Development of shear deformation due to the increase of pore pressure in a sandy model slope during rainfall

Sasahara, Katsuo; Sakai, Naoki

doi:10.1016/j.enggeo.2013.12.005

Cited by 35 publications

(10 citation statements)

References 10 publications

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“…The model showed that with increased displacement, the wave velocities decreased rapidly. The displacement–time relationship before failure of the soil, defined as the creep of the soil [28], could be observed in this test. Therefore, wave velocities can be used to detect the creep of the soil.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Soil Moisture and Shear Deformation Based on Compression Wave Velocities in a Shallow Slope Surface Layer

Tao

Uchimura

Fukuhara

et al. 2019

Sensors

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Rainfall-induced landslides occur commonly in mountainous areas around the world and cause severe human and infrastructural damage. An early warning system can help people safely escape from a dangerous area and is an economical and effective method to prevent and mitigate rainfall-induced landslides. This paper proposes a method to evaluate soil moisture and shear deformation by compression wave velocities in a shallow slope surface layer. A new type of exciter and new receivers have been developed using a combination of micro electro-mechanical systems (MEMS) accelerometers and the Akaike’s information criterion (AIC) algorithm, which can automatically calculate the elastic wave travel time with accuracy and reliability. Laboratory experiments using a multi-layer shear model were conducted to reproduce the slope failure. The relationships between wave velocities and soil moisture were found to be dependent on the saturation path (rain or drain); in other words, hysteresis was observed. The wave velocity ratio reduced by 0.1–0.2 when the volumetric water content (VWC) increased from 0.1 to 0.27 m3/m3. When loading the shear stress corresponding to slope angles of 24, 27, 29, or 31 degrees, a drop of 0.2–0.3 in wave velocity ratio was observed at the middle layer, and near 0.5 at the bottom layer. After setting the shear stress to correspond to a slope angle of 33 degrees, the displacement started increasing and finally, slope failure occurred. With increasing displacement, the wave velocities also decreased rapidly. The wave velocity ratio dropped by 0.2 after a displacement of 3 mm. Monitoring long-term elastic wave velocities in a slope surface layer allows one to observe the behavior of the slope, understand its stability, and then apply an early warning system to predict slope failure.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Soil Moisture and Shear Deformation Based on Compression Wave Velocities in a Shallow Slope Surface Layer

Tao

Uchimura

Fukuhara

et al. 2019

Sensors

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“…When they hit a sandcastle, they destroy the structure of the sandcastle and change the water content of the sandcastle. erefore, we divide the impact of rain on sandcastles into two parts: scour and infiltration [20,21].…”

Section: Model Preparationmentioning

confidence: 99%

Optimal Simulation of Sandcastle Life in Dynamic Environment Based on Stability Principle

Yang

Jiang

Tang

et al. 2020

Discrete Dynamics in Nature and Society

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This paper mainly studies to explore a three-dimensional geometric model including three modules of a sandcastle foundation with optimal stability. Firstly, based on the knowledge of streamline structure, structural mechanics, and fluid mechanics, the most stable sand pile foundation model under the action of tidal current and wave is established. Secondly, by limiting the degree of allowable aggregation, the discrete global optimization algorithm based on the continuous descent method is adopted to find out the optimal water-sand ratio. Finally, we apply the above results to verify the reliability of the optimal model by comprehensively considering the influence of rainfall factors on sandcastles.

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“…However, in an actual project, besides an increase in the rock mass unit weight and slope sliding force, the slope failure is also affected by rainfall, reservoir water level fluctuations, etc. [1][2][3]18]. Chen and Zhang [19] proposed a physically based distributed cell model to predict regional rainfall-induced shallow slope failures in two-layer soils under realistic rainfall conditions.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

et al. 2020

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In the construction of high dams, many high rock slope failures occur due to flood discharge atomized rain. Based on the steel frame lifting technique and strength reduction materials, a comprehensive method is proposed in this paper to study the stability of high bedding rock slope subjected to atomized rain. The safety factor expression of the comprehensive method and the evaluation method for deformation instability were established according to the similarity theory of geomechanical model, failure criterion, and mutation theory. Strength reduction materials were developed to simulate the strength reduction of structural planes caused by rainfall infiltration. A typical test was carried out on the high bedding rock slope in the Baihetan Hydropower Station. The results showed that the failure modes of the bedding rock slope were of two types: sliding–fracturing and fracturing–sliding. The first slip block at the exposed place of the structural plane was sliding–fracturing. Other succeeding slip blocks were mainly of the fracturing–sliding type due to the blocking effect of the first slip block. The failure sequence of the slip blocks along the structural planes was graded into multiple levels. The slip blocks along the upper structural planes were formed first. Concrete plugs had effective reinforcement to improve the shear resistance of the structural planes and inhibit rock dislocation. Finite element method (FEM) simulation was also performed to simulate the whole process of slope failure. The FEM simulation results agreed well with the test results. This research provides an improved understanding of the physical behavior and the failure modes of high bedding rock slopes subjected to atomized rain.

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Development of shear deformation due to the increase of pore pressure in a sandy model slope during rainfall

Cited by 35 publications

References 10 publications

Evaluation of Soil Moisture and Shear Deformation Based on Compression Wave Velocities in a Shallow Slope Surface Layer

Evaluation of Soil Moisture and Shear Deformation Based on Compression Wave Velocities in a Shallow Slope Surface Layer

Optimal Simulation of Sandcastle Life in Dynamic Environment Based on Stability Principle

Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

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