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地质力学学报:2021,27(1):73-82
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硬土软岩滑坡近水平滑移的离心机模型试验研究
(1.中国地质科学院地质力学研究所, 北京 100081;2.中国地质大学 (北京), 北京 100083;3.新构造运动与地质灾害重点实验室, 北京 100081;4.长江科学院水利部岩土力学与工程重点实验室, 湖北 武汉 430010)
Centrifuge model tests on the near-horizontal slide of hard soil-soft rock landslides
(1.Chinese Academy of Geological Sciences, Beijing 100081, China;2.School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3.Key Laboratory Neotectonic movement and Geohazard, Institute of Geomechanics, Beijing 100081, China;4.Key Laboratory of Geotechnical Mechanics and Engineering of Water Resources Ministry, Yangtze River Scientific Research Institute, Wuhan 430010, Hubei, China)
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投稿时间:2020-09-27    修订日期:2020-12-30
中文摘要: 中国西北地区存在大量的新近纪硬土软岩滑坡灾害,为研究该类滑坡的变形特征,开展两组离心机模型试验模拟滑带劣化引起滑坡变形破坏的全过程,获取模型坡体土压及位移的实时变化曲线。研究表明,当软弱带强度降低时,硬土软岩滑坡的上部滑体呈块体状滑动,在快速运动滑动过程中,滑体呈现块状平移,不会彻底解体、液化;硬土软岩滑坡中前部出现水平应力集中,导致下伏滑带塑性流动变形,诱发其中前部上覆滑体的水平运动,并向滑坡后缘扩展,最终形成多级水平滑动。
中文关键词: 硬土软岩  滑坡  滑移  离心机  模型试验
Abstract:In order to study the deformation characteristics of the Neogene hard soil-soft rock landslides in northwest China, two sets of centrifuge model tests were conducted to simulate the deformation process under the degraded state of shear zones, and the soil pressure and displacement-time curve during the deformation process of the landslides were obtained. The test results reveal that when the strength of the soft zone decreases, the main body of the hard soil-soft rock landslide is block-like. In the process of fast slide, the slip mass presents an overall translational slide, without complete liquefaction and disintegration. The attenuation of the dynamic friction strength of the slide zone is the main controlling factor in the distance and time of the movement. Moreover, the slide zones of hard soil-soft rock landslides with high stress underwent plastic flow deformations, which caused the horizontal stress concentration in the front part of the landslide, resulting in the horizontal movement of the overlying slip mass in the front part of the landslide and the extension to the back edge of the landslide, and multi-level horizontal slides occurred at the end.
文章编号:     中图分类号:P642    文献标志码:
基金项目:国家自然科学基金项目(42077276,41402281);中国地质调查局地质调查项目(DD20190717)
引用文本:
胡乐,辛鹏,王涛,等,2021.硬土软岩滑坡近水平滑移的离心机模型试验研究[J].地质力学学报,27(1):73-82.DOI:10.12090/j.issn.1006-6616.2021.27.01.008
HU Le,XIN Peng,WANG Tao,et al,2021.Centrifuge model tests on the near-horizontal slide of hard soil-soft rock landslides[J].Journal of Geomechanics,27(1):73-82.DOI:10.12090/j.issn.1006-6616.2021.27.01.008

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