Finite Element Analysis of Failure Characteristics of Structural Soil Slope under Different Rainfall Patterns
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Abstract:
The slope model is established by Geo-Studio, and the deformation characteristics and stability of structural-soil slope in Zhanjiang area under different rainfall patterns are analyzed. The MK model was used basing on Morgenstern-price method. By setting monitoring points at the top, toe and slope surface of the slope, the variation rule of pore water pressure and displacement at the monitoring points under the four types of rainfall are gotten, and the shapes of different types of sliding surfaces are obtained. By the analysis of the most dangerous sliding surfaces, some suggestions are put forward. Those have important reference value for prevention or controlling the geological disasters such as landslides in Zhanjiang area.Keywords:
Slope failure
The occurrence of slope failure is always hard to be predicted. Hence, slope stability analysis must be often carried out in order to ensure the slope is safe and also minimise the probability of slope failure. The slope stability analysis is a prediction on what conditions that can make the slope fail. In this study, the Limit Equilibrium approach is used to determine the degree of stability in terms of Factor of Safety (FOS). Malaysia climatic condition that governed by wet and dry periods will give an effect to the FOS of the slope in terms of shrinkage and creep that accelerate the development of tension cracks on the slope surface. The Proposed Slope Stabilization Works at KM 16.10 (Northbound) Machap - Skudai Expressway has been chosen as a case study. This slope is considered as critical slope because it has been experience a failure in 2004. Tension cracks and high intensity rainfall has been specified as a factor that accelerate the probability of slope failure. The results obtained using SLOPE/W shown that, the slope analyzed is still intact with the minimum FOS is 1.258 even though with the presence of the two factors. Based on that the slope analyzed is confirmed to be safe and the slope has been constructed based on an adequate design.
Slope failure
Safety factor
Factor of safety
Steep slope
Tension (geology)
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Abstract Because the slope-top loading and heavy rainfall are both important factors inducing slope landslides and another geologic hazard. it is necessary to analyze factorial experiment of the slope stability under the slope-top loading and heavy rainfall. Taking a lope engineering of a municipal roads as an example, the stability of the slope was calculated based on the strength reduction method with FEM and Midas-GTS (SRM), and then the double-factor factorial experiment with repeated tests was used to analyze the stability of the slope. The stability results show that, when rainfall conditions remain unchanged, the slope-top loading is applied, and the safety coefficient is reduced by 16%∼21%. When the slope-top loading remains unchanged and the rainfall is strengthened, the security coefficient decreases by 10%∼19%.The analysis shows that the maximum shear strain of the slope is significantly affected by the slope- top loading and rainfall on the top of the slope. The effect of the slope-top loading on the maximum horizontal displacement of the slope is not significant. The effect of heavy rainfall on the maximum displacement of slope is very significant. The combined effect of slope-top loading and heavy rainfall on the maximum horizontal displacement of the slope is significant. Generally speaking, heavy rainfall is the main factor affecting the slope safety. Under the interaction of two factors, the slope stability is poor. In the future, attention should be paid to some local projects such as slope drainage in landslide control and prevention.
Strength reduction
Slope failure
Shear Strength
Safety factor
Factor of safety
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A fill slope with two different angles and fill slope by extend the toe of the fill slope were proposed to stabilize the permanent fill slope at KM 47.9 of Tamparuli -Ranau
Highway, Sabah. In this study, software Oasys Slope version 18.1 was used to analysis the possibility failure of the existing fill slope. Bishop Method with Variably
Indined Interslice Forces was used for the analysis. Two method of proposed fill slope were analyzed. The result showed that the factor of safety fur the existing
slopes close to factor of safety 1. The existing slopes tend to fail. For the proposed slope, the factor of safety increased after application of the proposed fill slope.
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Factor of safety
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산지가 많이 분포하는 우리나라는 지형 특성상 도로, 철도, 건축물 등을 건설하는 과정에서 깎기비탈면이 발생하는 경우가 많다. 건설 과정에서 생성된 깎기비탈면의 상단부에는 기존 산지의 한 부분인 상부 자연사면이 위치하게 된다. 깎기비탈면의 안정성을 평가할 때, 상부 자연사면의 경사가 비탈면 안정성에 미치는 영향에 대해서는 많은 연구가 이루어지지 않았다. 본 연구에서는 깎기비탈면 상단부에 위치한 상부 자연사면이 경사 및 해석 범위에 따라 달라지는 안전율의 변화를 검토해보고 안정해석에 반영하기 위한 방안을 논의해보고자 한다. 상부 자연사면의 형상이 비탈면의 안정성에 미치는 영향을 검토하기 위하여 간단한 비탈면 모형을 가정하고 상부 자연사면의 경사 및 해석 범위를 조정하여 안정해석을 수행하였다. 해석 결과, 깎기비탈면의 안전율을 적합하게 도출하기 위해서는 상부 자연사면의 경사를 일정 부분 포함해야 하는 것으로 나타났다. 본 연구에서는 사질토 특성의 비탈면의 경우, 최소 12m 이상, 점성토 특성의 비탈면의 경우 18m 이상을 안정해석 범위에 포함하여 야 한다.Because of very mountainous topography features in Korea, cutting slope tends to be generated during the construction of road, railroad and the building structure. A natural slope is usually on the top of cutting slope created during construction. As for evaluating the stability of cutting slope, the effect of a natural slope on slope stability has not yet much been studied. This study thus is intended to review the safety of natural slope on cutting slope that may vary depending on slope and analysis scope and then seeks the way of incorporating it into stability analysis. A stability analysis was conducted on a simple model assumption while adjusting the slope and analysis scope in a bid to evaluate the effect of natural slope pattern on slope stability. Consequently, a certain part of natural slope should be included to adequately estimate the safety level of cutting slope. This study suggests that at least 12m should be included for sandy soil slope in the scope of stability analysis, while 18m for cohesive soil slope.
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Abstract Mining activities that involve constructing slopes will increase the potential for slope problems, especially those related to the increased potential for rock slope failure. Therefore, an in-depth study of the stability of the slope is required to determine the ability of the slope to stay stable without reinforcement or to choose the type of reinforcement that best fit a slope if it has a significant potential for landslides. This research aims to obtain the safety factor value of the sandstone mine slopes in Sedau Village, whether or not they comply with the safety requirements. Bishop’s method is employed to analyze the slip surface. Data processing is one of the requirements in Slide 2D Software to analyze slope stability based on material strength. The results of the safety factor obtained based on the analysis using the Bishop Method and 2D Slides are 1.671.
Safety factor
Factor of safety
Slope failure
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Slope failure
Strength reduction
Safety factor
Factor of safety
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Cohesion (chemistry)
Slope failure
Friction angle
Factor of safety
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Abstract. In this study, we performed a model slope experiment with rainfall seepage, and the results were compared and verified with the unsaturated slope stability analysis method. In the model slope experiment, we measured the changes in water content and matric suction due to rainfall seepage, and determined the time at which the slope failure occurred and the shape of the failure. In addition, we compared and verified the changes in the factor of safety and the shape of the failure surface, which was calculated from the unsaturated slope stability analysis with the model experiment. From the results of experiment and analysis, it is concluded that the unsaturated slope stability analysis can be used to accurately analyze and predict rainfall-induced slope failure. It is also concluded that in seepage analysis, setting the initial conditions and boundary conditions is very important. If engineers will use the measured porewater pressure or matric suction, the accuracy of analysis can be enhanced. The real-time monitoring system of porewater pressure or matric suction can be used as a warning of rainfall-induced slope failure.
Slope failure
Safety factor
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