地下水动态作用下大型碎裂顺层岩质滑坡变形响应规律分析

doi:10.13722/j.cnki.jrme.2022.1257

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Abstract Large-scale cataclastic bedding rock landslides are prevalent in the Three Gorges reservoir area, and they continue to displace and deform, posing a significant threat to residents，the Yangtze River channel, and even the Three Gorges Dam. This paper analyzes the characteristics and inducing mechanism of landslide deformation under the dynamic action of reservoir water，rainfall，and groundwater，using multi-factor comprehensive process analysis and quantitative analysis methods based on GPS monitoring data，survey data，and hydrometeorological data of Tanjiahe landslide. The results indicate that：(1) the decrease of reservoir water level will induce the landslide deformation，on the contrary，while the rise of reservoir water level can inhibit the landslide deformation. During the fluctuation of reservoir water level，continuous heavy rainfall will aggravate the landslide deformation. (2) During the flood season and storage season，rainfall is conducive to raising the groundwater level. The previous monthly rainfall reaches more than 129 mm，the groundwater level of QSK2 has a fluctuation process，during which the hydraulic power leads to significant landslide deformation. (3) The heavy rainfall on the first day did not cause any landslide deformation. However，after two days of continuous rainfall，the groundwater level of QSK2 rose to a critical value of 242.4 m，which led to severe landslide deformation. As the local groundwater level dropped from its peak value of about 245 m to the critical value of 241 m，the landslide deformation trend weakened. (4) During the fluctuation of QSK2 groundwater table，the higher the uplift height of groundwater table (≥2.85 m)，the average groundwater table(≥242.1 m)，the peak value of groundwater table(≥244.0 m)，and other related parameters，the more severe the landslide deformation tends to be. On the contrary，when the groundwater level is lower，the landslide generally tends to be more stable. The research results can be referenced for analyzing the inducing mechanism，monitoring and providing warning，as well as emergency treatment of cataclastic bedding rock landslides.

Key words： slope engineering rainfall reservoir water groundwater deformation characteristics inducing mechanism cataclastic bedding rock landslide

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	WANG Biao1
	2
	YI Qinglin1
	2
	NIU Yan3
	DENG Maolin1
	2
	TONG Quan1
	2
	LIU Kaixin1
	2

Cite this article:

WANG Biao1,2,YI Qinglin1, et al. Analysis of deformation response law of large cataclastic bedding rock landslide under dynamic action of groundwater[J]. , 2023, 42(S2): 4140-4151.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1257 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4140

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