#Plaxis 2d slope stability tutorial free#

The results show that using the 3D aspect gives more insight into the complicated slope stability problem. The findings of the research were compared to other findings from the literature. AВ parametric studyВ was undertaken to study the effect of pile position, pile inclination, pile length andВ pile diameterВ on theВ factor of safetyВ of the piled-slopes. The 3D model was verified using experimental data from the literature for a stabilized silty sand slope in a large-scale physical model. A 3D finite element model was developed using the finite element program PLAXIS. A 3 dimensional (3D) finite element study is carried out to investigate the effect of different parameters on the stability of slopes stabilized with piles. Stabilized slopes with piles are numerically studied in the current paper. Piles are commonly used to stabilize slopes or to improve slope stability. Slope stability can be achieved using different methods. Comparing the results, the limitation of 2D analysis for piled cohesive-frictional slope is highlighted. In 3D analyses, it is shown that spacing ratio beyond S/DВ =В 4 ( S: pile spacing, D: diameter of the pile), the soil will flow between piles leading to a total vanish of the arching effect when S/D exceeds 12.

#Plaxis 2d slope stability tutorial free#

Piles with free head contribute marginally to the increased factor of safety of cohesive-frictional slope. According to the obtained results, the fixed pile head located at the slope middle better improves the stability and reduces the optimal length of the pile. Next, more rigorous parametric studies taking account of the exact geometry was carried out using 3D analyses. First, 2D parametric studies were performed to identify both the optimal location and length of the pile as well as the effect of pile head conditions. Additionally, it is shown that the initial stress field does not affect the FoS when using a Mohr-Coulomb failure criterion.In this paper, numerical computations using PLAXIS 2D and 3D have been conducted to optimize a row of piles in cohesive-frictional slope stabilization. Further studies highlight the advantages of using an adaptive mesh refinement to determine FoSs. When using the modified approach, both the SRFEA and the FELA provide very similar results. Suggestions to overcome this problem, proposed by Davis (1968), lead to conservative FoSs therefore, an enhanced procedure has been investigated. The FELA on the other hand provides rigorous upper and lower bounds of the factor of safety (FoS) but is restricted to associated flow rules. Displacement-based finite element analyses using a strength reduction technique suffer from numerical instabilities when using non-associated plasticity, especially when dealing with high friction angles but moderate dilatancy angles. The paper compares the performances of strength reduction finite element analysis (SRFEA) with finite element limit analysis (FELA), whereby the focus is related to non-associated plasticity. In comparison to limit equilibrium methods, numerical analyses do not require any definition of the failure mechanism a priori and enable the determination of the safety level more accurately. In recent years, finite element analyses have increasingly been utilized for slope stability problems.