水位上升条件下陡坡破坏离心模型试验研究  

Centrifuge modeling of steep slope failure under water-level rising conditions

作　　者：赵杰 马卓娜 黄会宝 张嘎[2] ZHAO Jie;MA Zhuona;HUANG Huibao;ZHANG Ga(China Energy Group Dadu River Hydropower Development Co.,Ltd.,Chengdu 610041,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国能大渡河流域水电开发有限公司,四川成都610041 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水利水电科技进展》2022年第6期86-91,共6页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划(2018YFC1508503)。

摘　　要：基于变形与破坏过程耦合分析的研究思路,针对水位上升条件下黏性土陡坡变形破坏开展了离心模型试验,测定了试验过程中边坡的位移时程及其分布,并进行点对分析确定了边坡破坏过程,揭示了边坡的破坏机理。研究结果表明:水位上升引起的陡坡剪切破坏从坡脚开始,逐渐向上发展与坡顶张拉裂缝共同形成整体滑裂面;水位上升过程导致陡坡产生显著变形并在一定区域内集中,出现了明显的变形局部化,导致该处出现局部破坏,局部破坏逐渐发展并贯通形成滑裂面;滑裂面形成后边坡变形主要出现在滑动体内部,滑动体上不同点的位移特征受到所在位置的影响。A centrifuge model test was conducted on the deformation and failure of a cohesive soil steep slope under the water-level rising conditions.The failure mechanism was analyzed based on integrated analysis scheme of deformation and failure processes using measured displacement of the slope.The test results showed that the water-level rising resulted in a progressive slippage failure of the slope which started at the toe and gradually developed upwards to form an integral slip surface with the tensile cracks on the top.The water-level rising process induced significant deformation and concentrated within a limited zone.The development of deformation localization resulted in the local failure of the slope and the coupling development of both was essential to the full slip surface of the steep slope.Significant deformation occurred after the full slip surface appeared and the deformation characteristics of each point were related to its location.

关 键 词：陡坡 渐进破坏 变形局部化 水位上升 离心模型试验 

分 类 号：TU411.93[建筑科学—岩土工程]