高填方路段公路路基滑坡稳定性分析及整治措施研究

发布时间：2018-06-01 02:21

  本文选题：路基滑坡 + 数值模拟　； 参考：《重庆交通大学》2014年硕士论文

【摘要】：本文针对大足区宝顶石刻景区环线公路K11-K12段破坏型路基滑坡的稳定性分析及整治措施为研究背景,采用定性分析、定量分析及数值模拟等手段对该高填方路基滑坡的稳定性问题进行分析评价并提出切实可行的整治措施。本文的主要研究内容有:1.通过对工程现场的实地勘察,分析研究该滑坡区的地质特征和环境条件,并现场取样通过土工试验得到岩土物理力学参数,为该高填方路基滑坡的稳定性的正确分析和整治方案的合理选择提供了必要的、准确的计算参数。2.通过研究该高填方路基滑坡体的基本形态特征和应力-应变特性,分析其滑坡基本原因,初步评价滑坡破坏机理和滑坡稳定性。3.采用极限平衡法定量分析该滑坡分别在天然条件下和20年一遇降雨工况下的应力应变特征,并通过计算安全系数来进行稳定性分析评价。4.采用严格地Morgenstern-Price法并借助岩土结构稳定性分析通用软件SLOPE/W建立边坡地质模型及数值计算模型,分析该滑坡在天然条件下和20年一遇降雨工况下的应力特征与应变特征,并计算最危险滑动面及最小安全系数,最后进行稳定性分析及评价。5.对极限平衡法分析成果和数值模拟结果进行整理研究,并根据滑坡所在工程条件与稳定性现状,遵循滑坡治理的原则,根据该滑坡破坏模式和宝顶路K11-K12段线路的特点,滑坡治理方案采用“抗滑桩+格构植草护坡+截排水工程”。1-1′剖面为控制性剖面,在道路靠山侧进行抗滑桩支挡工程布置,2-2′剖面、3-3′剖面均为控制性剖面,结合道路线型进行抗滑桩支挡工程布置。对滑坡侧壁及后缘的不稳定岩土体应进行清除,人工清除坡面之后,浇筑钢筋混凝土格构梁,种植草皮护坡;在滑坡边界外侧合理位置设置截水沟,对滑坡体上的拉张裂缝,应采用覆盖或者混凝土填实措施,防止地表水由张拉裂缝进入滑体内。坡脚截排水沟均应设沉降缝,缝内填沥青玛蹄脂油膏,沟内壁用水泥砂浆勾缝。坡底排水沟与道路排水沟结合。6.经过整治的边坡安全系数满足稳定性要求,因此,采取该边坡工程治理措施能够有效应对滑坡变形或失稳对公路带来的灾害隐患。
[Abstract]:Based on the research background of stability analysis and treatment measures of damaged subgrade landslide in K11-K12 section of circular road of Baoding stone carving scenic spot in Dazu district, qualitative analysis is adopted in this paper. The stability of the high embankment landslide is analyzed and evaluated by means of quantitative analysis and numerical simulation. The main content of this paper is: 1. The geological characteristics and environmental conditions of the landslide area are analyzed and studied by field investigation on the site of the project, and the geotechnical physical and mechanical parameters are obtained through geotechnical tests. It provides the necessary and accurate calculation parameter. 2 for the correct analysis of the stability of the high embankment landslide and the reasonable selection of the remediation scheme. By studying the basic morphological characteristics and stress-strain characteristics of the high embankment landslide, the basic causes of the landslide are analyzed, and the failure mechanism and stability of the landslide are preliminarily evaluated. The limit equilibrium method is used to analyze the stress-strain characteristics of the landslide under natural conditions and once in 20 years, respectively, and the safety factor is calculated to evaluate the stability of the landslide. The slope geological model and numerical calculation model are established by using the strict Morgenstern-Price method and the general software SLOPE/W for the stability analysis of rock and soil structure. The stress and strain characteristics of the landslide under natural conditions and once in 20 years rainfall are analyzed. The most dangerous sliding surface and the minimum safety factor are calculated. Finally, the stability analysis and evaluation are carried out. The analysis results and numerical simulation results of limit equilibrium method are analyzed and studied. According to the conditions and stability of the landslide, the principle of landslide treatment is followed, according to the failure mode of the landslide and the characteristics of the K11-K12 section of Baoding Road. The landslide control scheme adopts the section of "anti-slide pile grid planting grass slope protection and drainage engineering". The section of "1-1 'section" is the control section, and the layout of anti-slide pile supporting works on the side of the road to the mountain is all controlled section, the 2-2' section and the section "3-3 'section are all controlled sections." Combined with road alignment, anti-slide pile retaining engineering arrangement is carried out. The unstable rock and soil mass of the side wall and back edge of the landslide should be cleared, after the slope surface is cleared manually, the reinforced concrete lattice beam should be put into place to plant sod to protect the slope, and the reasonable position on the outside of the landslide boundary should be set up in the intercepting ditch to make the tension crack on the landslide body. Cover or concrete fill measures should be used to prevent surface water from tensile cracks into the slip body. At the foot of the slope, the sewer should be set up with settlement joint, the joint should be filled with asphalt maleate ointment, and the inner wall of the ditch should be hooked with cement mortar. Slope bottom drain and road drainage combined. 6. The safety factor of the treated slope can meet the requirements of stability. Therefore, adopting the slope engineering treatment measures can effectively deal with the hazards caused by the landslide deformation or instability on the highway.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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