Stability Analysis of Loess Landslides Induced by Irrigation

2014 ◽  
Vol 716-717 ◽  
pp. 395-399 ◽  
Author(s):  
Zhao Duan ◽  
Zi Guang He ◽  
Hong Zhou Lin
Keyword(s):  
Stability Analysis ◽  
Groundwater Level ◽  
Shaanxi Province ◽  
Dynamic Equations ◽  
Safety Factors ◽  
Loess Landslide ◽  
Shearing Strength ◽  
Loess Landslides ◽  
The Stability ◽  
Sliding Force

This passage picks up the case of the loess landslide in Zhangcunwan, Jingyang county, Shaanxi province for the research of the formation mechanism and stability analysis of loess under the condition of irrigation, which raises the dynamic equations of loess landslides induced by irrigation,and applies the equations into the case in the landslide in zhangcunwan. Besides,the passage has given the trajectory equations in the landslide in Zhangcunwan and verifies, as a consequence ,the results can be calculated accurately and it generally tallies with the actual one. The internal soil anti-shearing strength and the safety factors will decrease when the groundwater level rises 1m per case till the stabilizing force decreases by the soil sliding force when the whole slope if in the state of limited equilibrium.As the contents of irrigation rising continuously of the water level, the anti-shearing strength will be outdone by the shearing strength and this shall bring about the loss of the stability of the slope..

scholarly journals Failure Process and Stability Analysis of Rock Blocks in a Large Underground Excavation Based on a Numerical Method

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Shijie Chen ◽  
Ming Xiao ◽  
Juntao Chen
Keyword(s):  
Stability Analysis ◽  
Numerical Analysis ◽  
Numerical Method ◽  
Failure Process ◽  
Surrounding Rock ◽  
Underground Excavation ◽  
Analysis Method ◽  
Safety Factors ◽  
Geological Conditions ◽  
The Stability

A numerical analysis method for block failure is proposed that is based on continuum mechanics. First, a mesh model that includes marked blocks was established based on the grid-based block identification method. Then, expressions of the contact force under various contact states were derived based on the explicit contact force algorithm, and a contact simulation method between blocks and the surrounding rock was proposed. The safety factors of the blocks were calculated based on the strength reduction method. This numerical analysis method can simulate both the continuous deformation of the surrounding rock and the discontinuous failure processes of the blocks. A simple example of a sliding block was used to evaluate the accuracy and rationality of the numerical method. Finally, combined with a deep underground excavation project under complex geological conditions, the stability of the blocks and rock were analyzed. The results indicate that the key blocks are damaged after excavation, the potentially dangerous blocks loosen and undergo large deformations, and the cracks between the blocks and the rock gradually increase as the excavation proceeds. The safety factors of the blocks change during the excavation. The numerical results demonstrate the influence of the surrounding rock on the failure process and on the stability of the blocks, and an effective analysis method is provided for the stability analysis of blocks under complex geological conditions.

Stability Analysis of Mountain Slope Based on Finite Element and Discrete Element

2012 ◽  
Vol 170-173 ◽  
pp. 1087-1090
Author(s):  
Wei Bin Yuan ◽  
Cheng Min Ye ◽  
Ji Yao ◽  
Lie De Wang
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Slope Stability ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Soil Slope ◽  
Safety Factors ◽  
Mountain Slope ◽  
The Stability ◽  
Element Method

In recent year, the foundations of the stability analysis of slope were provided by the development of finite element and discrete element method. Using finite element and discrete element method, the stability analysis of three typical slopes of shiwu thorp of Quzhou was carried out. The safety factors of slope profile were obtained. Based on the judgment criterion of slope stability，the slopes stability of shiwu thorp was judged. The results showed that the way to analyze the stability of soil slope is feasible.

scholarly journals Analysis of loess landslide mechanism and numerical simulation stabilization on the Loess Plateau in Central China

2021 ◽  
Vol 106 (1) ◽  
pp. 805-827
Author(s):  
Wan-li Xie ◽  
Qianyi Guo ◽  
Jason Y. Wu ◽  
Ping Li ◽  
Hui Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Tensile Stress ◽  
Shear Strain ◽  
Shear Crack ◽  
Central China ◽  
Shaanxi Province ◽  
Sliding Surface ◽  
Loess Landslides ◽  
Sliding Force

AbstractLoess landslides have complicated deformation mechanisms. Accurately describing the internal failure deformation of loess landslides and establishing a theoretical method of landslide instability evaluation for the prevention of subsequent landslides have become important topics in western development project construction in China. This paper presents a case study of the Zhonglou Mountain landslide in Shaanxi Province, China. Based on field investigation results, a two-dimensional stability analysis model was constructed using the finite element method. Taking the deformation characteristics of the landslide as the research basis, the distribution laws of the displacement, stress, and shear strain of this landslide were identified with the strength reduction finite element numerical simulation method. Additionally, the safety factor was evaluated under normal and storm conditions. The numerical simulation results show that the horizontal tensile stress of the landslide was mainly distributed in the middle and upper parts of the landslide under normal conditions, while the vertical tensile stress was distributed near the sliding surface. Under heavy rainfall, the sliding force increased, and the anti-sliding force and anti-sliding section decreased; the location of the maximum shear strain shifted down from the middle and upper parts of the landslide body to the area with a shear crack, and the plastic shear strain area expanded along nearly the entire the sliding surface, leading to the occurrence of a landslide. Thus, the use of anti-slide piles to stabilize the landslide was proposed and tested. Monitoring points were arranged along the sliding surface to evaluate the displacement, stress, and strain responses. The on-site observation results agreed with the modeling results. The use of anti-slide piles was demonstrated to be an effective stabilization method for the Zhonglou Mountain landslide.

scholarly journals The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3047
Author(s):  
Zuyong Li ◽  
Gengshe Yang ◽  
Hui Liu
Keyword(s):  
Pore Structure ◽  
Triaxial Compression ◽  
Strength Loss ◽  
Loess Landslide ◽  
Strength Deterioration ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Loess Landslides ◽  
The Stability

The loess landslide in Gaoling District of Xi’an, Shaanxi in China is closely related to the seasonal freeze–thaw cycle, which is manifested by the destruction of pore structure and strength deterioration of the loess body under freeze–thaw conditions. In order to study the relationship between macro-strength damage and pore structure deterioration of saturated loess under freeze–thaw conditions and its influence on the stability of landslides, this paper explores the effect of freeze–thaw cycles on the strength of saturated undisturbed loess through triaxial compression test, and explores the micro-microstructure changes of saturated undisturbed loess through scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR). This is to analyze the evolution of the pore structure and strength loss evolution of saturated loess during the freeze–thaw process, and to describe the freeze–thaw damage of saturated undisturbed loess through the change of porosity and strength deterioration. Then, the internal correlation expression between the porosity change and the strength degradation is established to realize the verification analysis of the test data based on the correlation model. The research results show that: (1) As the number of freeze–thaw cycles increases, the peak strength loss rate gradually increases, and the strength deterioration of saturated loess becomes more and more obvious. (2) The freeze–thaw cycle will lead to the development of pores and cracks in the sample, accompanied by the generation of new cracks, which will cause the deterioration of the pore structure of the sample as a whole. (3) The response of strength damage and porosity deterioration of saturated undisturbed loess is roughly similar under the freeze–thaw cycle. The change in porosity can be measured to better reflect the strength deterioration of saturated loess. Therefore, the change of pore structure of undisturbed loess under freeze–thaw cycle conditions is tested by field sampling and indoor tests to reflect the phenomenon of strength deterioration, thereby analyzing the stability of loess slopes.

Integral Anti-Slide Stability Analysis of RCC Gravity Dam

2013 ◽  
Vol 275-277 ◽  
pp. 1480-1483
Author(s):  
Li Zhang ◽  
Dan Pang ◽  
Jian Liu
Keyword(s):  
Stability Analysis ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Gravity Dam ◽  
Safety Factors ◽  
Standard Requirement ◽  
Load Combination ◽  
Dam Stability ◽  
The Stability

The main purpose of the gravity dam stability analysis is to examine the stability safety in all possible load combination cases. Combined with the engineering example, the method of modeling , loading and analysis for the gravity dam by ansys is introduced in this paper, then the limit equilibrium method and the strength reserve method are adopt to calculate the safety factor under two conditions. The results indicate that the two safety factors which are calculated under two conditions can all satisfy the standard requirement; it is reasonable to analyze the gravity dam stability through two methods.

Analysis of the Stability and Treatment Method of K135+514~+678 Section Landslide of a Highway in Shaanxi Province

2014 ◽  
Vol 926-930 ◽  
pp. 515-519
Author(s):  
Zhi Pei Zhang ◽  
Guo Qing Zhao ◽  
Li Fei ◽  
Fei Long Li
Keyword(s):  
Natural Condition ◽  
Working Condition ◽  
Stable State ◽  
Treatment Method ◽  
Shaanxi Province ◽  
Unstable State ◽  
Loess Landslide ◽  
Control Scheme ◽  
Calculation Results ◽  
The Stability

Based on a typical loess landslide of K135+514 ~ +678 section of a Highway in Shaanxi Province, the formation mechanism and the possible failure mode of the loess landslide are analyzed, and the stability of the loess landslide is evaluated. The calculation results show that the landslide is in a stable ~ basically stable state during natural condition and in unstable state after working condition. According to the basis of those analyses, the treating measures of the landslide are put forward. At last after the schemes’ comparison the "anti-slide pile + unloading + slope drainage+ plant greening" comprehensive control scheme is determined, this has certain reference significance for the similar engineering in the future.

Idealized curved surface for mimicking slope failure: toward the sequential failure

2021 ◽  
Author(s):  
Ko Chi-Jyun ◽  
Wang Chih-Ling ◽  
Wong Hock-Kiet ◽  
Tai Yih-Chin
Keyword(s):  
Stability Analysis ◽  
Groundwater Level ◽  
High Speed ◽  
Large Scale ◽  
Slope Failure ◽  
Satellite Image ◽  
Failure Surface ◽  
Curved Surface ◽  
Landslide Event ◽  
The Stability

<p><span>In Tai et al. (2020), the concept of idealized curved surface (ICS) is proposed to mimic the failure surface, and the application to a large-scale landslide yields good agreement with the satellite image for the post-failure flow paths. The ICS consists of two constant curvatures in the down-slope and cross-slope directions, respectively. Hence, it is convenient to evaluate the stability based on the moment of momentum with respect to the plausible ICS. In this study we are going introduce a new formula for the stability analysis, in which the balance of angular momentum is employed, so that the local failure thickness (above the ICS) and the local ground water level can be taken into account. That is, the depth distribution of the landslide body may also have significant impacts on the slope stability.</span></p><p><span>Motivated by the similarity between landslide and granular avalanches, the periodic sand avalanches on a heap are investigated by means of the snap shots of high-speed camera, where the sand is accumulated up to a specific volume before sliding down. It is found that the first failure takes place near the toe of the avalanching body and the rupture surface develops and moves upwards. The ICS and the associated stability analysis can well explain the initial failure near the toe. This concept can also be applied to the mystery of the Hsiaolin landslide, taking place in southern Taiwan in 2009, where the released volume is up to more than 22 Mm</span><sup><span>3</span></sup><span> but the mean slope is around 21 degrees. In spite of a 2D analysis, it can be found that, with a reasonable groundwater level, the first failure could be suspected to develop around the toe part. Therefore, we speculate that the plausible state of the landslide is the rainfall induced rise of groundwater level, inducing the sequential landslides and resulting the resultant large-scale landslide event.</span></p>

scholarly journals SLOPE STABILITY ANALYSIS USING GIS

2016 ◽  
Vol XLII-2/W1 ◽  
pp. 151-153 ◽  
Author(s):  
Ahmed Bouajaj ◽  
Lahcen Bahi ◽  
Latifa Ouadif ◽  
Mohamed Awa
Keyword(s):  
Information System ◽  
Stability Analysis ◽  
Geographic Information System ◽  
Slope Stability ◽  
Water Table ◽  
Safety Factor ◽  
Safety Factors ◽  
The North ◽  
The Stability ◽  
2D And 3D

An analysis of slope stability using Geographic Information System (GIS) is presented in this paper. The methodology is based on the calculation of the safety factor in 2D and 3D using ArcGis. Hovland's Method in 3D and 2D were used in the stability analysis of the slope located at the 34 kilometer point (K.P.34) on the highway in the North of Morocco connecting Tangier to Ksar Sghir. Results shows that the safety factors obtained in 3D are always higher than those obtained in 2D and the slope becomes unstable when the water table level is less than 1 m.

The Stability Analysis for One Failure Slope

2014 ◽  
Vol 577 ◽  
pp. 1146-1149
Author(s):  
Si Cheng Zhong ◽  
Kun Yong Zhang ◽  
Fang Qing Tang ◽  
Xiong Bing Zhang
Keyword(s):  
Stability Analysis ◽  
Slope Failure ◽  
Comprehensive Evaluation ◽  
Influence Factors ◽  
Field Investigation ◽  
Construction Process ◽  
Safety Factors ◽  
Management Measures ◽  
The Stability

On the basis of field investigation, the stability of the slope was calculated by GEO-SLOPE considering several different influence factors. After comparing these calculated safety factors, the reason for the failure slope was found out. Then, combined with the construction process, a comprehensive evaluation was given to this slope about the reason for slope failure. It was put forward the corresponding management measures according to the main reason.

Application of Limit Equilibrium FEM Method to the Slope

2014 ◽  
Vol 926-930 ◽  
pp. 524-528
Author(s):  
Yan Zhai ◽  
Wei Ya Xu ◽  
Chong Shi ◽  
Sheng Nian Wang ◽  
Hai Long Zhang
Keyword(s):  
Safety Factor ◽  
Limit Equilibrium ◽  
Plastic State ◽  
Sliding Surface ◽  
Safety Factors ◽  
Fem Method ◽  
Stability Of Slope ◽  
The Difference ◽  
The Stability ◽  
Sliding Force

The limit equilibrium FEM method is a common method using the result of stresses fields obtained from numerical calculation to get resistant sliding force and driving sliding force on the dangerous sliding surface to analyze the stability of slope. The safety factor is the ratio of resistant sliding force to driving sliding force on the most dangerous sliding surface.When compares limit equilibrium FEM method with the rigid body limit equilibrium method, its applicability needs to be verified. Taking a project as an example, this work uses the two methods to analyze the stability of the slope. After calculating, two different safety factors on the sliding surface were got, and the reasons inducing the difference of the safety factors were analyzed. The result showed the safety factor calculated from the limit equilibrium FEM method is much closer to the real situation especially when some parts of the soil are in plastic state. It is mainly because the limit equilibrium FEM method takes the coordination of deformation into consideration. Then two conditions: nature and rain are calculated to analyzed the slope stability. It made a judgment of the stability of the slope and gave a beneficial conclusion to the project.

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