This paper proposes a simple, practical method of three‐dimensional stability analysis for concave slopes in plan view using the equilibrium concept. The force equilibrium and the moment equilibrium conditions over failure mass are satisfied in the analysis. The results obtained using this three‐dimensional method show that the stability of concave slopes in plan view increases as the relative curvature radii R0/H0 decrease, and the influence of plan curvature on the stability of concave slopes in plan view changes when the lateral pressure coefficient of soil Ka is different. When the ratio R0/H0 is relatively small, the slip surface passes not through the toes of concave slopes in plan view, but above them. Finally the results obtained through this three‐dimensional method for a straight slope under six different conditions are compared with the results calculated through six two‐dimensional methods.

Closure of "Three-Dimensional Stability Analysis of Concave Slopes in Plan View"

Three dimensional face stability of a tunnel in weak rock masses subjected to seepage forces

Slopes are more vulnerable to instability when subjected to earthquake ground shaking. In order to account for the dynamic forces induced by ground shaking, a novel procedure is introduced in this paper to estimate slope stability under the ultimate limit state with a combination of pseudo-dynamic approach and discretisation technique. A pseudo-dynamic approach is adopted which allows the introduction of an arbitrary time history of seismic accelerations. In order to consider non-uniformity of soil properties of the slope, the discretisation technique is proposed with the aim of generating a potential failure mechanism with discretised points by forward difference ‘point-to-point’ method. Infinitesimal trapezoidal elements composed of successive discretised points and sloping surface are selected for kinematic analysis. In this way, the problem is decomposed into separate components, which aids computational effort. The upper-bound solutions of limiting surcharge loading and yield seismic acceleration are...

https://www.icevirtuallibrary.com/doi/pdf/10.1680/jgeot.18.D.011

Kinematic analysis of seismic slope stability with a discretisation technique and pseudo-dynamic approach: a new perspective

The fault fracture zone is vital to the stability of the surrounding rock of tunnels in geological engineering. In this study, a three-dimensional numerical model was established for Wuzhuling Tunnel of Zhuji-Yongjia Highway in Zhejiang Province, China. The dynamic processes of tunnel excavation were simulated through the fault fracture zone. The deforming performance and stress distribution of surrounding rock were investigated. Moreover, the stability of surrounding rock in tunnels was analyzed with consideration of the slope angle and the width of the fault. The simulation results indicate that the fault fracture zone in the tunnel can reduce the stability of surrounding rock. The slope angle and the width of the fault all have obvious influences on the stability of surrounding rock in tunnels. Furthermore, the collapse processes of a tunnel in the construction steps were investigated in a laboratory model. Reasonable agreements can be obtained to validate the model presented here and the simul...

Effect of a Fault Fracture Zone on the Stability of Tunnel-Surrounding Rock

A homogenization equation for the small strain stiffness of gap-graded granular materials

Bearing capacity analysis of a saturated non-uniform soil slope with discretization-based kinematic analysis

Pseudo-dynamic lateral earth pressures on rigid walls with varying cohesive-frictional backfill

2D and 3D limit analysis of progressive collapse mechanism for deep-buried tunnels under the condition of varying water table

This technical note presents a novel procedure, discretisation-based kinematic analysis, to investigate the seismic slope stability at limit state. Such a procedure combines the merits of highly ef...

Changbing Qin

Papers

Kinematic analysis of seismic slope stability with a discretisation technique and pseudo-dynamic approach: a new perspective

Bearing capacity analysis of a saturated non-uniform soil slope with discretization-based kinematic analysis

Pseudo-dynamic lateral earth pressures on rigid walls with varying cohesive-frictional backfill

2D and 3D limit analysis of progressive collapse mechanism for deep-buried tunnels under the condition of varying water table

Revisiting seismic slope stability: intermediate or below-the-toe failure?