本文關(guān)鍵詞： 隧道開挖 滑坡變形 穩(wěn)定性　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在我國(guó)現(xiàn)代公路建設(shè)過(guò)程中，有許多隧道修建在山坡體內(nèi)，，這些邊坡或者滑坡常常會(huì)有各種各樣的病害。經(jīng)過(guò)大量的調(diào)查，滑坡的變形破壞與隧道開挖密切相關(guān)，針對(duì)預(yù)防邊坡或滑坡的病害，本文開展了隧道臨近滑坡穩(wěn)定性及隧道變形機(jī)理的研究工作。近年來(lái)，由于引入了強(qiáng)度折減法，采用有限元法對(duì)滑坡穩(wěn)定性分析，可以直接評(píng)估安全系數(shù)（強(qiáng)度折減系數(shù)），并且能夠直觀地描繪出滑坡的應(yīng)力應(yīng)變分布，同時(shí)也可以反映滑坡的漸進(jìn)破壞過(guò)程，由于強(qiáng)度折減法這些特性是獨(dú)一無(wú)二的，所以有限元極限分析法成為近年來(lái)研究的重點(diǎn)。 本文在理論分析的基礎(chǔ)之上，結(jié)合重慶萬(wàn)利萬(wàn)達(dá)項(xiàng)目猴子巖隧道工程實(shí)例，依據(jù)有限元強(qiáng)度折減法理論，針對(duì)隧道在不同開挖方式下對(duì)臨近滑坡穩(wěn)定性影響進(jìn)行研究。主要內(nèi)容包括： ①采用有限元強(qiáng)度折減法計(jì)算邊坡或滑坡穩(wěn)定性安全系數(shù)，是以ANSYS程序自動(dòng)計(jì)算不收斂為滑坡失穩(wěn)狀態(tài)判定依據(jù)，計(jì)算結(jié)果與工程實(shí)際有較好的一致性； ②滑坡在自重應(yīng)力場(chǎng)下，隨著強(qiáng)度折減系數(shù)的增大，坡腳首先產(chǎn)生塑性應(yīng)區(qū)，塑性區(qū)逐漸向坡體上方發(fā)展，塑性應(yīng)變區(qū)面積漸漸增大，直至折減到某一個(gè)值計(jì)算不收斂，這時(shí)模型達(dá)到極限破壞狀態(tài)； ③隨著隧道埋深加大，隧道開挖對(duì)臨近滑坡穩(wěn)定性影響逐漸降低，滑坡穩(wěn)定性還受隧道開挖方式的影響； ④隧道采用全斷面開挖時(shí)，此種開挖方式對(duì)隧道圍巖擾動(dòng)較大，臨近滑坡的變形也會(huì)增大，計(jì)算獲得的安全系數(shù)為2.14，要做好滑坡防護(hù)與治理工作； ⑤隧道采用先左洞再右洞上下臺(tái)階法開挖，計(jì)算獲得的安全系數(shù)為2.196，相比于全斷面開挖滑坡穩(wěn)定性安全系數(shù)增大一些，但仍需在施工過(guò)程中加強(qiáng)監(jiān)控量測(cè)； ⑥隧道采用先右洞再左洞上下臺(tái)階法開挖，計(jì)算獲得的安全系數(shù)為2.224，是三種開挖方式中最大值，這也表明，此種開挖方式對(duì)臨近滑坡穩(wěn)定性影響最小，盡管也會(huì)使滑坡產(chǎn)生一定的塑性應(yīng)變，但是是能夠滿足實(shí)際施工要求的； ⑦隧道開挖與滑坡變形是相互作用的，兩者的關(guān)系密不可分，故數(shù)值分析結(jié)果應(yīng)充分結(jié)合工程實(shí)際，這樣才能使得有限元分析計(jì)算結(jié)果作為實(shí)際施工措施的理論支撐。
[Abstract]:In the process of modern highway construction in China, there are many tunnels built in the hillside, these slopes or landslides often have a variety of diseases, after a large number of investigations. The deformation and failure of landslide is closely related to tunnel excavation. In order to prevent slope or landslide disease, this paper has carried out the research on the stability of tunnel near landslide and the mechanism of tunnel deformation in recent years. Because the strength reduction method is introduced and the stability of landslide is analyzed by finite element method, the safety factor (strength reduction factor) can be directly evaluated, and the distribution of stress and strain of landslide can be described intuitively. At the same time, it can also reflect the gradual failure process of landslide. Because these characteristics of strength reduction method are unique, the finite element limit analysis method has become the focus of research in recent years. On the basis of theoretical analysis, combining with the example of Monkey Rock Tunnel of Wan-li Wanda Project in Chongqing, this paper bases on the theory of finite element strength reduction. The influence of tunnel excavation on the stability of adjacent landslide is studied. The main contents are as follows: 1. Using the finite element strength reduction method to calculate the safety factor of slope or landslide stability is based on the automatic calculation of ANSYS program. The calculation results are in good agreement with the engineering practice. 2 under the gravity stress field, with the increase of the strength reduction coefficient, the slope foot first produces the plastic zone, the plastic zone develops gradually above the slope body, and the area of the plastic strain zone increases gradually. The model does not converge until it is reduced to a certain value, and the model reaches the limit failure state. (3) with the increase of the buried depth of the tunnel, the influence of tunnel excavation on the stability of the adjacent landslide decreases gradually, and the stability of the landslide is also affected by the excavation mode of the tunnel; (4) when the tunnel is excavated with full section, the tunnel surrounding rock will be disturbed greatly by this excavation method, and the deformation of adjacent landslide will also increase. The calculated safety factor is 2.14, so it is necessary to do a good job in landslide protection and treatment. (5) when the tunnel is excavated by the method of first left hole and then right hole, the calculated safety factor is 2.196, which is a little higher than that of the whole section excavation landslide stability safety factor. However, it is still necessary to strengthen the monitoring and measurement in the construction process. 6 the tunnel is excavated by the method of first right hole and then left hole, and the calculated safety factor is 2.224, which is the maximum of the three excavation modes, which also indicates that. This kind of excavation method has the least influence on the stability of the adjacent landslide, although it can make the landslide produce some plastic strain, it can meet the actual construction requirements. 7Tunnel excavation and landslide deformation are interacted, the relationship between them is inseparable, so numerical analysis results should be fully combined with engineering practice. Only in this way can the finite element analysis result be used as the theoretical support of practical construction measures.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455;U418.55

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