發(fā)布時(shí)間：2018-11-25 15:02

【摘要】：上世紀(jì)90年代我國(guó)高速公路修建進(jìn)入了飛速發(fā)展的時(shí)期,近年來隨著經(jīng)濟(jì)的發(fā)展與交通量的持續(xù)增加,早期修建的高速公路已無法滿足通行要求,因此,必須對(duì)高速公路進(jìn)行改建或擴(kuò)建。改擴(kuò)建工程中,既有高邊坡的二次開挖需破除原邊坡支護(hù)結(jié)構(gòu),引起原邊坡應(yīng)力場(chǎng)的變化,易導(dǎo)致邊坡失穩(wěn)破壞的特點(diǎn)。本文以惠深高速公路惠州段改擴(kuò)建工程為依托,采用現(xiàn)場(chǎng)調(diào)研、理論分析、數(shù)值模擬等方法展開研究,主要研究成果如下:(1)對(duì)惠深高速公路沿線邊坡的區(qū)域環(huán)境進(jìn)行了調(diào)查分析,初步掌握了既有高邊坡與二次開挖高邊坡的分布情況及其基本信息,分析了高邊坡的幾何尺寸、地質(zhì)條件與防護(hù)形式的統(tǒng)計(jì)特征,并調(diào)查了沿線高邊坡在施工過程中發(fā)生的病害。(2)結(jié)合現(xiàn)場(chǎng)調(diào)查與分析邊坡基本資料的基礎(chǔ)上,選取K22+220~K22+460(左側(cè))高邊坡作為典型高邊坡,分析了既有高邊坡二次開挖穩(wěn)定性影響因素,確定了該邊坡的破壞模式為“滑移-拉裂”破壞,計(jì)算了兩種破裂面下該邊坡穩(wěn)定性。(3)針對(duì)高速公路加寬改擴(kuò)建過程中高邊坡二次擾動(dòng)的問題,采用數(shù)值模擬的方法,在分析典型邊坡初始應(yīng)力場(chǎng)的基礎(chǔ)上,研究不同開挖階段的安全系數(shù)、變形特征和應(yīng)力場(chǎng)的變化規(guī)律。研究成果表明:此類高邊坡在二次開挖過程中,坡腳剪應(yīng)力集中,出現(xiàn)剪出破壞,坡頂存在拉應(yīng)力,坡頂后一定距離會(huì)出現(xiàn)張拉裂縫。在一級(jí)坡腳和三級(jí)坡腳出現(xiàn)塑形區(qū),塑性區(qū)依附于坡角順傾結(jié)構(gòu)面,形成呈中下部為平面與上部似圓弧面組合形態(tài)的最危險(xiǎn)滑裂面。(4)在分析二次開挖特殊性的基礎(chǔ)上,提出了適用于既有高邊坡二次開挖施工的原則與工藝,并從信息化施工和排水系統(tǒng)兩個(gè)角度減少安全隱患。
[Abstract]:The expressway construction in China entered a period of rapid development in the 1990s. With the development of economy and the continuous increase of traffic volume in recent years, the expressway built in the early period could not meet the traffic requirements. The highway must be rebuilt or expanded. In the reconstruction and extension project, the secondary excavation of the existing high slope needs to break down the original slope support structure, which causes the change of the original slope stress field and easily leads to the instability and failure of the slope. Based on the reconstruction and extension project of Huizhou section of Hui-Shen Expressway, this paper adopts field investigation, theoretical analysis, numerical simulation and other methods to carry out the research. The main research results are as follows: (1) the regional environment of the slope along the Hui-Shen expressway is investigated and analyzed, and the distribution and basic information of the existing high slope and the secondary excavated high slope are preliminarily grasped. The geometric dimensions, geological conditions and the statistical characteristics of the protection form of the high slope are analyzed, and the diseases occurring in the construction process of the high slope along the line are investigated. (2) based on the field investigation and analysis of the basic data of the slope, The K22 220~K22 460 (left side) high slope is selected as a typical high slope. The factors affecting the stability of the existing high slope are analyzed, and the failure mode of the slope is determined to be "slip-tension crack" failure. The stability of the slope under two kinds of fracture surfaces is calculated. (3) aiming at the secondary disturbance of high slope during the widening and extension of expressway, the numerical simulation method is used to analyze the initial stress field of typical slope. The safety factor, deformation characteristics and stress field of different excavation stages are studied. The research results show that during the second excavation of this kind of high slope, shear stress concentration at the foot of the slope, shearing failure, tensile stress at the top of the slope and tension cracks will occur at a certain distance after the slope top. The plastic zone appears at the first and third slope feet, and the plastic zone is attached to the inclined structural surface of the slope angle, forming the most dangerous sliding crack surface in the form of the combination of the middle and lower part of the slope and the upper arc surface. (4) based on the analysis of the particularity of the secondary excavation, The principle and technology suitable for secondary excavation of existing high slope are put forward, and the hidden danger of safety is reduced from two aspects of information construction and drainage system.
【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】：2016
【分類號(hào)】：U416.14

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