砂泥岩缓倾顺层边坡稳定性分析与支护效果评价

发布时间：2018-03-16 09:05

本文选题：砂泥岩　切入点：缓倾顺层边坡　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着国家西部开发战略的实施,人类的工程活动导致了大规模的山体滑坡,不仅严重危及人民的生命安全,也造成了大量的经济损失。砂泥岩缓倾顺层边坡稳定性与加固支护效果评价问题一直是我国西南山区边坡的重点研究课题,其研究问题涉及铁路、公路、水电、采矿和建筑等工程行业。长期以来,国内外广大学者对边坡病害体稳定性、加固效果分析评价的研究形成了一系列比较成熟的理论和方法,但针对具体工程项目开展砂泥岩缓倾顺层边坡的失稳破坏、加固后可靠程度等相关问题的研究则相对较少,所以有必要对砂泥岩缓倾顺层边坡的失稳破坏机理、稳定性、加固效果分析评价等问题进行深入研究。本文基于中交股份山岭区资源节约型高速公路建设关键技术研究项目,结合麻辣溪砂泥岩缓倾顺层边坡(K27+265右侧边坡)的开挖支护过程,开展砂泥岩缓倾顺层边坡的现场监测、稳定性分析、加固支护效果评价方面的研究。按照查阅资料一现场实地调查一监测数据分析一建立模型一数值分析一支护效果评价的研究思路：首先查阅砂泥岩缓倾顺层边坡的相关文献资料,明确砂泥岩缓倾顺层边坡的研究现状；在已有边坡分析资料的基础上,论述麻辣溪边坡的区域工程地质条件、边坡所处的地理环境、周边发生边坡破坏的变形机制等问题；以现场测试采集的水位、地表位移、土压力、锚索应力、深部岩土体位移等试验数据为依据,分析边坡发展趋势；应用工程地质学、弹塑性力学、岩石力学、数值分析等专业知识综合研究边坡变形,应力发展状况；针对边坡的稳定性利用刚体极限平衡法和PLAXIS数值模拟技术基于摩尔库伦破坏准则全方位认识边坡整体变形发展进程。在有限元计算中,采用12节点单元模型,基于摩尔库伦准则分析天然状态、一次性开挖状态、锚索框架支护状态三种工况,得出边坡土体位移,应力,安全系数的变化规律,参照现场监测数据,分析数值计算结果；最后结合边坡加固措施,对加固支护效果从适宜性、技术状况、整体作用安全状况进行评价预测,分析边坡支护等级和加固状态,并且预测边坡未来的变化趋势。
[Abstract]:With the implementation of the national strategy for the development of the western region, human engineering activities have led to large-scale landslides, which not only seriously endanger the safety of people's lives, The evaluation of slope stability and reinforcement and support effect of sand and mudstone gently inclined bedding slope has always been a key research topic in the southwest mountain slope of China, and the research problems involve railway, highway, hydropower, etc. For a long time, many scholars at home and abroad have developed a series of mature theories and methods for the analysis and evaluation of slope disease body stability and reinforcement effect. However, for the specific project, there are few researches on the instability failure of sand and mudstone gently inclined bedding slope, and the relative problems such as the reliability degree after reinforcement are relatively few, so it is necessary to study the failure mechanism and stability of the sand mudstone gentle dip bedding slope. The analysis and evaluation of reinforcement effect are studied in depth. Based on the key technology research project of resource-conserving expressway construction in Zhongjiaojiaojiaojiaojiaojiaoshanling district, combined with the excavation and support process of the slope of gently inclined bedding slope K27265 in Malaixi sand and mudstone, To carry out on-site monitoring and stability analysis of gently inclined bedding slopes of sand and mudstone, Research on the evaluation of reinforcement and support effect. According to the reference data-site investigation-monitoring data analysis-model-numerical analysis-support effect evaluation thought: first, refer to the slope of sand and mudstone gentle sloping bedding. And related literature, Based on the existing slope analysis data, this paper discusses the regional engineering geological conditions of the slope, the geographical environment of the slope, the deformation mechanism of the surrounding slope, and so on. Based on the field test data of water level, surface displacement, earth pressure, anchor cable stress, displacement of deep rock and soil, the development trend of slope is analyzed, and the engineering geology, elastoplastic mechanics, rock mechanics, etc. Numerical analysis and other professional knowledge to study the slope deformation, stress development; Based on the Moore Coulomb failure criterion and rigid body limit equilibrium method and PLAXIS numerical simulation technique, the overall deformation development process of slope is fully understood. In the finite element method, a 12-node element model is used. Based on the Mohr Coulomb criterion, the natural state, the one-off excavation state and the anchor cable frame support state are analyzed. The variation rules of the displacement, stress and safety factor of the slope soil are obtained, and the numerical calculation results are analyzed with reference to the field monitoring data. Finally, combined with slope reinforcement measures, the effect of reinforcement and support is evaluated and forecasted from suitability, technical condition and overall action safety condition, and the grade and state of slope support are analyzed, and the trend of slope change in the future is predicted.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU45;P642.2

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