Deformation Characteristics and Revival Mechanism of Yahuokou Multi-stage Landslide in Zhouqu, Gansu Province

doi:10.19657/j.geoscience.1000-8527.2021.157

Abstract

Abstract:

On July 19^th, 2019, a multi-stage landslide (volume: 215.5×10⁴ m³) with a reactivated sliding in the middle groove of the paleo-landslide occurred in Yahuokou (Zhouqu County,Gansu Province). The landslide started from the cliff mouth at the top of the slope body, and slowly slid down to the Minjiang River with flow shape. This blocked the Minjiang River channel and raised the water level, seriously threatening the safety of nearby residents and downstream towns. To study the deformation characteristics and revival mechanism of the landslide, the landslide geo-environmental background and deformation history were first investigated through field survey and historical data analysis. With data interpretation on remote sensing, landslide monitoring and rainfall, the landslide initiation and evolution processes were elucidated, and the landslide revival mechanism revealed. The multistage landslide resurrection is characterized by stepwise loading, stress transfer, and initiation. The landslide revival comprises three stages: (1) the upper slide began to flow slowly in a plastic form; (2) the middle platform of the gentle slope was prepressed by the upper sliding body, forming the “cut-fill” effect. Its failure mode is creep slip-tensile crack-sliding; (3) the lower block slid.

Key words: Yahuokou landslide, plastic flow, deformation characteristic, revival mechanism, multi-stage landslide

CLC Number:

P642.22

YANG Xiaohui, ZHU Peng, YUAN Zhongxia, ZHANG Weixiong, DING Baoyan. Deformation Characteristics and Revival Mechanism of Yahuokou Multi-stage Landslide in Zhouqu, Gansu Province[J]. Geoscience, 2023, 37(04): 1004-1012.

Figures/Tables 14

Fig.1 Location of the Yahuokou landslide in Zhouqu, Gansu Province [19]

Fig.2 Monthly rainfall histogram of Zhouqu County in 2019

Fig.3 Remote sensing image and profile of the Yahuokou landslide [19]

Fig.4 Development and distribution of the Yahuokou landslide and its surrounding large-scale landslides [8]

Fig.5 Remote sensing image of the Yahuokou landslide sliding process[19]

Fig.6 Field photo showing the landslide slides up to the top of the broad, gentle platform

Fig.7 Field photo showing the sliding body slides down the steep slope in the form of rock flow

Fig.8 Field photo showing large V-shaped groove formed by stretching after landslide

Fig.9 Field photo showing features of landslide deformation

Fig.10 Remote sensing diagram of each part of the sliding body after July 19th, 2019[19]

Fig.11 Field photo showing core sampling

Table 1 Physico-mechanical parameters of rock and soil mass

滑体部位	含水率 (%)	天然重度 (kN/m³)	黏聚力 (kPa)	内摩擦角 (°)	塑性指数 (%)
上层	8.2	19.7	14.19	17.10	10.73
下层	7.2	19.4	5.08	14.38	11.90

Fig.12 Data plot of landslide velocity monitoring and regional rainfall [19]

Fig.13 Profile for each stage of the landslide revival

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