邢汾高速高边坡优化设计研究

发布时间：2018-03-28 12:54

本文选题：类土质路堑高边坡　切入点：安全系数　出处：《河北工业大学》2014年硕士论文

【摘要】：在中国河北省境内的某高速公路全线80%的线路为类土质质路堑高边坡，属剥蚀构造丘陵地貌，，自然边坡坡角约25-35°。边坡岩石分为中风化、强风化片麻岩。在强风化层中，岩体破碎，节理裂隙发育，影响边坡稳定的节理倾角较大，根据现场勘察资料提供的（岩体的完整性系数、节理产状及密度）参数，按照现行规范行的边坡设计，边坡坡角约55-75°。按此方案进行施工后，约35%的高边坡发生了滑塌，造成不同程度的工程危害及人员伤亡。经本文数值模拟研究后发现，影响边坡稳定的主要因素是其中一组同坡向倾角较大的节理，当坡角为65-75°的开挖边坡极易发生滑塌，为此提出了优化设计方案，进行了二次削坡。众所周知，对类土质质高边坡稳定性的分析，其核心问题是对多组节理的模拟分析，合理的进行路堑高边坡坡型坡率设计、防护加固工程对策选取以及设计优化。本文在国内首次使用有限元软件Z_soil.pc v2012，采用M-C强度屈服准则，有限元强度折减法，进行Multi-Laminate本构模型数值模拟，通过前后两次削坡对比，对影响类土质质高边坡稳定性的因素进行分析，从而明确了工程发生滑塌的具体原因，进而得出结论：类土质质高边坡存在的不同岩层对边坡的稳定性具有较大影响，并且边坡开挖过程对同一层岩体剪应力的影响范围为0～12米；节理和降雨在边坡稳定性分析中占有举足轻重的地位，对这两个因素的分析直接影响到工程质量。
[Abstract]:80% of the lines of a highway in Hebei Province, China, are soil-like cutting high slopes, which belong to eroded structural hills and landforms. The natural slope angles are about 25-35 掳. The slope rocks are divided into moderately weathered and strongly weathered gneiss. Rock mass is broken, joints and fissures are developed, and the inclination of joints affecting the stability of slope is great. According to the parameters (integrity coefficient of rock mass, occurrence of joints and density) provided by field survey data, the slope design is carried out according to the current specifications. The slope angle is about 55-75 掳. After the construction according to this scheme, about 35% of the high slope collapses, resulting in different degrees of engineering hazards and casualties. The main factor affecting the slope stability is a group of joints with the same slope inclination angle. When the slope angle is 65-75 掳, the slope is easy to collapse. Therefore, the optimum design scheme is put forward and the second slope cutting is carried out. As we all know, the core problem of the stability analysis of soil-like high slope is the simulation analysis of multi-group joints, and the reasonable design of slope type slope ratio at high edge of cutting. In this paper, for the first time in China, the finite element software Z_soil.pc v2012 is used to simulate the Multi-Laminate constitutive model by using M-C strength yield criterion and finite element strength reduction method. The factors influencing the stability of the soil-like high slope are analyzed, and the concrete causes of the collapse of the engineering are determined. The conclusion is that the different rock layers of the high slope of the similar soil have great influence on the stability of the slope. And the influence range of slope excavation on the shear stress of the same rock mass is 0 ~ 12 meters, and the joint and rainfall play an important role in the slope stability analysis, and the analysis of these two factors directly affects the engineering quality.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14

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