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Early-warning system with fiber optic sensor networks and stability evaluation with model updating analysis
Published in Airong Chen, Xin Ruan, Dan M. Frangopol, Life-Cycle Civil Engineering: Innovation, Theory and Practice, 2021
The slope stability is a very important issue during and after the construction of slope excavation (Chen et al. 2017; Jiang & Zhou 2017; Sun et al. 2018). It is of great significance to establish early-warning system with fiber optic sensor networks and stability analysis for safety. The fiber optic sensor networks were widely adopted as a newly advanced sensing technology to measure the full-distributed strain of slope for longtime (Xu & Yin 2016). However, slope stability analysis is related to many factors, such as field construction, rainfall and changes in groundwater levels. These external factors could affect the strength of the soil mass. Although soil parameters can be measured in field tests or in the laboratory, stability analysis using these soil parameters as mechanical parameters of numerical models may cause inaccurate results due to the spatial variability of soil, field observation data, and the disturbance of the construction process (Cao et al. 2016; Jiang et al. 2018; Li et al. 2014). Thus, accurately obtain the soil parameters is a key problem for stability analysis.
Rock slope stability
Published in Ivan Gratchev, Rock Mechanics Through Project-Based Learning, 2019
Slope stability analysis is a procedure that engineers employ to assess the stability of natural and man-made slopes. It involves the use of the factor of safety (FS), which is defined as the ratio between the available and required strength (Equation 11.1): FS=AvailablestrengthRequiredstrength where the available strength is the maximum strength of soil mass as given in Equation 8.4 and the required strength is the strength that is necessary to keep the slope stable.
Shear strength of soil
Published in Ivan Gratchev, Dong-Sheng Jeng, Erwin Oh, Soil Mechanics Through Project-Based Learning, 2018
Ivan Gratchev, Dong-Sheng Jeng, Erwin Oh
Slope stability analysis is a procedure that engineers employ to assess the stability of natural and man-made slopes. It involves the use of factor of safety (FS), which is defined as the ratio between the available and required strength: FS=AvailablestrengthRequiredstrength where the available strength is the maximum strength of soil mass as given in Equation (11.1) and the required strength is the strength that is necessary to keep the slope stable. When FS > 1, the slope is considered to be stable; for FS < 1, we assume that the slope fails; if FS = 1, the slope is under critical conditions.
Assessing the deformation and stability of a slope using an improved strength reduction method
Published in International Journal of Geotechnical Engineering, 2022
Shuai Zhang, Chao Hu, Shuang Zheng, Zhuo Chen
Landslides, as a significant kind of natural hazards, pose serious impact on human lives and properties. From 2004 to 2016, 463 landslides not caused by seismic effect had happened in China alone, and these events caused 4,718 recorded deaths and nearly 981.29 USD million property damage (Zhang and Huang 2018). However, landslides are considerably difficult to predict due to the characteristics of complex geomorphology and geology setting, randomness of rock or soil mechanical parameters, and unperfected prediction methods. For judging whether a potential landslide is under stability state or not, slope stability analysis is a crucial step. If the FOS derived by the slope stability analysis is lower than a prescribed value, the slope should be reinforced by engineering measures to avoid landslide occurrence (e.g. anti-slide pile, retaining wall and bolt). In the past decades, many different methods have been developed for slope stability analysis, e.g. the limit equilibrium method (LEM) and the finite element method (FEM).
Numerical modelling of rainfall effects on the stability of soil slopes
Published in International Journal of Geotechnical Engineering, 2019
Adarsh S. Chatra, G. R. Dodagoudar, V. B. Maji
Traditionally, slope stability analysis is analysed using limit equilibrium approach. Over the years, finite element/finite difference method with shear strength reduction (SSR) technique has been applied to the practical slope stability analysis (Zienkiewicz, Humpheson, and Lewis 1975; Ugai 1989; Dawson, Roth, and Drescher 1999; Griffiths and Lane 1999). Studies have shown that the SSR technique is a reliable and robust approach to assess the safety factor of the slope and locating the corresponding critical slip surface. One of the main advantages of the SSR technique is that the failure surface is found automatically through the zones within the material where shear stresses overcome the shear strength of the material. The SSR technique does not have the concept of slices, hence there is no need for the assumption about inter slice side forces.
Yield acceleration of reinforced soil slopes
Published in International Journal of Geotechnical Engineering, 2020
Amin Keshavarz, Habibeh Abbasi, Abdoreza Fazeli
Common methods of slope stability analysis include limit equilibrium, limit analysis and numerical methods such as finite elements and finite differences. The limit equilibrium method was first used by Coulomb for the soil mechanics problems in late eighteenth century. In the Horizontal Slice Method (HSM), the failure wedge is divided into horizontal slices and the equilibrium equations are satisfied for all of the slices in different directions. Considering the variation in the pseudo-static (PS) coefficient with depth is one of the advantages of this method compared to the vertical slice method.