Undrained stability of unsupported conical slopes in two-layered clays

Yodsomjai, Wittawat; Keawsawasvong, Suraparb; Thongchom, Chanachai; Lawongkerd, Jintara

doi:10.1007/s41062-020-00384-x

Cited by 30 publications

(8 citation statements)

References 36 publications

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“…In previous studies, water content was found to be an important factor affecting slope stability [ 27 , 28 , 29 , 30 , 31 ]. This article comes to the consistent conclusion from laboratory experiments that when the water content increased from 20% to 40%, the cohesion and internal friction angle of the clay decreased by about 60% and 67%, respectively, and the cohesion and internal friction angle of the silt soil decreased by about 61% and 43%, respectively ( Table 4 ).…”

Section: Discussionmentioning

confidence: 99%

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Experimental and Numerical Calculation Study on the Slope Stability of the Yellow River Floodplain from Wantan Town to Liuyuankou

Wang

Liu

et al. 2023

Toxics

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More than two million people live on the floodplains along the middle and lower streams of the Yellow River. The rapid development of industry and agriculture on both sides of the Yellow River has caused serious pollution of the floodplain soil. Erosion by water has led to the destruction of the floodplain which has not only compressed people’s living space but also resulted in a large amount of sediment containing heavy metals entering the river, aggravating water pollution. To further study the law governing the release of pollutants in soil, this work, based on field surveys of the Yellow River floodplain slopes from Wantan town to Liuyuankou, was focused on determining the failure mechanism and laws for the floodplain slope through the combination of a flume experiment and numerical calculations. The results showed that the floodplain slopes, composed of clay and silty sand, presented an interactive structure. Under the action of water erosion, the slope was first scoured to form a curved, suspended layer structure, and then the upper suspended layer toppled. The bank stability coefficient decreased by about 65% when the scour width increased from 0.07 m to 0.42 m, and the water content increased from 20% to 40%. For the failure characteristics, the angle of the failure surface was negatively correlated with the scour width, and the distance from the top failure surface to the bank edge was about 2.5 times that of the scour width.

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Section: Discussionmentioning

confidence: 99%

“…Dapporto studied the failure mechanism in a riverbank with a dual structure of sand and clay [ 28 ]. Yodsomjai studied the stability of double-layer conical slopes [ 29 ]. Li evaluated the stability of a three-layer slope composed of two cohesive soil layers and backfill soil [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Calculation Study on the Slope Stability of the Yellow River Floodplain from Wantan Town to Liuyuankou

Wang

Liu

et al. 2023

Toxics

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“…For homogeneous soil, the bearing capacity can be expressed as a stability factor N c = σ s / c u 13 . Hence, the stability factor N c can be defined as follows where σ s is the surcharge load, c u 1 , c u 2 and γ are the undrained shear strength of top layer, bottom layer and unit weight of soil, which follows the Tresca failure criterion 3 , 11 – 13 , 18 , 19 . The unit weight is fixed as 20 kN/m 3 .…”

Section: Problem Definitionmentioning

confidence: 99%

Undrained stability of dual tunnels in layered soils with different strength

Zeng

2022

Sci Rep

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The stability of dual circle tunnels buried in layered soils with different shear strengths was investigated by using finite element limit analysis (FELA). The emphasis of this study is in quantitating that the existing tunnels affects the newly-built one, and design suggestions have been provided especially in the optimum location of construction. By imposing a FELA modelling, the variation trends of undrained bearing capacity with different influential factors, including the horizontal distance, vertical distance, the thickness of the top layer, the shear strength ratio of the layered soil, were further investigated. It is concluded that there exists an inclination-fixed worst-band, in which there would be a worst undrained stability once the bottom tunnel was constructed in the band. It is interested that the inclination seems constant by varying several factors but the horizontal distance would be changed with the soil properties. In addition, three patterns of collapse were summarized.

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“…The purpose of using iterative loops in the analysis is to obtain the converged FS result thereby avoiding the FS obtained directly form the initially assumed values enhancing the accuracy of the analysis. While in this work only circular failure surface is considered for analysis, the primary focus is upon the effects of various (external) parameters upon the stability analysis of homogeneous as well as heterogeneous (layered) [40] soil slope. These parameters include pore water pressure (μ), surcharge loading (q, kN/m 2 ), horizontal seismic coefficient (k h ), and vertical seismic coefficient (k v ).…”

Section: Introductionmentioning

confidence: 99%

A Generalized Limit Equilibrium-Based Platform Incorporating Simplified Bishop, Janbu and Morgenstern–Price Methods for Soil Slope Stability Problems

Alok,

Burman,

Samui

et al. 2024

Advances in Civil Engineering

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Limit equilibrium (LE) method is the most widely used method for slope stability analysis. Different methods based on the LE technique for the analysis of the stability of the slope have been developed. Some are based on satisfying the force equilibrium condition of the failing mass (Janbu’s method), while some focus on satisfying the moment equilibrium condition (Bishop’s method). Among these methods, the most accurate result is provided by the Morgenstern–Price method as it not only satisfies both moments as well as a force equilibrium condition but also considers the interslice shear forces (Vi) and interslice normal forces (Ei), which are neglected by most of the LE methods to avoid the condition of indeterminacy. To accommodate these forces, Morgenstern–Price (MP) gave a relation between the Vi and Ei which depends upon a scaling multiplier (λ). Thus, it becomes necessary to evaluate λ value along with the factor of safety (FS). There is barely any work discussing the detailed methodology of evaluation of λ along with FS. Method for obtaining λ along with FS have been developed and elaborated in details here. While calculating FS (MP method), evaluation of Ei is a must which is dependent upon the values of normal force at the base of each slice (Ni) and FS, which itself is dependent upon the value of Ei, making it a loop of interdependent variables. To avoid this interdependency of above stated variables, a separate formulation of Ei is given which reduces the calculations (run-time) involved. A VBA code-based platform has also been developed incorporating the generalized LE method, including Bishop’s, Janbu’s, and Morgenstern–Price methods which are represented in the form of flowcharts in this work.

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Undrained stability of unsupported conical slopes in two-layered clays

Cited by 30 publications

References 36 publications

Experimental and Numerical Calculation Study on the Slope Stability of the Yellow River Floodplain from Wantan Town to Liuyuankou

Experimental and Numerical Calculation Study on the Slope Stability of the Yellow River Floodplain from Wantan Town to Liuyuankou

Undrained stability of dual tunnels in layered soils with different strength

A Generalized Limit Equilibrium-Based Platform Incorporating Simplified Bishop, Janbu and Morgenstern–Price Methods for Soil Slope Stability Problems

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