A Simulation Study of the Emergency Double-Row Micropile Reinforcement of the Xituo Landslide. Issue 2 (October 2020)

• Record Type: Journal Article
• Authors: Liu, ZhongShuai; Zou, Wukun; Deng, Sangen; Fu, Yu; Tang, Shengchuan; Gou, Dongyuan; Xu, Feng
• Is Part Of: IOP conference series. Volume 570:Issue 2(2020)
• Publication Date: 2020-10
• Subjects: geology engineering -- simulation -- reinforcing effect -- micropile -- Xituo landslide; Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/570/2/022039
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: This paper studies the suitability of a double-row anti-slide micropile solution for the emergency reinforcement project of the Xituo landslide. The FLAC3D program was used to simulate the stability of the landslide before and after micropile installation. Several key parameters were monitored in the simulation such as the landslide displacement, the shear strain rate at the slip surface, as well as the bending moments and the shear forces exerted on the piles. Both the displacement graph and the shear strain rate cloud map of the landslide before reinforcement indicate that the Xituo landslide is in an unstable state and tends toward accelerated collapse. After the double-row anti-slide micropiles were installed, the displacement of the slope toe gradually stabilized, and the displacement on the river side of the highway was significantly reduced. Moreover, the shear strain rate cloud diagram at the location of the micropiles developed upward, and the shear strain rate was small. These changes indicate that the double-row anti-slide micropiles could effectively restrain further deformation and damage because of the Xituo landslide. Furthermore, the simulated maximum shear forces exerted on the piles, 115.5 and 75.8 kN, are much lower than the maximum micropile design value of 260 kN. The simulated maximum pile body bending moments, 3173.8 and 1170.0 kNm, also fall below the recommended maximum value of 4500 kNm. Therefore, double-row anti-slide micropiles are an effective and practical solution for stabilizing the Xituo landslide.