不等厚反倾层状边坡次生倾倒破坏分析  

Analysis of Secondary Toppling Failure for Anti Inclined Slope Composed of Rock Layers with Unequal Thickness

作　　者：郭志玉 张荣 南凯 郑博文 郭建军 Guo Zhiyu;Zhang Rong;Nan Kai;Zheng Bowen;Guo Jianjun(The Fourth Company,China Railway 12th Bureau Group Company,Xi’an 710000,China;Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中铁十二局集团第四工程有限公司,西安710000 [2]重庆交通大学,重庆400074

出　　处：《科技通报》2022年第2期73-78,共6页Bulletin of Science and Technology

基　　金：国家自然科学基金(U1865103);重庆市技术创新与应用发展专项重点项目(cstc2019jscx-gksbX0072)。

摘　　要：根据极限平衡理论,结合悬臂梁模型,建立不等厚反倾层状边坡次生倾倒地质力学模型,提出不等厚反倾边坡稳定性分析的理论方法,分析了反倾岩层的不等厚特性。揭示了厚、薄岩层交互的反倾边坡中,薄岩层的厚度对坡体稳定性影响规律。薄岩层厚度与厚岩层厚度的比值在0.85~1.0之间时,按照等厚岩层计算坡体稳定性的定性结论是一致的,其他情况下,需考虑薄岩层厚度对坡体稳定性的影响。岩层倾角不是厚、薄岩层交互反倾边坡稳定性的敏感因素。本文所给出的理论分析方法和结论有益于快速判断此类边坡的稳定性。Based on the limit equilibrium theory and the cantilever beam model, the geomechanical model of secondary toppling for anti inclined slope composed of rock layers with unequal thickness is established. The theoretical method for stability analysis of this unequal thickness anti inclined slope is proposed. The characteristics of unequal thickness for anti inclined slope are analyzed. In the reverse dip slope with thick and thin rock layers, the influence of thickness of thin rock layer on the slope stability is revealed. When the ratio of the thickness for thin rock layer to the thickness for thick rock layer is between 0.85~1.0, the qualitative conclusion of slope stability calculated by equal thickness rock layer is consistent. In other cases, the influence of thickness for thin rock layer on the slope stability should be considered. The dip angle of rock stratum is not a sensitive factor for the stability of the interaction of thick and thin rock layers. The presented theoretical analysis method and conclusion in this paper can be used to judge the stability of this kind of slope quickly.

关 键 词：不等厚岩层 反倾边坡 次生倾倒 理论分析 

分 类 号：TU413.62[建筑科学—岩土工程]