Development Characteristics and Deformation Monitoring Analysis of the Zhouchangping Landslide in Maoxian County, Sichuan Province

doi:10.19657/j.geoscience.1000-8527.2020.102

Abstract

Abstract:

The Zhouchangping landslide in Nanxin Town (Mao County, Sichuan Province) is a large-scale ancient landslide, which had an extensive and rapid reactivation in 1982. At present, the sliding body appears as irregular tongue-shaped on the surface, with a length of about 850 m and height difference of about 350 m between its frontal and rear edge. Three levels of sliding were developed on the profile. Drilling revealed that the burial depth of slip zone is mainly 50-70 m, and the volume of potential unstable landslide is estimated to be about 1,500×10 ⁴-2,000×10 ⁴ m ³. The Zhouchangping landslide is divided into four deformation zones. A large number of tensile cracks and downward dislocation scarps are developed at the toe of the middle-rear part and front-edge of the sliding body. The tensile cracks are mainly 0.2-3.0 m wide, and the downward dislocation of the scarps is 2-10 m. Based on field investigation and drilling, we monitored the surface displacement (GNSS), deep-creep deformation (borehole inclinometer) and rainfall on the landslide. Our data (collected across one year) demonstrate that the current deformation rate of the rear edge of the landslide is 0.80 m/a, and those of the middle and frontal edges are 0.69 m/a and 0.51 m/a, respectively, showing a push-type sliding deformation toward 310°. The surface displacement rate fluctuates from 1 to 3 mm/d during the monitoring period, and the fluctuation was mainly influenced/delayed by rainfall. The slip acceleration fluctuates from 0 to 6 mm/d ². Data from ZK2 borehole inclinometer shows that the landslide mainly crept along two layers of slip zones in the 80 m depth, of which the burial depth of shallow and deep slip zone is about 22 m and about 46 m, respectively, with the slip rate fluctuating between 0 and 5 mm/d. Comprehensive study shows that Zhouchangping landslide is currently in the deep-creep stage with slowing deformation. Its deformation rate is affected by factors such as rainfall and river erosion. Under extreme internal and external dynamic conditions, the slope sliding may accelerate and reactivate again, causing incidents such as blocking of the Minjiang River.

Key words: Minjiang River (upper reach), Zhouchangping landslide, ancient landslide reactivation, deep-seated creeping, deformation monitoring

CLC Number:

P642

JIN Jijun, GUO Changbao, SHEN Yaqi, YANG Zhihua, REN Sanshao, LI Xue. Development Characteristics and Deformation Monitoring Analysis of the Zhouchangping Landslide in Maoxian County, Sichuan Province[J]. Geoscience, 2021, 35(01): 103-113.

Figures/Tables 9

Fig.1 Tectonic map of the Zhouchangping landslide and its adjacent area in Maoxian County, Sichuan Province (modified after ref.[19])

Fig.2 Satellite image (showing different zones) and geomorphologic outcrop photos of the Zhouchangping landslide

Fig.3 Engineering geological profile(II') for the Zhouchangping landslide(profile location seeing in Fig.2(a))

Fig.4 Maps showing the deformation monitoring instrument location for the Zhouchangping landslide

Fig.5 Satellite image showing the deformation trend of the Zhouchangping landslide

Fig.6 Cumulative displacement of the Zhouchangping landslide with time at monitor GNSS02

Fig.7 Curves of velocity and acceleration of the Zhouchangping landslide and rainfall changing with time at monitor GNSS02

Fig.8 Variation of accumulated displacement with time at different depths in borehole ZK2

Fig.9 Variation trend of slip rate with time at depth of 22 m and 46 m in borehole ZK2

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