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A platform for research: civil engineering, architecture and urbanism
Site response of ancient landslides to initial impoundment of Baihetan Reservoir (China) based on ambient noise investigation
Abstract When large reservoirs are impounded, the reactivation of ancient landslides significantly contributes to erosion. In this study, we investigated the site response of ancient landslides during the initial impoundment of the Baihetan Reservoir. Ambient noise recordings collected at various reservoir water levels were analysed using the microtremor horizontal-to-vertical spectral ratio technique and single-station RayDec method. Our results indicate that, with an increase in the early reservoir water level, the resonance frequencies and spectral ratio amplitude of landslides changed. However, the direction of site resonance did not change. Furthermore, to explain the site response changes, we simulated the pore water pressure and stability of the S2# landslide using Geo-Studio software. We observed that the subsurface shear wave velocity of the slope decreased with an increase in reservoir water. Our study provides a new method for analysing the site response of ancient landslides and a new perspective for studying landslide stability in reservoir areas.
Highlights Site response of ancient landslides with reservoir water level rise were discussed. Subsurface Vs of ancient landslides varies with the rise of reservoir water level. The relationship between site response and slope stability was explained.
Site response of ancient landslides to initial impoundment of Baihetan Reservoir (China) based on ambient noise investigation
Abstract When large reservoirs are impounded, the reactivation of ancient landslides significantly contributes to erosion. In this study, we investigated the site response of ancient landslides during the initial impoundment of the Baihetan Reservoir. Ambient noise recordings collected at various reservoir water levels were analysed using the microtremor horizontal-to-vertical spectral ratio technique and single-station RayDec method. Our results indicate that, with an increase in the early reservoir water level, the resonance frequencies and spectral ratio amplitude of landslides changed. However, the direction of site resonance did not change. Furthermore, to explain the site response changes, we simulated the pore water pressure and stability of the S2# landslide using Geo-Studio software. We observed that the subsurface shear wave velocity of the slope decreased with an increase in reservoir water. Our study provides a new method for analysing the site response of ancient landslides and a new perspective for studying landslide stability in reservoir areas.
Highlights Site response of ancient landslides with reservoir water level rise were discussed. Subsurface Vs of ancient landslides varies with the rise of reservoir water level. The relationship between site response and slope stability was explained.
Site response of ancient landslides to initial impoundment of Baihetan Reservoir (China) based on ambient noise investigation
Liu, Hongfeng (author) / Luo, Yonghong (author) / Feng, Wenkai (author) / Wang, Yunsheng (author) / Ma, Haimiao (author) / Hu, Peng (author)
2022-10-10
Article (Journal)
Electronic Resource
English