宜宾过境高速公路软基处理方案优化设计

发布时间：2018-09-03 16:23

【摘要】：在高速公路设计中,公路经常会遇到穿越一些工程地质条件不良的地带,如宜宾过境高速公路工程项目施工区域就大面积穿越冬水田软土地带。由于软土地基承载力低、变形沉降大、稳定性差,在荷载作用下容易造成道路沉降变形的危害,严重影响道路使用功能,因此科学的选择技术可行、经济合理的软基处理方案,对于节省投资、节约土地、保护资源和确保工程质量等具有重要意义。本文依托正在建设的宜宾过境高速公路西段项目,以K10+630~K10+780段软基处理为工程实例,结合工程实际情况,构建评价指标体系,确定其中影响软基处理方案优化选择的九个指标分别为:工程造价、维修工作量、工期、承载力与沉降、软土厚度、施工条件、生态环境、水环境、空气环境。通过专家打分构建判断矩阵,并建立模型进行处理方案优化选择排序,确定最优软土地基处理方案。针对本项目不同的路段、地形、工程地质条件,分别对各典型堤段进行了优化得到最优软土地基处理方案,并进行方案设计。采用理正岩土软件对各堤段软土地基承载力、沉降和稳定性进行计算验证,计算结果表明处理过后的路基承载力、沉降和稳定性均符合规范要求,证明了方案的技术可行性和经济合理性。
[Abstract]:In the design of freeway, the highway will often meet some bad engineering geological conditions, such as the construction area of Yipin transit highway project will pass through the soft soil zone of winter paddy field in a large area. Due to the low bearing capacity of soft soil foundation, large deformation settlement and poor stability, it is easy to cause the harm of road settlement and deformation under the action of load, which seriously affects the function of road use. Therefore, the scientific choice of technology is feasible, and the soft foundation treatment scheme is economical and reasonable. It is of great significance for saving investment, saving land, protecting resources and ensuring engineering quality. Based on the west section project of Yibin transit expressway under construction, taking the soft foundation treatment of K10 630~K10 780 section as an engineering example and combining the actual situation of the project, this paper constructs an evaluation index system. The nine indexes that affect the optimum selection of soft foundation treatment schemes are determined as follows: engineering cost, maintenance workload, duration, bearing capacity and settlement, soft soil thickness, construction conditions, ecological environment, water environment and air environment. The judgment matrix is constructed by experts, and the model is established to optimize the selection and ranking of treatment schemes, and the optimal soft foundation treatment scheme is determined. According to different sections, topography and engineering geological conditions of the project, the optimal soft soil foundation treatment scheme is obtained by optimizing each typical embankment section, and the scheme design is carried out. The bearing capacity, settlement and stability of soft soil foundation in each embankment are calculated and verified by using the software of rock and soil. The results show that the bearing capacity, settlement and stability of the treated embankment meet the requirements of the code. The technical feasibility and economic rationality of the scheme are proved.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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