本文選題：隧道洞口邊坡　切入點(diǎn)：穩(wěn)定性分析　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隧道洞口段地質(zhì)災(zāi)害嚴(yán)重影響著隧道工程的建設(shè)和運(yùn)營(yíng)，較為突出的是洞口邊仰坡穩(wěn)定性問題。本文以賈家山1號(hào)隧道洞口邊仰坡失穩(wěn)破壞誘發(fā)山體滑坡的工程實(shí)例為研究對(duì)象，運(yùn)用工程類比法、數(shù)值計(jì)算法和現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)分析，對(duì)洞口邊坡穩(wěn)定性、失穩(wěn)影響因素和隧道開挖模型進(jìn)行了較為深入的研究。 現(xiàn)場(chǎng)監(jiān)測(cè)和勘察表明：賈家山1號(hào)隧道洞口邊仰坡失穩(wěn)破壞主要經(jīng)歷了零星破壞、局部破壞和整體破壞三個(gè)階段。綜合分析降雨系數(shù)、施工工序?qū)?yīng)的沉降曲線的相關(guān)性，得出施工期間連續(xù)降雨是洞口邊仰坡失穩(wěn)破壞的主導(dǎo)因素。通過分析類似工程的地表沉降數(shù)據(jù)得出：由降雨引起地表沉降的滯后時(shí)間約在24h~48h之間；施工工序引起的地表沉降量中，核心土開挖引起的地表沉降量相對(duì)最大。 建立賈家山1號(hào)隧道三維模型，通過分析動(dòng)態(tài)施工下洞口區(qū)域的應(yīng)力分布和變形特征得出：隧道施工開挖造成邊仰坡坡腳應(yīng)力集中，出現(xiàn)塑性變形，導(dǎo)致坡體的抗滑力小于下滑力，坡體后緣發(fā)生張拉破壞，誘發(fā)邊坡失穩(wěn)。連續(xù)降雨使土體的含水量增大，土體力學(xué)參數(shù)發(fā)生變化，，這是邊坡失穩(wěn)破壞的主要原因。 根據(jù)賈家山1號(hào)隧道山體仰坡的治理方案，利用簡(jiǎn)化bishop法、janbu法和強(qiáng)度折減法計(jì)算典型滑面的安全系數(shù)分別為1.47、1.466和1.50，治理方案有效的提高了滑坡的安全系數(shù)；通過有限元法搜索出治理后滑坡的潛在滑面和剪出口，主要集中在治理方案中的第二、三級(jí)平臺(tái)處，施工時(shí)此處需加強(qiáng)支護(hù)，并做好防排水措施。
[Abstract]:The geological disasters at the entrance of the tunnel seriously affect the construction and operation of the tunnel project. The problem of slope stability at the entrance of the Dongkou is prominent. This paper takes the engineering example of landslide induced by the instability of the slope at the entrance of Jiajashan No.1 Tunnel as the research object, applies the engineering analogy method, the numerical calculation method and the field monitoring data analysis. In this paper, the slope stability, instability factors and tunnel excavation model are studied. Field monitoring and investigation show that the instability of the slope at the entrance of Jiajashan No.1 Tunnel has experienced three stages: sporadic destruction, local failure and overall destruction. The correlation of rainfall coefficient and settlement curve corresponding to the construction process is analyzed synthetically. It is concluded that continuous rainfall during construction is the main factor of instability and failure of slope on the edge of the hole. By analyzing the surface subsidence data of similar projects, it is concluded that the lag time of surface subsidence caused by rainfall is about 24 h or 48 h; In the surface settlement caused by construction process, the surface settlement caused by core soil excavation is the largest. The three-dimensional model of Jiayashan No.1 Tunnel is established. By analyzing the stress distribution and deformation characteristics of the opening area under dynamic construction, it is concluded that the stress concentration and plastic deformation occur at the foot of the slope caused by the excavation of the tunnel construction. As a result, the slip resistance of slope is smaller than that of slide, and the tension failure occurs at the back edge of slope, which induces slope instability. Continuous rainfall increases the water content of soil and changes the mechanical parameters of soil, which is the main reason of slope instability. According to the control scheme of vertical slope of No. 1 tunnel in Jiajashan, the safety coefficient of typical sliding surface calculated by simplified bishop method and strength reduction method is 1.47 ~ 1.466 and 1.50, respectively. The safety factor of landslide is improved effectively by the control scheme. Through the finite element method, the potential sliding surface and shear outlet of the landslide after treatment are found, which are mainly concentrated in the second and third grade platform of the treatment scheme, where the support should be strengthened and the measures of waterproof and drainage should be done well during construction.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U453.1;U457.2

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