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Seismic stability of 3D piled unsaturated earth slopes using kinematic limit analysis
Abstract An approach for evaluating the seismic stability of 3D unsaturated earth slopes reinforced with a row of anti-slide piles is presented in this paper within the framework of kinematic limit analysis. The plasticity theory for estimating the lateral force acting on piles is readily extended to unsaturated conditions to account for the variation of moisture content (i.e., matric suction) on the stabilizing effect of piles. A local layer-wise summation method (LSM) was proposed to calculate the energy dissipation rate due to the resistance of piles. The yield acceleration coefficients of specific piled slopes are derived within the context of pseudo-static analysis and are compared with other analytical solutions, demonstrating the feasibility of the semi-analytical method.
Highlights A novel semi-analytical method was developed for the seismic stability estimation of 3D unsaturated earth slopes reinforced with a row of piles. Feasibility of the semi-analytical method is demonstrated by comparing with other analytical solutions. The optimal location of piles lies in the upper-middle part of the slope surface (i.e., x p/l x = 0.7–0.8). The effect of stabilizing piles is more evident when the pile spacing D 1/d p ≤ 3 and is less obvious when D 1/d p > 5.
Seismic stability of 3D piled unsaturated earth slopes using kinematic limit analysis
Abstract An approach for evaluating the seismic stability of 3D unsaturated earth slopes reinforced with a row of anti-slide piles is presented in this paper within the framework of kinematic limit analysis. The plasticity theory for estimating the lateral force acting on piles is readily extended to unsaturated conditions to account for the variation of moisture content (i.e., matric suction) on the stabilizing effect of piles. A local layer-wise summation method (LSM) was proposed to calculate the energy dissipation rate due to the resistance of piles. The yield acceleration coefficients of specific piled slopes are derived within the context of pseudo-static analysis and are compared with other analytical solutions, demonstrating the feasibility of the semi-analytical method.
Highlights A novel semi-analytical method was developed for the seismic stability estimation of 3D unsaturated earth slopes reinforced with a row of piles. Feasibility of the semi-analytical method is demonstrated by comparing with other analytical solutions. The optimal location of piles lies in the upper-middle part of the slope surface (i.e., x p/l x = 0.7–0.8). The effect of stabilizing piles is more evident when the pile spacing D 1/d p ≤ 3 and is less obvious when D 1/d p > 5.
Seismic stability of 3D piled unsaturated earth slopes using kinematic limit analysis
Wang, Long (author) / Sun, De'an (author) / Yao, Yangping (author) / Tan, Yunzhi (author)
2019-08-15
Article (Journal)
Electronic Resource
English
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