反倾层状岩质边坡悬臂梁极限平衡模型研究

发布时间：2018-04-22 16:32

本文选题：反倾层状岩质边坡 + 悬臂梁极限平衡模型　；参考：《岩土力学》2014年S1期

【摘要】：基于悬臂梁理论和运用极限平衡法研究反倾层状岩质边坡变形破坏是一种既注重变形过程又注重力学分析的可行方法。在国内外研究现状基础上,研究悬臂梁极限平衡分析模型。首先通过野外现象的观测,提出能对反倾层状边坡变形几何空间条件进行分区的"基准面"的概念,再利用"基准面"分析岩层分区破坏模式的力学机制,认为破坏面的形成机制是弯曲拉裂和压缩剪切的共同作用结果,对悬臂梁极限平衡分析模型中的各参数确定给出假设或理论分析,建立了计算模型。以重庆市巫溪县中梁水库硝洞槽-郑家大沟库段反倾岸坡为例,在边坡变形破坏模式识别基础上,应用悬臂梁极限平衡模型理论分析实例,验证该模型的合理性,同时也给出反倾层状边坡悬臂梁极限平衡模型计算步骤,用数值模拟方法验证该分析模型的正确性。模型计算结果表明,破坏区大体分为滑移区、倾倒区和倾倒变形影响区,破坏区大小由坡角、岩层倾角、坡高共同决定,当三者关系(见式(13))大于0时,才存在破坏区,才有可能发生变形破坏。研究成果对反倾层状岩质边坡稳定性评价与防治具有理论指导意义和应用价值。
[Abstract]:Based on the cantilever beam theory and the limit equilibrium method, it is a feasible method to study the deformation and failure of anti-dip bedded rock slope both in the process of deformation and in the analysis of mechanics. The limit equilibrium analysis model of cantilever beam is studied on the basis of the research status at home and abroad. Based on the observation of field phenomena, the concept of "datum level", which can be used to partition geometric spatial condition of deformation of reverse inclined layered slope, is put forward, and then the mechanical mechanism of the failure mode of rock stratum is analyzed by using "datum level". It is considered that the forming mechanism of the failure surface is the result of the joint action of bending tension and compression shear. The hypothesis or theoretical analysis of the parameters in the limit equilibrium analysis model of cantilever beam is given and the calculation model is established. Taking the back slope of Zhongliang Reservoir in Zhongliang Reservoir, Wuxi County, Chongqing as an example, based on the recognition of slope deformation and failure mode, the theoretical analysis example of cantilever beam limit equilibrium model is used to verify the rationality of the model. At the same time, the calculation steps of limit equilibrium model of cantilever beam in reverse inclined slope are given, and the correctness of the model is verified by numerical simulation. The results of model calculation show that the failure zone is generally divided into slip zone, toppling zone and toppling deformation affected area, and the size of the failure zone is determined by the slope angle, rock dip angle and slope height. When the relationship between the three factors is greater than 0, the failure zone will only exist. Deformation and destruction are only possible. The research results have theoretical guiding significance and application value for the stability evaluation and prevention of reverse dip stratified rock slope.
【作者单位】：中国地质大学(武汉)工程学院;重庆地质矿产研究院;
【基金】：国家重点基础研究发展计划(973项目)资助(No.2011CB710605) 教育部新世纪“优秀人才支持计划”资助(No.NCET-07-0775)
【分类号】：TU45

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