法及三臺階七步開挖工法的對比和改進(jìn)[J];隧道建設(shè);2010年02期

8 關(guān)寶樹;;軟弱圍巖隧道變形及其控制技術(shù)[J];隧道建設(shè);2011年01期

9 閆玉湛;邵珠山;王新宇;;軟弱圍巖隧道開挖方案優(yōu)化研究[J];交通標(biāo)準(zhǔn)化;2012年05期

10 李勇;孫鋒;;三臺階法在高速鐵路山嶺隧道淺埋段中的應(yīng)用[J];山西建筑;2010年04期

相關(guān)博士學(xué)位論文 前3條

1 趙勇;隧道軟弱圍巖變形機(jī)制與控制技術(shù)研究[D];北京交通大學(xué);2012年

2 文競舟;隧道初期支護(hù)力學(xué)分析及參數(shù)優(yōu)化研究[D];重慶大學(xué);2012年

3 黃強(qiáng);基于黏彈性理論的隧道圍巖應(yīng)力分析研究[D];武漢理工大學(xué);2012年

，

本文編號：1731662