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Model Test Study on Response of Weathered Rock Slope to Rainfall Infiltration under Different Conditions

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Weathered rock(especially granite)slopes are prone to failure under the action of rain-fall,making it necessary to study the response of weathered rock slope to rainfall infiltration for land-slide prevention.In this study,a series of model tests of weathered rock slope under different condi-tions were conducted.The matric suction,volumetric water content,earth pressure and deformation of slope were monitored in real time during rainfall.The response of the slope to rainfall infiltration,fail-ure process and failure mode of slope under different conditions were analyzed,and the early warning criterion for the failure of weathered rock slope caused by rainfall was studied.The results show that the slope deformation evolution process under rainfall condition was closely related to the dissipation of matric suction.When the distribution of the matrix suction(or water content)of slope met the condi-tion that the resistance to sliding of the slip-mass was overcome,the displacement increased sharply and landslide occurred.Three factors including rainfall process,lithologic condition and excavation condition significantly affect the response of weathered rock slope to rainfall.It can be found from the test results under different conditions that compared with intermittent rainfall condition,the rainfall intensity and infiltration depth were smaller when the slope entering accelerated deformation stage un-der the condition of incremental rainfall.The accumulated rainfall when weathered clastic landslide oc-curring was greater than that of weathered granite,which results in greater disaster risk.The excava-tion angle and moisture distribution of a slope were the main factors affecting the stability of a slope.In addition,the evolution processes and critical displacement velocities of slopes were studied by com-bining the deformation curves and matrix suction curves,which can be used as reference for early warning of rainfall-induced weathered rock landslide.

weathered rock slopemodel testrainfallearly warningunsaturated soil

Cong Li、Rongtang Zhang、Jiebing Zhu、Bo Lu、Xiaowei Wang、Fangling Xu、Xiaoke Shen、Jiesheng Liu、Weizhen Cai

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School of Civil Engineering and Architecture,Wuhan Polytechnic University,Wuhan 430023,China

Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGeological Survey project of China Geological SurveyGeological Survey project of China Geological SurveyGeological Survey project of China Geological SurveyGeological Survey project of China Geological Survey

52179110513090254187728041672320DD20160257DD20190263121201009000150023202007000000180506

2024

10.1007/s12583-022-1704-3

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(4)
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