土质边坡的稳定性分析与治理技术研究

发布时间：2018-07-10 19:24

本文选题：土质边坡 + 数值模拟　；参考：《南京大学》2014年硕士论文

【摘要】：在我国经济建设和西部大开发进程中,高速公路建设对于带动地方经济的发展具有重要作用。西部省份许多高速公路需穿越群山峻岭及丘陵地带,其地质环境较为复杂,在高速公路建设中诱发一些环境岩土工程问题,给高速公路建设带来很大的困难,同时也提出了一些新的岩土工程课题,高度公路路堑边坡的稳定性问题即为其中之一。本文以湖南汝郴高速公路土建工程C12合同2号边坡综合防护工程为依托,通过理论分析、现场工程地质勘察、数值模拟和现场监测相结合的方法,对2号边坡的稳定性进行分析,并提出了治理措施。本论文的主要工作有： (1)在广泛阅读国内外有关研究资料,系统的阐述了岩土体边坡稳定性的分析方法,分析了影响边坡稳定性的因素,讨论了几种边坡工程常用的支护方法及其适用条件。从而为边坡稳定性的分析及选择经济合理的边坡支护方案提供技术支撑。 (2)运用岩土工程勘察技术查明边坡工程地质条件,采用极限平衡理论对边坡的稳定性进行评价。计算结果表明,未经加固治理的边坡安全系数仅为Fs=0.49,显然边坡处于不稳定状态。 (3)论文针对该边坡工程的特点,给出了边坡加固治理方案,即自旋锚管+钢丝网+喷射混凝土层的加固方案,并采用极限平衡法对加固治理后的边坡稳定性进行评价,计算结果表明加固后的边坡的安全系数为Fs=1.425,可以满足相关规范要求。 (4)为了进一步分析这一加固治理方案的可行性,论文还采用岩土数值模拟有限元软件MIDAS对加固后边坡稳定性进行计算分析,数值模拟结果显示加固后的边坡的安全系数为Fs=1.425,可以满足工程安全及相关规范要求,该边坡加固方案是可行的。 (5)制定边坡加固方案施工技术措施及现场监测方案,边坡施工现场监测结果表明,加固治理后的边坡最大变形量在变形允许范围之内,边坡处于稳定状态。充分表明这一边坡加固方案是行之有效的,可为类似工程提供技术参考。
[Abstract]:In the process of economic construction and western development in China, highway construction plays an important role in driving the development of local economy. Many highways in the western provinces need to pass through the mountains and hilly areas, and their geological environment is relatively complex. Some environmental geotechnical engineering problems are induced in the expressway construction, which brings great difficulties to the highway construction. At the same time, some new geotechnical engineering problems are put forward, one of which is the stability of high-altitude highway cutting slope. Based on the C12 contract No. 2 Slope Comprehensive Protection Project of Hunan Ru-Chen Expressway, through theoretical analysis, field engineering geological survey, numerical simulation and on-site monitoring, the paper combines the methods of theoretical analysis, field engineering geological survey, numerical simulation and on-site monitoring. The stability of slope No. 2 is analyzed, and the treatment measures are put forward. The main work of this paper is as follows: (1) in the extensive reading of domestic and foreign related research materials, the analysis method of rock and soil slope stability is systematically expounded, and the factors influencing slope stability are analyzed. Several common supporting methods and their applicable conditions for slope engineering are discussed. Therefore, it provides technical support for the analysis of slope stability and the selection of economic and reasonable slope support schemes. (2) using geotechnical engineering survey technology to find out the slope engineering geological conditions, The limit equilibrium theory is used to evaluate the slope stability. The calculated results show that the safety factor of the unreinforced slope is only 0.49, obviously the slope is in an unstable state. (3) according to the characteristics of the slope engineering, the paper gives the slope reinforcement treatment scheme. That is, the reinforcement scheme of spin-anchor pipe steel wire mesh sprayed concrete layer, and the ultimate equilibrium method is used to evaluate the stability of the slope after reinforcement and treatment. The calculated results show that the safety factor of the reinforced slope is 1.425, which can meet the requirements of relevant codes. (4) in order to further analyze the feasibility of the reinforcement scheme, The stability of the reinforced slope is calculated and analyzed by the finite element software Midas. The results show that the safety factor of the reinforced slope is Fs1.425, which can meet the requirements of engineering safety and related codes. The slope reinforcement scheme is feasible. (5) the technical measures and site monitoring scheme of the slope reinforcement scheme are formulated. The results show that the maximum deformation of the slope after reinforcement treatment is within the allowable range of deformation. The slope is in a stable state. It fully shows that the slope reinforcement scheme is effective and can provide technical reference for similar projects.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14

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