本文選題：隧道工程 + 塌方��； 參考：《長安大學》2014年碩士論文

【摘要】：塌方是隧道施工中最常見的災害現象之一。目前，隧道塌方問題的研究主要集中于原因分析及處治措施，對塌方腔體周邊圍巖穩(wěn)定性尚未有系統(tǒng)的分析。一般情況下，，隧道塌方處治主要針對大、中型塌方事故，對小型塌方受關注較少，但工程實踐中，大部分的大、中型塌方都是小型塌方沒能得到及時治理而造成的；同時隧道塌方事故中小型塌方所占的比例較大。因此，開展小型塌方腔體周邊圍巖穩(wěn)定性與處治措施研究對保障施工安全具有著重要的指導性意義。本文基于軟弱圍巖隧道塌方的特點，采用統(tǒng)計分析、理論分析與數值模擬相結合的方法，對自重應力場作用下公路隧道塌方腔體周邊圍巖穩(wěn)定性及處治措施進行深入的研究。論文主要工作如下： 1.對無支護條件下與有支護條件下隧道塌方事故進行了分類統(tǒng)計，統(tǒng)計分析的內容主要有塌方腔體形狀、位置、時間節(jié)點、原因以及塌方處治方法。 2.基于統(tǒng)計分析，對無支護條件下隧道拱形塌方進行了數值模擬，分析了塌方腔體周邊圍巖的位移場、應力場以及圍巖塑性區(qū)。 3.基于統(tǒng)計分析，對有支護條件下隧道拱形塌方進行了數值模擬，分析了塌方腔體周邊圍巖的位移場、應力場、圍巖塑性區(qū)以及支護結構受力特征。 4.在無支護條件下與有支護條件下隧道拱形塌方數值模擬分析結果的基礎上，分別依據塌方腔體周邊圍巖塑性區(qū)位置或應力松弛最嚴重部位，對兩種條件下的隧道塌方提出了處治方案，進行了數值模擬分析，得到了不同施工階段下隧道各個部位的位移變化規(guī)律、圍巖塑性區(qū)變化情況、以及支護結構受力特征，并進行了對比分析，對處治方案的處治效果作出評價。
[Abstract]:Collapse is one of the most common disasters in tunnel construction. At present, the study of tunnel collapse mainly focuses on the cause analysis and treatment measures, and there is no systematic analysis on the stability of surrounding rock around the cavern. Generally speaking, the treatment of tunnel collapse is mainly aimed at the large and medium collapse accidents, and less attention is paid to the small collapse, but in engineering practice, most of the large and medium-sized landslides are caused by the failure to get timely treatment of the small landslides. At the same time, the proportion of small and medium-sized landslides in tunnel collapse accidents is larger. Therefore, the research on surrounding rock stability and treatment measures of small cave-in cavity is of important guiding significance to ensure construction safety. Based on the characteristics of soft surrounding rock tunnel collapse, the stability and treatment measures of surrounding rock surrounding tunnel cave-in cavity of highway tunnel under the action of self-gravity stress field are studied in this paper by means of statistical analysis, theoretical analysis and numerical simulation. The main work of the thesis is as follows: 1. In this paper, the tunnel collapse accidents without and with support are classified and counted. The main contents of statistical analysis are the shape, position, time node, cause and treatment method of collapse cavity. 2. Based on statistical analysis, the numerical simulation of tunnel arch collapse is carried out under the condition of no support, and the displacement field, stress field and plastic zone of surrounding rock around cave-in cavity are analyzed. 3. Based on the statistical analysis, the numerical simulation of tunnel arch collapse under the condition of supporting is carried out, and the displacement field, stress field, plastic zone of surrounding rock and the mechanical characteristics of supporting structure are analyzed. 4. On the basis of the numerical simulation results of tunnel arch collapse under the condition of no support and with support, the plastic zone around the cavern or the most serious part of stress relaxation are obtained, respectively. The treatment scheme of tunnel collapse under two kinds of conditions is put forward and the numerical simulation analysis is carried out. The displacement variation law, the plastic zone change of surrounding rock and the mechanical characteristics of supporting structure are obtained under different construction stages. A comparative analysis was made to evaluate the effect of the treatment scheme.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U459.2;U457

【參考文獻】

相關期刊論文 前3條

1 吳夢軍,陳彰貴,許錫賓,趙明階;公路隧道圍巖穩(wěn)定性研究現狀與展望[J];重慶交通學院學報;2003年02期

2 王京春;田s

本文編號：1968367