Constitutive flow behavior of a municipal solid waste simulant at post-failure: experimental and numerical investigations

Nat. Hazards Earth Syst. Sci.

Deng

et al. 2018

Self Cite

Abstract. Flow-like landslides, such as flow slides and debris avalanches, have caused serious infrastructure damage and casualties for centuries. Effective numerical simulation incorporating accurate soil mechanical parameters is essential for predicting post-failure landslide mobility. In this study, smoothed particle hydrodynamics (SPH) incorporating soil ring shear test results were used to forecast the long-runout mobility for a landslide on an unstable slope in China. First, a series of ring shear tests under different axial stresses and shear velocities were conducted to evaluate the residual shear strength of slip zones after extensive shear deformation. Based on the ring shear test results, SPH modeling was conducted to predict the post-failure mobility of a previously identified unstable slope. The results indicate that the landslide would cut a fire service road on the slope after 12 s and cover an expressway at the foot of that slope after 36 s. In the model, the landslide would finally stop sliding about 38 m beyond the foot of the slope after 200 s. This study extends the application of the SPH model from disaster simulations to predictive analysis of unstable landslide. In addition, two sets of comparative calculations were carried out which demonstrate the robustness of the SPH method.

Section: Shear Ratesupporting

confidence: 92%

Section: Ring Shear Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Forecasting landslide mobility using an SPH model and ring shear strength tests: a case study

Nat. Hazards Earth Syst. Sci.

Deng

et al. 2018

Self Cite

“…A ring-shear instrument (Figure 1a) from Geotechnical Consulting & Testing Systems Company was used in the experiment. This instrument provides a uniform shear rate and an unlimited rotation angle [26]. The sample had an outer diameter of 150 mm, inner diameter of 100 mm, and height of 20 mm (which met the requirement of height > 10 × particle diameter).…”

Section: Materials and Methods Of Ring-shear Testmentioning

confidence: 99%

Effects of Crushing Characteristics on Rheological Characteristics of Particle Systems

Wang

2022

Water

Self Cite

A particle system’s large-deformation shear flow exhibits obvious random characteristics, making accurate modeling of the particle system difficult. Particle systems, which are frequently used in engineering, are prone to breakage, which introduces additional uncertainty into the system. The purpose of this study was to conduct ring-shear experiments on a variety of common engineering materials in order to quantify the effect of the dynamic crushing process of the particle system on the instability of shear flow. Different shear fracture characteristics may result in a change in the volume trend of the system, from dilatancy to shrinkage. While the mean value of the crushable system’s stress ratio does not increase with shear rate, the stress ratio’s fluctuation characteristic parameters are negatively correlated with shear rate. As particles become more easily sheared, the initial value of the stress ratio fluctuation increases. The effect of shear rate on the fluctuation in the system stress ratio is determined indirectly by the degree of system fragmentation. The study of the particle system’s fluctuation characteristics will aid in developing a stochastic dynamic model for the landslide system in the future, allowing for improved prediction and prevention of landslide disasters.

“…Sci. the shear behavior for large shear displacements cannot be assessed by these methods (Dai et al 2016). Ring shear tests, which can impart extremely large shear strains, may be the ideal laboratory tool for extensive shear deformation testing (Okada et al 2007; ASTM Standard D7608-10, 2010).…”

Section: Introductionmentioning

confidence: 99%

Forecasting post-failure landslide mobility using a SPH model and data from ring shear strength tests: A case study

Deng

et al. 2018

Preprint

Self Cite

Abstract. Flowlike landslides, such as flowslides and debris avalanches, have caused serious infrastructure damage and casualties for centuries. Effective numerical simulation incorporating accurate soil mechanical parameters is essential for predicting post-failure landslide mobility. In this study, smoothed particle hydrodynamics (SPH) incorporating soil ring shear test results was used to forecast the long-runout mobility for a landslide on an unstable slope in China. First, a series of ring shear tests under different axial stresses and shear velocities were conducted to evaluate the residual shear strength of slip zones after extensive shear deformation. Based on the ring shear test results, SPH modeling was conducted to predict the post-failure mobility of a previously identified unstable slope. The results indicate that the landslide would cut a fire road on the slope after 12 s and cover an expressway at the foot of that slope after 36 s. In the model, the landslide would finally stop sliding about 25 m beyond the foot of the slope after 120 s. This study shows that combining the SPH method with ring shear test results to forecast landslide mobility can provide basic information for landside disaster mitigation.