本文選題：高速公路改擴(kuò)建　切入點(diǎn)：高邊坡　出處：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)的飛速發(fā)展,很多既有道路已不能滿足交通量飛速增長(zhǎng)的需求,因此,亟需對(duì)一些既有道路進(jìn)行修復(fù)與改擴(kuò)建。在道路改擴(kuò)建路塹高邊坡施工時(shí),不可避免要對(duì)原有邊坡進(jìn)行二次開挖,而二次開挖會(huì)對(duì)原坡體造成進(jìn)一步擾動(dòng),若處理不當(dāng),則很有可能造成坡體失穩(wěn),影響高速公路運(yùn)營(yíng)安全。因此,如何避免邊坡在二次開挖過(guò)程中發(fā)生失穩(wěn)就成為高速公路改擴(kuò)建工程高邊坡施工中的關(guān)鍵問題之一。本文以廣西桂柳南高速公路改擴(kuò)建工程K1431+380左側(cè)高邊坡為工程實(shí)例,首先采用靈敏度及正交試驗(yàn)分析方法對(duì)影響該邊坡穩(wěn)定性的各因素進(jìn)行敏感性分析；然后采用FLAC 3D軟件建立相應(yīng)數(shù)值分析模型,優(yōu)化該邊坡的開挖施工工藝,并對(duì)該邊坡二次開挖施工的過(guò)程穩(wěn)定性進(jìn)行深入系統(tǒng)研究,提出合理可靠的邊坡加固方案,為工程實(shí)踐提供參考。本文主要的研究?jī)?nèi)容及成果如下：(1)基于正交試驗(yàn)設(shè)計(jì),對(duì)K1431+380高邊坡穩(wěn)定性影響因素靈敏度進(jìn)行相應(yīng)計(jì)算,得到影響向該邊坡穩(wěn)定性各因素敏感性大小關(guān)系為：邊坡平均傾角邊坡坡高巖土體禮平均內(nèi)摩擦角巖土體平均重度邊坡開挖分級(jí)數(shù)巖土體平均粘聚力。(2)通過(guò)對(duì)K1431+380高邊坡按不同比例及不同開挖深度開挖進(jìn)行數(shù)值模擬,認(rèn)為邊坡的穩(wěn)定性對(duì)開挖坡比較敏感。當(dāng)固定開挖坡比時(shí),邊坡的安全系數(shù)Fs在每級(jí)開挖深度為10m時(shí)達(dá)到最大,說(shuō)明每級(jí)開挖10m對(duì)邊坡的穩(wěn)定性最好；最后認(rèn)為邊坡的安全系數(shù)與每級(jí)開挖深度的大小并不是單純的呈線性關(guān)系,而是存在一個(gè)最佳的開挖深度使得邊坡穩(wěn)定性達(dá)到最好。(3)通過(guò)對(duì)K1431+380高邊坡開挖過(guò)程進(jìn)行數(shù)值模擬,認(rèn)為當(dāng)邊坡開挖完第三步后及時(shí)支護(hù)能使其穩(wěn)定性達(dá)到最佳。由此得出結(jié)論：邊坡施工期存在一個(gè)最佳支護(hù)時(shí)機(jī),即最關(guān)鍵的防護(hù)時(shí)步,在該最佳時(shí)機(jī)對(duì)邊坡及時(shí)進(jìn)行支護(hù)會(huì)使邊坡在施工期的穩(wěn)定性達(dá)到最佳。
[Abstract]:With the rapid development of China's economy, many existing roads can no longer meet the demand of rapid growth of traffic volume. Therefore, it is urgent to repair and rebuild some existing roads. It is inevitable to carry on the second excavation to the original slope, and the second excavation will cause further disturbance to the original slope body. If the treatment is not proper, it will probably cause the slope body to lose stability and affect the highway operation safety. How to avoid the instability of the slope during the second excavation is one of the key problems in the construction of the high slope in the expressway reconstruction and extension project. This paper takes the K1431 380 high slope on the left side of Guangxi Gui-Liunan Expressway Reconstruction and extension Project as an engineering example. The sensitivity analysis and orthogonal test method are used to analyze the factors that affect the stability of the slope, and the corresponding numerical analysis model is established by using FLAC 3D software to optimize the excavation construction technology of the slope. The stability of the slope during the secondary excavation construction is studied systematically, and a reasonable and reliable slope reinforcement scheme is put forward, which provides a reference for engineering practice. The main research contents and results of this paper are as follows: 1) based on orthogonal test design, The sensitivity of the factors affecting the stability of the K1431 380 high slope is calculated. The sensitivity of the factors affecting the stability of the slope is obtained as follows: average slope slope slope high rock soil, average internal friction rock soil mass, average serious slope excavation grade, average cohesive force of rock and soil mass, average cohesion of rock and soil through K1431. The excavation of 380 high slope is simulated according to different proportion and different excavation depth. It is considered that the slope stability is more sensitive to the excavation slope. When the excavation slope ratio is fixed, the slope safety factor Fs reaches the maximum when the excavation depth of each stage is 10 m, which indicates that the slope stability is best when the excavation depth is 10 m per stage. Finally, it is concluded that the safety factor of the slope is not only linearly related to the excavation depth of each stage, but that there is an optimal excavation depth to make the slope stability reach the best.) the excavation process of the K1431,380 high slope is simulated numerically. It is considered that the stability of the slope can be optimized by timely supporting after the third step of excavation, and it is concluded that there is an optimal time to support the slope during the construction period, that is, the most critical time step of protection. The stability of the slope during the construction period can be optimized by supporting the slope in time.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.14

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本文編號(hào)：1654362