本文關(guān)鍵詞： TBM 深埋隧洞 圍巖穩(wěn)定 襯砌管片 位移 應(yīng)力 數(shù)值模擬　出處：《浙江工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：圍巖穩(wěn)定性評(píng)價(jià)是指導(dǎo)地下工程安全施工的重要環(huán)節(jié)。隨著TBM法施工在深埋隧洞中較傳統(tǒng)鉆爆法技術(shù)和經(jīng)濟(jì)優(yōu)勢(shì)的體現(xiàn),針對(duì)深埋隧洞的施工特點(diǎn),如何確保TBM開(kāi)挖過(guò)程中的圍巖穩(wěn)定成為巖土工程研究的熱點(diǎn)和難點(diǎn)之一,對(duì)工程安全施工具有重要的意義。 本文以山西中部引黃工程總干3#輸水隧洞為工程實(shí)例,對(duì)巖土體的彈塑性分析理論進(jìn)行研究并對(duì)TBM掘進(jìn)過(guò)程中影響圍巖穩(wěn)定性的因素進(jìn)行總結(jié)；采用有限元差分軟件FLAC3D建立了TBM法施工隧洞圍巖的數(shù)值仿真計(jì)算模型,選取施工仿真模擬所需巖體物理力學(xué)參數(shù),針對(duì)埋深、側(cè)壓系數(shù)、內(nèi)摩擦角、洞徑等因素對(duì)隧洞圍巖穩(wěn)定性的影響進(jìn)行了計(jì)算分析；對(duì)開(kāi)挖過(guò)程進(jìn)行數(shù)值模擬,分析了不同工況條件下圍巖和襯砌管片的位移、應(yīng)力及演化規(guī)律；討論比較不同圍巖應(yīng)力釋放率對(duì)圍巖及襯砌管片受力特性的影響；同時(shí)分析了圍巖和襯砌管片的變形及應(yīng)力隨掌子面推進(jìn)的變化規(guī)律。分析結(jié)論可為總干隧洞及同類工程的合理設(shè)計(jì)和安全施工提供參考。
[Abstract]:The evaluation of surrounding rock stability is an important link to guide the safe construction of underground engineering. With the embodiment of TBM construction in deep buried tunnel compared with the traditional drilling and blasting technology and economic advantages, the construction characteristics of deep buried tunnel are pointed out. How to ensure the stability of surrounding rock in the process of TBM excavation has become one of the hot and difficult points in geotechnical engineering, which is of great significance to the safe construction of engineering. In this paper, the elastic-plastic analysis theory of rock and soil mass is studied by taking the tunnel of the main trunk of Shanxi Yellow River diversion Project as an example, and the factors influencing the stability of surrounding rock in the process of TBM tunneling are summarized. The finite element difference software FLAC3D is used to establish the numerical simulation model of surrounding rock mass in tunnel construction by TBM method. The physical and mechanical parameters of rock mass required by construction simulation simulation are selected, aiming at the buried depth and lateral pressure coefficient. The influence of internal friction angle and diameter on the stability of surrounding rock is calculated and analyzed. Numerical simulation of the excavation process is carried out, and the displacement, stress and evolution of surrounding rock and lining segment under different working conditions are analyzed. The effects of stress release rate of surrounding rock on the mechanical characteristics of surrounding rock and lining segment are discussed and compared. At the same time, the variation law of deformation and stress of surrounding rock and lining segment with the advancing of face surface is analyzed. The conclusion of the analysis can provide a reference for the rational design and safe construction of the general tunnel and similar projects.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV554;TV223

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