The vast majority of slopes, both natural and constructed, exhibit a complex geometric configuration and three-di- mensional (3D) state, whereas slopes satisfying the assumption of plane strain (infinite length) are seldom encountered. Ex- isting research mainly emphasizes the 3D dimensions and boundary effect in slope stability analysis; however, the effect of complex geometric ground configuration on 3D slope stability is rarely reported. In this paper, an elastoplastic finite-element method using strength-reduction techniques is used to analyze the stability of special 3D geometric slopes. A typical 3D slope underlain by a weak layer with groundwater is described to validate the numerical modeling, safety factor values, and critical slip surface for the 3D slope. Furthermore, a series of special 3D slopes with various geometric configurations are analyzed numerically, and the effects of turning corners, slope gradient, turning arcs, and convex- and concave-shaped sur- face geometry on the stability and failure characteristics of slopes under various boundary conditions are discussed in detail.

Three-dimensional strength-reduction finite element analysis of slopes: geometric effects

Applying modified discontinuous deformation analysis to assess the dynamic response of sites containing discontinuities

The Huangtupo riverside slope, which extends an area of 1.35 × 106 m2 and has a total volume of 6.934 × 107 m3, is one of the most noted large-scale landslides with great concern about the safety of immigrants in the Three Gorges reservoir area of China. During the normal operation, the reservoir water level fluctuates periodically. Water level fluctuation will soften the strength of the geologic materials on the banks, induce underground water fluctuation, and in turn affect the slope stability. On the basis of the thorough engineering geological survey, the analysis of engineering geological conditions and deformation mechanism is conducted primarily. Then, the Huangtupo landslide is divided into four minor landslides, all of which have typical three-dimensional characteristics. To these landslides, a three-dimensional rigorous limit equilibrium method is proposed, which can accommodate failure surfaces of any shape, and satisfies all the equilibrium conditions. In terms of the strength parameters of geologic materials, the stability evolution of the four minor landslides at the Huangtupo landslide under periodical water level fluctuation is investigated in detail. From the results, the 3D safety factors turned out to be somewhat bigger than the 2D results even though they displayed the same trends. The differences between 2D and 3D results are about 2.92–6.11 %. The maximum reduction in safety factors with the rapid down of water level is 0.11. It is suggested that the safety margin of the two minor landslides near the riverside is insufficient and might become instable under periodical water level fluctuation.

Huangtupo landslide stability under water level fluctuations of the Three Gorges reservoir

Three-dimensional slope stability assessment of two-layered undrained clay

A three-dimensional slope stability analysis method based on finite element method stress analysis

This paper analyzes the effects of complex geometries on three-dimensional (3D) slope stability using an elastoplastic finite difference method (FDM) with a strength reduction technique. A series o...

Effects of geometries on three-dimensional slope stability

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Effects of geometries on three-dimensional slope stability