本文選題：香耳山隧道 + 小凈距��； 參考：《西華大學(xué)》2015年碩士論文

【摘要】：在長期山嶺高速公路隧道施工中,隧道洞口段施工往往是整個(gè)施工過程中的困難之處。作為隧道咽喉的洞口段,其最普遍的特征包括:多長期受到風(fēng)化作用,圍巖普遍存在較破碎情況,并且普遍夾雜土層;覆蓋層通常比較薄,且覆蓋層厚度一般不均勻,容易形成淺埋偏壓段。所以在這種成拱效應(yīng)很難發(fā)揮作用的情況下,如何因地制宜的確定施工方案與監(jiān)控量測方案,如何確保安全,如何提高項(xiàng)目建設(shè)的經(jīng)濟(jì)效益,如何在滿足一定工期要求前提下,減少對(duì)圍巖的擾動(dòng),這些問題均急需解決。本文以香耳山小凈距隧道洞口淺埋偏壓段工程為依托,根據(jù)該隧道洞口工程的實(shí)際地形地貌、工程地質(zhì)條件,參考洞口段現(xiàn)場進(jìn)洞實(shí)際方案(選擇三臺(tái)階七步開挖預(yù)留核心土法,深埋側(cè)作為先行洞,淺埋側(cè)作為后行洞,導(dǎo)洞開挖分臺(tái)階先右側(cè)后左側(cè)),提出三個(gè)新的進(jìn)洞方案:同樣選擇三臺(tái)階七步開挖預(yù)留核心土法,但是變換先行洞和后行洞進(jìn)洞順序,以及導(dǎo)洞開挖順序。通過現(xiàn)場監(jiān)控量測技術(shù)與理論數(shù)值模擬研究技術(shù)相互對(duì)比,分析了香耳山小凈距隧道洞口淺埋偏壓段施工動(dòng)態(tài)力學(xué)過程。根據(jù)進(jìn)洞過程中圍巖應(yīng)變的變化規(guī)律、塑性區(qū)分布形態(tài)和發(fā)展規(guī)律、圍巖應(yīng)力特征、初期支護(hù)應(yīng)力變化規(guī)律等方面,研究香耳山小凈距隧道洞口淺埋偏壓段不同進(jìn)洞施工方案對(duì)洞口淺埋偏壓段圍巖穩(wěn)定性的影響機(jī)制。通過對(duì)比分析,得出了選擇三臺(tái)階七步開挖預(yù)留核心土法,深埋側(cè)作為先行洞,淺埋側(cè)作為后行洞,導(dǎo)洞開挖先右側(cè)后左側(cè)(不分臺(tái)階)的開挖方案,是香耳山小凈距隧道洞口淺埋偏壓段較優(yōu)施工方案的結(jié)論。本文探討成果可對(duì)香耳山小凈距隧道洞口淺埋偏壓段工程的施工提供一定指導(dǎo)和建議,并且對(duì)類似山嶺隧道洞口淺埋偏壓段施工方案的確定提供借鑒和參考作用,對(duì)確保安全施工和科學(xué)指導(dǎo)類似隧道洞口工程施工具有一定的意義。
[Abstract]:In the long-term tunnel construction of mountain highway, the construction of tunnel entrance section is often the difficulty in the whole construction process.As the orifice of the tunnel throat, the most common characteristics of the section include: long term weathering, the surrounding rock is generally broken, and generally mixed soil layer, the overburden is usually thin, and the thickness of the overburden is generally uneven.It is easy to form shallow buried bias section.So how to determine the construction plan and the monitoring and measuring scheme, how to ensure the safety, how to improve the economic benefit of the project construction, how to meet the requirements of the construction period under the condition that it is difficult to play the role of the arch effect, and how to determine the construction plan and the monitoring and measuring scheme according to the local conditions.To reduce the disturbance of surrounding rock, these problems need to be solved urgently.In this paper, based on the shallow burying partial pressure section of the small distance tunnel entrance of Xiangershan tunnel, according to the actual topography and geomorphology and the engineering geological conditions of the tunnel entrance project,Referring to the actual scheme of hole entry in the section of Dongkou (selecting three steps and seven steps to excavate the reserved core soil method, the deep buried side is used as the first tunnel, the shallow side as the rear tunnel, and the shallow side as the rear tunnel).In this paper, three new excavation schemes are put forward: selecting three steps and seven steps of excavation to reserve the core soil, but changing the order of advance and backward holes, as well as the excavation sequence of guide holes.Based on the comparison of field monitoring and measurement technology and theoretical numerical simulation technology, the dynamic mechanical process of shallow burying bias section of Xiangershan small distance tunnel is analyzed.According to the variation law of surrounding rock strain, the distribution and development law of plastic zone, the stress characteristics of surrounding rock, the variation law of initial support stress, etc.This paper studies the influence mechanism of different tunnel entry schemes on the stability of surrounding rock of shallow buried eccentric section of Xiangershan small distance tunnel.Through comparison and analysis, the excavation scheme of selecting three steps and seven steps to excavate the core soil method, the deep buried side as the first tunnel, the shallow side as the rear tunnel, the guide tunnel excavation first on the right side and then on the left side (without steps) is obtained.It is the conclusion of the optimal construction scheme for the shallow buried bias section at the entrance of the small clear distance tunnel in Xiangershan.The results of this paper can provide some guidance and suggestions for the construction of shallow burying partial pressure section at the entrance of Xiangershan small distance tunnel, and provide reference and reference for the determination of the construction scheme of shallow buried bias section at the entrance of similar mountain tunnel.It has certain significance for ensuring safety construction and guiding similar tunnel entrance construction scientifically.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4

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