丽攀高速某昔格达高填方路堤稳定性研究

发布时间：2018-09-06 13:41

【摘要】：丽攀高速公路华坪荣将至攀枝花GK3+565.27～GK3+625.25段所在地区位于四川省西南部攀枝花市境内,为昔格达高填方斜坡路堤,由于昔格达地层岩土遇水软化甚至崩解的特性,因此在高填方路段会直接影响到路堤的稳定性,关系到投资效益和工程安全,显然开展昔格达地层高填方路堤稳定性研究具有重要的理论和实践意义。论文首先通过试验(含水率、密度、最优含水率、单轴压缩)研究了昔格达岩土作为填料的基本工程性质,选取了较合理的施工方法。在工程施工完成后,通过布置监测点,对该路段进行较长时期的监测研究,依据地表位移监测结果,对路堤沉降及稳定性进行趋势分析。运用瑞典条分法,毕晓普法以及有限元数值分析法等多种方法对路堤边坡的稳定性进行计算：结合工程实际,得到了拟设抗滑桩部位的设计推力和桩体受力状态。态。针对路堤边坡大变形、不均匀沉降(2014年7月12日斜坡路堤出现变形：左幅路而出现4条纵向裂缝,朽幅路面出现1条纵向裂缝,左侧路堤已发生变形、沉降、最大沉降量23mm、护坡坍陷、坡脚处局部冒顶,局部挡土板变形,8根抗滑桩出现位移,其位移量7～13mam。且斜坡路堤变形情况继续恶化,变形速度加快,针对这种情况提出了反压护道的治理措施,最后采用FLAC3D软件进行数值模拟,对治理措施的合理性和可靠性进行了分析评价。
[Abstract]:The area from Huaping Rong to GK3 565.27~GK3 625.25 of Li-Pan Expressway is located in Panzhihua City, southwest of Sichuan Province. It fills the slope embankment of Xigeda high, because of the softening and even disintegration of Xigeda formation rock and soil. Therefore, the stability of embankment will be directly affected in the section of high fill, which is related to the benefit of investment and the safety of engineering. It is obviously of great theoretical and practical significance to study the stability of high fill embankment in Xigeda formation. Firstly, the basic engineering properties of Xigeda rock and soil as fillers are studied by test (moisture content, density, optimal moisture content, uniaxial compression), and a more reasonable construction method is selected. After the completion of the project, monitoring points are arranged to monitor the section for a long period of time. Based on the monitoring results of surface displacement, the settlement and stability of embankment are analyzed. The stability of embankment slope is calculated by using Swedish slice method, Bixiaopu method and finite element numerical analysis method. Combined with engineering practice, the design thrust and the stress state of pile body are obtained. State. According to the large deformation of embankment slope and uneven settlement (on July 12, 2014, there are 4 longitudinal cracks on the left side road, 1 longitudinal crack on the decadent road surface, deformation and settlement of the left embankment. The maximum settlement is 23mm, the slope collapse, the local roof fall at the foot of the slope, the deformation of local retaining plate and the displacement of 8 anti-slide piles, the displacement of which is 70.13mam. Moreover, the deformation of slope embankment continues to deteriorate and the deformation speed accelerates. In view of this situation, the treatment measures of anti-pressure retaining road are put forward. Finally, the rationality and reliability of the treatment measures are analyzed and evaluated by using FLAC3D software to carry out numerical simulation.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.12

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