Directly searching method for slip plane and its influential factors based on critical state of slope

Abstract

In order to determine the slip plane of slope directly by the calculation results of strength reduction method, and analyze the influential factors of slope stability, a numerical model was established in plane strain mode by FLAC3D for homogeneous soil slope, whose parameters were reduced until the slope reached the critical state. Then FISH program was used to get the location data of slip plane from displacement contour lines. Furthermore, the method to determine multiple slip planes was also proposed by setting different heights of elastic areas. The influential factors for the stability were analyzed, including cohesion, internal friction angle, and tensile strength. The calculation results show that with the increase of cohesion, failure mode of slope changes from shallow slipping to the deep slipping, while inclination of slip plane becomes slower and slipping volume becomes larger; with the increase of friction angle, failure mode of slope changes from deep slipping to shallow slipping, while slip plane becomes steeper and upper border of slip plane comes closer to the vertex of slope; the safety factor increases little and slip plane goes far away from vertex of slope with the increase of tensile strength.

Numerical Simulation for the Effect of Joint Inclination to the Stability of Stratified Rock Slope

“…Firstly, the stability mechanism of slope is analyzed. Secondly, numerical models for the slope are founded by fast lagrangian analysis of continua three dimensions (FLAC3D), the application method of shear strength reduction technique [4,5] in Ubiquitous-Joint model is discussed, and the convergence of numerical computations criterion is chosen as the failure criterion for slope. At last, according to the numerical calculation results, the influential factors to the stability of stratified rock slope are analyzed, to give guidance for the real practice.…”

Finite element model with imposed slip surfaces for earth mass safety evaluation

“…To test the proposed model, namely its capacity to remove interslice assumptions, slip surfaces obtained by LIN et al [3] with a limit analysis were used. The model was built in FLAC 3D for a homogeneous soil slope, with 20 m of slope height, 45º of slope angle, being composed of 816 square elements and 1176 nodes.…”

“…The numerical model was fixed in both horizontal and vertical directions on the bottom boundary, only in the horizontal direction on the left and right boundaries, and was left free on the upper boundary. LIN et al [3] used a multiple a multiple slip surface searching method to find the relationship between the safety factor, the slip surface, and the soil geotechnical parameters effective cohesion and effective friction angle (the soil geotechnical parameters unit weight, elastic modulus, and Poisson ratio were fixed with the values of γ=25 kN/m 3 , E=10 MPa, and v=0.3, respectively). These geometric, geotechnical and simulations results were used to define four distinct "Case studies", described below.…”

“…Regarding the tests with variable effective cohesion, the effective friction angle f′ was fixed at 17º by LIN et al [3]. The effective cohesion c′ ranged from 4.2 kPa to 268.8 kPa, being the slip surfaces defined as those closest to the unitary safety factor given in Fig.…”

Computer modeling for pile-soil response under the horizontal head load

“…To obtain detailed information on the behavior, it is necessary to simulate the 3D geometry and nonlinear behavior of the soil. So in the present paper, the numerical simulation method [13,14] is adopted, the behavior of pile subjected to horizontal pile head load is analyzed by the threedimensional (3D) interaction between the soil and the piles, whose result reveals the mechanism of pile with soil under the load of gravitation and load transferring mode along pile shaft for different horizontal pile head loads.…”