發(fā)布時(shí)間：2018-10-24 17:04

【摘要】：高速公路改擴(kuò)建過程中勢(shì)必要拆除邊坡原有支護(hù),造成邊坡應(yīng)力重分布,因此在開挖過程中邊坡的穩(wěn)定性處于動(dòng)態(tài)發(fā)展過程中,開挖支護(hù)時(shí)序、施工期內(nèi)的降雨量等對(duì)其均有較大影響。若處理不當(dāng),邊坡極有可能失穩(wěn)破壞。因此,研究開挖過程中的邊坡變形規(guī)律及其穩(wěn)定性,尋求合理的開挖支護(hù)方法及邊坡加固措施,對(duì)于確保改擴(kuò)建邊坡工程的安全穩(wěn)定有著重要意義。論文以柳南高速K1456+800~K1468+300段改擴(kuò)建工程某典型邊坡為依托,以邊坡開挖變形規(guī)律為目標(biāo),以邊坡穩(wěn)定性控制方案為主線,借助離心模型試驗(yàn)、有限元模擬計(jì)算和理論分析等手段,開展了高速公路高邊坡改擴(kuò)建開挖過程穩(wěn)定性研究。論文首先系統(tǒng)分析了影響高速公路高邊坡穩(wěn)定性的影響因素,結(jié)合柳南改擴(kuò)建路段的實(shí)際工況,進(jìn)行了高邊坡開挖穩(wěn)定性影響因素的靈敏度分析,然后采用響應(yīng)面法和蒙特卡羅兩種方法對(duì)巖性參數(shù)內(nèi)聚力c和內(nèi)摩擦角進(jìn)行了可靠度分析。借助長安大學(xué)60gt離心模型試驗(yàn)系統(tǒng),構(gòu)建與實(shí)際應(yīng)力相符的邊坡模型,依靠激光位移傳感器、非接觸式位移監(jiān)測(cè)系統(tǒng)等明確了邊坡開挖過程中的變形過程,揭示了不同開挖支護(hù)時(shí)序下邊坡的穩(wěn)定狀態(tài)的動(dòng)態(tài)發(fā)展規(guī)律;以土工土工離心機(jī)系統(tǒng)為平臺(tái)研發(fā)了降雨裝置,在離心場(chǎng)中實(shí)現(xiàn)了對(duì)降雨過程的模擬,研究了開挖過程中的降雨對(duì)邊坡穩(wěn)定狀態(tài)的影響,以及不同降雨量后邊坡穩(wěn)定狀態(tài)的發(fā)展過程。以柳南高速典型邊坡為原型,進(jìn)行不同施工方法的有限元數(shù)值模擬,分析了不同開挖支護(hù)時(shí)序?qū)吰掳踩禂?shù)、應(yīng)力、位移等的影響。同時(shí)根據(jù)改擴(kuò)建道路拓寬的寬度,確定邊坡開挖后的坡腳點(diǎn),并以此為基準(zhǔn)點(diǎn),利用ADINA有限元計(jì)算軟件,分別建立邊坡開挖比例為1:0.75、1:1及1:1.25的數(shù)值計(jì)算模型,分析不同開挖深度、不同開挖分級(jí)數(shù)對(duì)邊坡安全系數(shù)、應(yīng)力、位移等變量的影響。最后總結(jié)控制邊坡開挖變形的常用施工處治技術(shù)方法,分析了各方法對(duì)應(yīng)的設(shè)計(jì)計(jì)算方法,提出了適合改擴(kuò)建邊坡的合理施工方案,將信息施工技術(shù)有效的應(yīng)用于改擴(kuò)建邊坡穩(wěn)定性控制措施方案中;確定了合理的施工原則,保證了邊坡施工整體性的安全穩(wěn)定,對(duì)后期穩(wěn)定的安全起到重要的作用。
[Abstract]:In the process of highway reconstruction and extension, the original slope support must be removed, which results in the stress redistribution of the slope, so the stability of the slope is in the dynamic development process during the excavation process. Rainfall during construction has great influence on it. If the treatment is not proper, the slope is most likely to lose stability and damage. Therefore, it is of great significance to study the law of slope deformation and its stability during excavation, and to seek reasonable excavation and support methods and slope reinforcement measures to ensure the safety and stability of slope reconstruction and extension projects. Based on a typical slope of Liunan high-speed K1456 800~K1468 300 section, taking the excavation deformation law as the target and the slope stability control scheme as the main line, the paper makes use of centrifugal model test, finite element simulation calculation and theoretical analysis and so on. The stability of highway high slope reconstruction and excavation process is studied. Firstly, the influence factors of high slope stability of expressway are systematically analyzed, and the sensitivity analysis of the influencing factors of excavation stability of high slope is carried out according to the actual working conditions of the extended section of Liunan. Then the reliability of cohesive force c and internal friction angle of lithologic parameters is analyzed by using response surface method and Monte Carlo method. With the aid of the 60gt centrifugal model test system of Changan University, the slope model which is consistent with the actual stress is constructed. The deformation process of the slope during excavation is determined by the laser displacement sensor and the non-contact displacement monitoring system. The dynamic development law of slope stability under different excavation timings is revealed, the rainfall device is developed on the platform of geotechnical centrifuge system, and the rainfall process is simulated in centrifugal field. The influence of rainfall during excavation on slope stability and the development of slope stability after different rainfall are studied. Taking the typical slope of Liunan high speed as the prototype, the finite element numerical simulation of different construction methods is carried out, and the influence of different excavation timings on the safety factor, stress and displacement of the slope is analyzed. At the same time, according to the width of the widening of the reconstruction and extension road, the slope base point after excavation is determined, and by using ADINA finite element calculation software, the numerical calculation models of the slope excavation ratio of 1: 0.75-1: 1 / 1 and 1: 1.25 are established respectively, and the different excavation depth is analyzed. The influence of different excavation classification number on slope safety factor, stress, displacement and so on. At last, it summarizes the common construction treatment methods to control the slope excavation deformation, analyzes the corresponding design and calculation methods of each method, and puts forward a reasonable construction scheme suitable for the reconstruction and expansion of the slope. The information construction technology is effectively applied to the slope stability control scheme of reconstruction and extension, and the reasonable construction principle is determined to ensure the safety and stability of the slope construction as a whole, which plays an important role in the stability of the slope in the later stage.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.14

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本文編號(hào)：2292002