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Articles 1 - 14 of 14
Full-Text Articles in Geotechnical Engineering
Slope Stability Of An Unsaturated Embankment With And Without Natural Pore Water Salinity Subjected To Rainfall Infiltration, Sadeghi Hamed, Kolahdooz Ali, Ahmadi Mohammad-Mehdi
Slope Stability Of An Unsaturated Embankment With And Without Natural Pore Water Salinity Subjected To Rainfall Infiltration, Sadeghi Hamed, Kolahdooz Ali, Ahmadi Mohammad-Mehdi
Rock and Soil Mechanics
Natural soils contain a certain amount of salt in the form of dissolved ions or electrically charged atoms, originated from the long-term erosion by acidic rainwater. The dissolved salt poses an extra osmotic water potential being normally neglected in laboratory measurements and numerical analyses. However, ignorance of salinity may result in overestimation of stability, and the design may not be as conservative as thought. Therefore, this research aims to first experimentally examine the influence of pore water salinity on water retention curve and saturated permeability of natural dispersive loess under saline and desalinated conditions. Second, the measured parameters are used …
System Failure Probability Analysis Of Cohesive Slope Considering The Spatial Variability Of Undrained Shear Strength, Hui Liu, Jun-Jie Zheng, Rong-Jun Zhang
System Failure Probability Analysis Of Cohesive Slope Considering The Spatial Variability Of Undrained Shear Strength, Hui Liu, Jun-Jie Zheng, Rong-Jun Zhang
Rock and Soil Mechanics
A system failure probability analysis method of cohesive slope considering the spatial variability of undrained shear strength is proposed. In this method, the local averaging parameter of the random field of undrained shear strength on slip surface is introduced as an equivalent parameter. The statistical characters of the equivalent parameter and the correlation coefficient between different equivalent parameters are formulated. Then, the reliability index of a single failure mode and the correlation coefficient between different failure modes are calculated based on the equivalent parameters. By considering both the reliability index and correlation coefficient between different failure modes, the representative slip …
One Package Of Schemes For Some Difficult Issues In Finite Element Plasticity Analysis, Hong Zheng, Tan Zhang, Qiu-Sheng Wang
One Package Of Schemes For Some Difficult Issues In Finite Element Plasticity Analysis, Hong Zheng, Tan Zhang, Qiu-Sheng Wang
Rock and Soil Mechanics
The Mohr-Coulomb yield criterion takes on the simplest form in the Mohr stress space, which has thus been most extensively applied in limit analysis and limit equilibrium methods because of its accuracy. However, the Mohr-Coulomb yield surface in the stress space is non-smooth, causing huge troubles to the constitutive integration in the deformation based finite element plasticity analysis. In addressing strength problems, meanwhile, solvers based on the load controlled method (LCM) are hard to bring the finite element model to the limit equilibrium state. Aiming at these issues, the solution schemes are proposed as follows. First, an algorithm named GSPC …
A Study On The Rainfall Infiltration Of Granite Residual Soil Slope With An Improved Green-Ampt Model, Yong-Liang Pan, Wen-Xing Jian, Lin-Jun Li, Yu-Qiu Lin, Peng-Fei Tian
A Study On The Rainfall Infiltration Of Granite Residual Soil Slope With An Improved Green-Ampt Model, Yong-Liang Pan, Wen-Xing Jian, Lin-Jun Li, Yu-Qiu Lin, Peng-Fei Tian
Rock and Soil Mechanics
Granite residual soil is widely distributed in southern China, and it has many poor physical and mechanical properties. Slopes of this type of soil are prone to deformation and failure under the action of rainfall. Therefore, it is of great significance to study the rainfall infiltration mechanism in granite residual soil slopes. On the basis of Green-Ampt model, the initial moisture content, underground water level and unsaturated characteristics of the soil are comprehensively considered. An infiltration model suitable for different rainfall conditions is established, and verified by comparison between numerical simulations and other models. Then, the proposed model is used …
Stability Analysis Of Slope Based On Green-Ampt Model Under Heavy Rainfall, Yong-Hua Su, Cheng-Cheng Li
Stability Analysis Of Slope Based On Green-Ampt Model Under Heavy Rainfall, Yong-Hua Su, Cheng-Cheng Li
Rock and Soil Mechanics
The method of rainfall infiltration analysis directly affects the prediction and prevention of rainfall-induced landslides. Green-Ampt (GA) model, which has clear physical meaning and few parameters, has been paid more and more attention in the analysis of rainfall-induced landslides. However, this method ignores the existence of the unsaturated layer of the wetting layer and the seepage of the saturated layer, which affects the calculation accuracy. In view of the above deficiencies, the LSGA model is established based on the stratified hypothesis and the saturated layer seepage, and the expression of slope stability coefficient is established. All results show that LSGA …
A Study Of Water Content Distribution And Shallow Stability Of Earth Slopes Subject To Rainfall Infiltration, Zhen-Ning Shi, Shuang-Xing Qi, Hong-Yuan Fu, Ling Zeng, Zhong-Ming He, Rui-Min Fang
A Study Of Water Content Distribution And Shallow Stability Of Earth Slopes Subject To Rainfall Infiltration, Zhen-Ning Shi, Shuang-Xing Qi, Hong-Yuan Fu, Ling Zeng, Zhong-Ming He, Rui-Min Fang
Rock and Soil Mechanics
A rainfall infiltration test model which enables the measurement of the volumetric water content of soil is designed. The distribution and variation of the initial water content under rainfall infiltration are obtained through the test. Based on these results, a novel method for shallow stability analysis of earth slopes subject to rainfall infiltration is proposed by combining the unsaturated shear strength theory and the limit equilibrium method. The proposed method is then applied to study the stability of a soil slope along the Qili connecting line of Hang-Xin-Jing Expressway. The main findings are as follows: The inverse proportion function characterized …
Stability Analysis And Design Charts For A Sandy Soil Slope Supporting An Embedded Strip Footing, Emmanuel Baah-Frempong, Sanjay Kumar Shukla
Stability Analysis And Design Charts For A Sandy Soil Slope Supporting An Embedded Strip Footing, Emmanuel Baah-Frempong, Sanjay Kumar Shukla
Research outputs 2014 to 2021
In several field situations, especially in the hilly terrains, the construction of footings on slopes becomes essential. The factor of safety of a slope supporting a loaded footing on the crest is dependent on the position of the footing from the crest edge. Most studies in the past have focused on analysing the bearing capacity and settlement behaviour of a footing resting on a slope crest, but foundations in most infrastructure projects are usually built at some depth below the ground surface. Therefore, the availability of some form of design charts for determining the factor of safety of a slope …
Modelling Tree Contribution In Susceptibility Analysis Of Shallow Llandslides, Roberto José Marín Sánchez, Juan Pablo Osorio
Modelling Tree Contribution In Susceptibility Analysis Of Shallow Llandslides, Roberto José Marín Sánchez, Juan Pablo Osorio
Articles
In this paper an assessment of shallow landslides susceptibility in a tropical and mountainous terrain is made. A method that allows to model slope stability over large areas is used. Tree contribution is quantified by means of three parameters: rainfall interception, root reinforcement and tree surcharge. A rainfall interception model is used to determine the rain available for infiltration and its temporal distribution during the simulation. The hydrological models included in TRIGRS are described, which allows to determine the pore water pressure depending on the initial conditions. This pore water pressure is used in the revised infinite slope stability model, …
Geology Influence In The Slope Stability Analysis By Limit Equilibrium, Finite Elements And Random Finite Elements Methods, Juan Camilo Viviescas, Juan Pablo Osorio
Geology Influence In The Slope Stability Analysis By Limit Equilibrium, Finite Elements And Random Finite Elements Methods, Juan Camilo Viviescas, Juan Pablo Osorio
Conference papers
Slope stability analyzes correspond to the evaluation of the safety factors commonly performed through the limit equilibrium and finite element methods. Due to the uncertainty of the geotechnical parameters, different statistical methods have emerged such as the limit equilibrium combined with the Monte Carlo simulation method and the random finite elements, which have been widely accepted in recent years. Normally, these analyzes are not performed taking into account the geological influence on the geotechnical properties, so in this work we proceed with the comparison of several geometrical typologies of slopes for mudflows and a residual soils of the Stock San …
Effects Of Vegetation On Slope Stability: A Review, Roberto José Marín Sánchez, Juan Pablo Osorio
Effects Of Vegetation On Slope Stability: A Review, Roberto José Marín Sánchez, Juan Pablo Osorio
Articles
Slope stability is usually affected by factors that reduce soil strength and increase driving forces acting on the slope material, sometimes generating mass movements. Among these factors, vegetation has an important role related to hydrological (e.g. evapotranspiration and infiltration) and mechanical (e.g. tree surcharge and root reinforcement provided by trees) mechanisms. In this review, vegetation influences associated to slope stability are identified, describing the mechanisms involved in the occurrence of mass movements. Finally, the way these factors affect slope stability is explained according to soil properties, climatic conditions and environmental characteristics.
Evaluation Of Slope Stability Quantifying The Effect Of Vegetation, Roberto José Marín, Juan Pablo Osorio
Evaluation Of Slope Stability Quantifying The Effect Of Vegetation, Roberto José Marín, Juan Pablo Osorio
Conference papers
The present study evaluates the shallow landslides susceptibility triggered by rainfall by means of multiple numerical simulations. The simulations integrate a transient rainfall infiltration model with an infinite slope stability model, both of them developed for unsaturated soils in a basin scale. TRIGRS’ infiltration model is used to calculate pore water pressure. The geotechnical model includes the evaluation of two parameters related to vegetation: root reinforcement and tree surcharge due to the weight of the vegetation. These simulations were carried out using multiple values of these parameters so that their behavior is analyzed for the topographic conditions of the watershed …
Slope Stability Enhancement Of An Upstream Tailings Dam: Laboratory Testing And Numerical Modelling, Yazeed A. Alsharedah
Slope Stability Enhancement Of An Upstream Tailings Dam: Laboratory Testing And Numerical Modelling, Yazeed A. Alsharedah
Electronic Thesis and Dissertation Repository
Mine tailings are the byproduct of mining activities, which need to be disposed of once the ore is extracted. They can be disposed of in either dry or wet forms. The latter is most common with the tailings being disposed of in the form of slurry inside retention structures. The retention structure may be a natural, manmade, or built dam, which is the case in most of nowadays mining locations. In this thesis, improving the stability of an upstream tailings dam using soil additives is investigated. The experimental phase of this study involved laboratory tests conducted to characterize mine tailings …
Stability, Erosion, And Morphology Considerations For Sustainable Slope Design, Isaac Andres Jeldes Halty
Stability, Erosion, And Morphology Considerations For Sustainable Slope Design, Isaac Andres Jeldes Halty
Doctoral Dissertations
The construction of more natural and sustainable earth slopes requires the consideration of erosion and runoff characteristics as an integral part of the design. These effects not only result in high costs for removal of sediment, but also a profound damage to the ecosystem. In this dissertation, innovative techniques are developed such that more natural appearing slopes can be designed to minimize sediment delivery, while meeting mechanical equilibrium requirements. This was accomplished by: a) examining the fundamental failure modes of slopes built with minimum compaction (FRA) to enhance quick establishment of forest, b) investigating the geomechanical and erosion stability of …
A Case History Of Site Instability Due To The Presence Of A Shale Layer Above Sloping Bedrock, Sanjeev Kumar, Braja M. Das, Michael L. Hall
A Case History Of Site Instability Due To The Presence Of A Shale Layer Above Sloping Bedrock, Sanjeev Kumar, Braja M. Das, Michael L. Hall
International Conference on Case Histories in Geotechnical Engineering
A study conducted for St. Louis County of Missouri, United States of America classified several areas of the county as unstable for any type of construction because of the presence of high plastic shaley clay or clayey shale on sloping bedrock. These areas are considered to have a potential for site instability to occur due to any change in natural conditions that may increase the moisture content of the high plastic shaley clay or clayey shale. A two-story parking garage, founded on shallow foundations, constructed in one of the potentially unstable zones, showed some movement after several years of its …