scholarly journals Improved Slice Method for Slope Stability Analysis under Load

2021 ◽  
Author(s):  
Yanjie Sun
Keyword(s):  
Slope Stability ◽  
Slope Failure ◽  
Engineering Practice ◽  
Model Structure ◽  
Stability Coefficient ◽  
Sliding Surfaces ◽  
Check Calculation ◽  
The Stability ◽  
Slice Method ◽  
The Relationship

The load on the top of a slope is an important cause of slope failure, and it is of great significance to study the relationship between the load and the stability of the slope. This paper uses elastic theory and Moore Coulomb's theory as transformation conditions to obtain the slope stability coefficient expression under slope top load based on the Swedish slice method. In view of the actual engineering, the corresponding slope model structure was established, and 5 sliding surfaces were set with the crack on the top of the slope as the shear outlet. According to the slope stability coefficient expression, the stability coefficient of the set sliding surface is solved. The result shows that the slope is unstable under the load. The judgment result is consistent with the GEO-STUDIO check calculation result. This method can provide reference for theory and engineering practice.

Study on Evaluation of High Slope Stability and Countermeasures Based on GEO-SLOPE

2014 ◽  
Vol 988 ◽  
pp. 371-376
Author(s):  
Nian Qin Wang ◽  
Qing Tao Wang ◽  
Qi Pang ◽  
Qian Xue
Keyword(s):  
Slope Stability ◽  
Limit Equilibrium ◽  
Optimization Analysis ◽  
High Slope ◽  
Stability Coefficient ◽  
Anchor Cable ◽  
Before And After ◽  
The Stability ◽  
Reinforcement Measures

Based on the theory of limit equilibrium, by the GEO-SLOPE software,analyzed the stability before and after reinforcement of a high Loess-bedrock slope. The results and conclusions show: (1)Analyzed and Optimized the high Loess-bedrock slope through SLOPE/W module, optimizing the engineering quantity of the anchor cable frame in the local and saving the investment; (2)When taken reinforcement measures, conducted the SLOPE/W model again, the stability coefficient is 1.459, the effect testified by projects is obvious; (3)Aiming at the optimization analysis, proposed countermeasures system, with reference for reinforcement of a high Loess-bedrock slope.

scholarly journals Safety Assessment of Tunnel Portals for Site Selection Based on Spatial Information Geoprocessing

2019 ◽  
Vol 4 (4) ◽  
pp. 70
Author(s):  
Iau-Teh Wang
Keyword(s):  
Information Technology ◽  
Slope Stability ◽  
Site Selection ◽  
Spatial Information ◽  
Slope Instability ◽  
Geographical Information ◽  
Site Evaluation ◽  
The Stability ◽  
Slice Method ◽  
Spatial Information Technology

The evaluation of portal locations for mountain tunnels is among the most crucial considerations during route selection and structural layout planning. The development of spatial information technology has provided a more objective approach for assessing the slope stability of potential portal sites. The simulations in such studies have been performed to evaluate potential hazards and slope stability. However, potential instabilities resulting from excavation are seldom considered in these studies. Therefore, a method based on spatial information technology was developed in this study for considering the potential impact of the direction and depth of excavations on portal stability. An analysis method for an infinite slope was integrated into the geographical information system for evaluating the stability of critical wedges. The proposed method provides a reasonable estimation comparable with that provided by the conventional slice method. The results of applying this method to six mountain tunnel portals where slope instability occurred during construction indicate that the actual outcomes agreed with the predicted outcomes. For potential portal site evaluation, the proposed method facilitates the rapid estimation of safety factors for various slope designations, which is useful for site selection.

Analysis and Study on Slope Stability of High Fill Subgrade

2014 ◽  
Vol 919-921 ◽  
pp. 637-640 ◽  
Author(s):  
Qi Zhang
Keyword(s):  
Finite Element Method ◽  
Slope Stability ◽  
Slope Failure ◽  
Lateral Displacement ◽  
Limit Equilibrium ◽  
Soil Deformation ◽  
High Slope ◽  
Calculation Results ◽  
External Conditions ◽  
The Stability

The slope failure of high fill embankment have a large proportion under self-weight and external conditions,Because of the complexity of the soil deformation and stress,General methods such as the limit equilibrium and numerical analysis have their own limitations,The paper takes high fill subgrade engineering in Fujian province as the background.Adopting analytical method and finite element method calculate the stability coefficient and lateral displacement of high fill embankment slope.moreover,Making a comprehensive judgement to the stability of the slope by comparing with the actual value.The results show that calculation results of these two methods are close.Which can make accurate predictions on high slope stability and determine a judgement.and provides an effective method for the design and construction of the similar project.

scholarly journals Numerical simulation of slope stability of the abandoned dreg site

2021 ◽  
Vol 233 ◽  
pp. 01062
Author(s):  
Xiao Wang ◽  
Zhigang Deng ◽  
Dong Ni ◽  
Dong Zhang ◽  
Jing Zhao
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Slope Stability ◽  
Rainfall Infiltration ◽  
Seepage Field ◽  
Stability Coefficient ◽  
Safety Coefficient ◽  
Rainfall Process ◽  
The Stability

A mathematical model of No. 1 abandoned dreg site of the newly-built highway from Xiangle village, Pingyao County to Hougou village, Qinyuan County was developed using GeoStudio software. The stability of the abandoned dreg site was simulated and analyzed under rainstorm. As a result, the influence of rainfall infiltration on slope seepage field is not limited to the rainfall process. The slope stability coefficient decreases significantly during the rainfall and the decreases slightly after the rainfall stopped due to continuous rainwater seepage. The minimum safety coefficient is 2.292 at 24h, greater than the allowable value, which demonstrates that the slope is stable.

scholarly journals Failure Analysis of Soil Slopes with Advanced Bayesian Networks

2019 ◽  
Author(s):  
Long Xue He ◽  
António Topa Gomes ◽  
Matteo Broggi ◽  
Michael Beer
Keyword(s):  
Slope Stability ◽  
Bayesian Networks ◽  
Slope Failure ◽  
Theoretical Background ◽  
Geotechnical Parameters ◽  
New Information ◽  
Different Types ◽  
Soil Slopes ◽  
The Stability ◽  
Geotechnical Problems

To prevent catastrophic consequences of slope failure, it can be effective to have in advance a good understanding of the effect of both, internal and external triggering-factors on the slope stability. Herein we present an application of advanced Bayesian networks for solving geotechnical problems. A model of soil slopes is constructed to predict the probability of slope failure and analyze the influence of the induced-factors on the results. The paper explains the theoretical background of enhanced Bayesian networks, able to cope with continuous input parameters, and Credal networks, specially used for incomplete input information. Two geotechnical examples are implemented to demonstrate the feasibility and predictive effectiveness of advanced Bayesian networks. The ability of BNs to deal with the prediction of slope failure is discussed as well. The paper also evaluates the influence of several geotechnical parameters. Besides, it discusses how the different types of BNs contribute for assessing the stability of real slopes, and how new information could be introduced and updated in the analysis.

scholarly journals Research on Search Method of Potential Sliding Surface of Rock Slope with Embedded Structural Plane

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Aijun Yao ◽  
Jian Lu ◽  
Zhizhou Tian ◽  
Yanyan Li
Keyword(s):  
Slope Stability ◽  
Rock Slope ◽  
Search Method ◽  
Distribution Characteristics ◽  
Sliding Surface ◽  
Structural Plane ◽  
Tracking Method ◽  
Empirical Assumption ◽  
Sliding Surfaces ◽  
The Stability

Slope stability has been a key issue in the field of geotechnical engineering. Determining the potential sliding surface of a slope is an important link in evaluating the stability of the slope. For rock slope with embedded structural plane, the potential sliding surface is greatly affected by the embedded structural plane. When determining the potential sliding surface, the influence of the position of the embedded structural plane should be considered. According to the distribution characteristics of the embedded structural plane of the rock slope, the structural plane in rock slope is divided into two types: (1) front embedded and (2) rear embedded structural plane. Considering the influence of two types of structural planes, a search method for potential sliding surfaces of rock slope is proposed combined with the finite random tracking method. The location of the sliding surface is controlled through the cut-in point, cut-out point, and arc height so that the range of search variables does not need empirical assumption. An engineering example is used to verify the search method. The results show that the method could accurately obtain the potential sliding surface of the rock slope with embedded structural plane, which proves the effectiveness of the search method.

scholarly journals Applying probabilistic method base on Monte Carlo simulation to analyze slope stability on route Nha Trang - Da Lat (within Khanh Vinh district, Khanh Hoa province)

2014 ◽  
Vol 17 (3) ◽  
pp. 76-85
Author(s):  
Danh Thanh Nguyen ◽  
Ngo Van Dau ◽  
Dung Quoc Ta
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Slope Stability ◽  
Soil Properties ◽  
Reliability Index ◽  
Slope Failure ◽  
Probabilistic Method ◽  
Optimal Designs ◽  
Engineering Practice ◽  
Method Base

In this paper, a Monte Carlo simulation used to analyze probabilistic slope stability. The results including: probabilistic slope failure and reliability index with respect to factor of safety under the effects of uncertainties in the parameters of soil properties. Base on this informations, geotechnical engineers how to get optimal designs to prevent slope failure. In addition, the purpose of this paper is to show that standard deviation of soil properties can be applied in simple ways, without more data, time, or effort than are commonly available in geotechnical engineering practice. Applying Monte Carlo simulation to evaluate probabilistic slope stability on route Nha Trang - Da Lat.

scholarly journals Performance Evaluation of Geometric Modification on the Stability of Road Cut Slope Using FE Based Plaxis Software

2021 ◽  
Author(s):  
Fentahun Ayalneh Mekonnen
Keyword(s):  
Performance Evaluation ◽  
Slope Stability ◽  
Slope Failure ◽  
Human Life ◽  
Slope Angle ◽  
Cut Slope ◽  
Governing Parameter ◽  
Stability Of Slope ◽  
The Stability ◽  
Steep Slopes

Slope failures are among the common geo-environmental natural hazards in the hilly and mountainous terrain of the world. Specially it is the major difficulty for the development of construction as it causes considerable damage on the infrastructure, human life and property. Different causes of slope failure and stabilization methods are proposed by different scholars. In this study the performance of geometric modification in slope stability was investigated using numerical method. The study uses slope height, slope angle and slope profile i.e. single slope, multi slope and bench slope as a governing parameter in the performance evaluation of geometric modification on the slope stability. The evaluation was conducted on a newly constructed road cut slope using a finite element based plaxis software. The result from performance evaluation of slope profiles show that geometric modification provides better and economical slope stability. The stability of slope decreases with increase in slope height and slope angle leading to an uneconomical design of high slopes in a single slope profile. However, the use of benching improves the stability of cut slope (i.e. the use of 2 m and 3 m bench improves the factor of safety by 7.5% and 12% from single slope profile). The method is more effective in steep slopes. Similarly, the use of a multi slope profile improves the stability of slope in stratified soil with varied strength. The performance is more significant when it is used in combination with benches. The study also provides comparison of slope profiles based on different criteria’s and recommend the selection profile based on site-specific considerations.

Influence of laterally loaded sleeved piles and pile groups on slope stability

2001 ◽  
Vol 38 (3) ◽  
pp. 553-566 ◽  
Author(s):  
C WW Ng ◽  
L M Zhang ◽  
K KS Ho
Keyword(s):  
Slope Stability ◽  
Dimensional Analysis ◽  
High Speed ◽  
Slope Failure ◽  
Load Transfer ◽  
Large Diameter ◽  
Three Dimensional ◽  
Pile Groups ◽  
The Stability ◽  
Laterally Loaded

Many high-rise buildings, bridges, and transmission towers are constructed on steep slopes in Hong Kong and are supported by large-diameter piles. These structures may be subjected to large lateral loads, such as those caused by typhoons, earthquakes, and high-speed vehicles. The margin of safety of the slope may decrease as a result of stresses transferred from the piles to the slope. To minimize the transfer of lateral load from the buildings to the shallow depths of the slope, an annulus of compressible material (sleeving) is sometimes formed between the piles and the adjacent soils. In this paper, a three-dimensional analysis is carried out to investigate the effects of unsleeved and sleeved single piles and pile groups on the stability of a cut slope. Mechanisms of load transfer from the piles to the slope are studied. The stability of the slope is evaluated using the strength reduction technique. The evolution of slope failure is examined and the factors of safety for both initiation of instability and global failure of the slope are identified from the numerical analyses. The sleeving technique is found to be capable of significantly reducing the stresses in the shallow depths of the slope in front of the piles, thus improving the local stability of the slope, but offers limited benefit with respect to global stability.Key words: laterally loaded pile and pile group, sleeving, slope stability, three-dimensional analysis, load transfer mechanism, factor of safety.

scholarly journals A Non-Linear, Time-Variant Approach to Simulate the Rainfall-Induced Slope Failure of an Unsaturated Soil Slope: A Case Study in Sapa, Vietnam

2021 ◽  
Vol 16 (4) ◽  
pp. 512-520
Author(s):  
The Viet Tran ◽  
Hoang Viet Hung ◽  
Huy Dung Pham ◽  
Go Sato ◽  
Hoang Hiep Vu ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Unsaturated Soil ◽  
Slope Failure ◽  
The United States ◽  
Slope Stability Analysis ◽  
Rainfall Infiltration ◽  
Landslide Event ◽  
Non Linear ◽  
The Stability

In this study, the Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability Analysis (TRIGRS), v2.1 program, and module SLOPE/W in the Geostudio package were adopted for assessing rainfall-induced slope failure. TRIGRS was developed by the United States Geological Survey to determine the time-varying groundwater table at the regional scale under rainfall infiltration. The program employs partial differential equations represented by one-dimensional vertical flow in homogeneous materials for unsaturated conditions. With the application of a simple runoff routing scheme combined with the mass balance between rainfall, infiltration, and runoff over the study area, the distribution of the transient pore-water pressures within the entire landscape was simulated considering both the surface and subsurface flow. Additionally, compared to the traditional two-dimensional approach, the topographical conditions were also considered during the groundwater simulation. For conducting the slope stability analysis, a typical cross-section was constructed based on the site description. The predicted water-tables at the observed time of failure of the typical section were extracted and used in SLOPE/W to conduct the time-dependent modelling of rainfall-induced slope failures. In this study, the non-linear method was employed for simulating unsaturated soil shear strength, and the stability of the slope was evaluated using Bishop’s simplified method. We applied the approach to the landslide event that occurred on August 5, 2019, in Sapa district, Lao Cai province, Vietnam. The event resulted in severe damage and blocked the road for days. The predicted results on the stability of the slope as the factor of safety were compared with the actual slope failure during the event. The results showed that, by inputting accurate data, the applied approach could provide valuable evidence about the time of the slope failure.

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