A micro-mechanical model for unsaturated soils based on DEM

Liu, Xin; Zhou, Annan; Shen, Shui-Long; Li, Jie; Sheng, Daichao

doi:10.1016/j.cma.2020.113183

Cited by 40 publications

(10 citation statements)

References 84 publications

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“…Introducing the variables 𝜙 1 = ũa + 𝑞 12 ũw and 𝜙 2 = 𝑞 21 ũa + ũw into Equations ( 26) and (27), respectively, gives:…”

Section: A2mentioning

confidence: 99%

“…[21][22][23][24][25][26] In the past decades, many scholars have been aware of the importance of unsaturated soil, and have paid more and more attention to the unsaturated soil mechanics. [27][28][29][30][31][32] With the great progress made, many well-developed consolidation theories for unsaturated soils have been available. Barden 31 pioneered the analysis of 1D consolidation of compacted unsaturated clay.…”

Section: Introductionmentioning

confidence: 99%

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Elliptical cylindrical equivalent model for consolidation of unsaturated soil improved by PVD

Tian

Jiang

et al. 2022

Num Anal Meth Geomechanics

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To consider the shape effect of prefabricated vertical drain (PVD), the elliptical cylindrical equivalent model (ECEM) is established for the consolidation of unsaturated soft foundations improved by PVD. Then, the associated analytical solutions of excess pore-air and pore-water pressures are derived under free strain and equal strain conditions, respectively. The rationality of proposed solutions is verified by comparing them with the existing solutions. Through conducting the parametric study, the effects of the permeability coefficients and the extent of influence zone on the dissipation of excess pore pressure and the consolidation settlement are investigated. Outcomes show that there is a plateau during the dissipation process of the excess pore-water pressure. The consolidation behavior is dominated by the dissipation of the excess pore-air pressure before the plateau, while it is governed only by the dissipation of the excess pore-water pressure after the plateau.

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“…Introducing the variables 𝜙 1 = ũa + 𝑞 12 ũw and 𝜙 2 = 𝑞 21 ũa + ũw into Equations ( 26) and (27), respectively, gives:…”

Section: A2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elliptical cylindrical equivalent model for consolidation of unsaturated soil improved by PVD

Tian

Jiang

et al. 2022

Num Anal Meth Geomechanics

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show abstract

“…The DEM model is simplified to simulate saturated assemblies. For more realistic simulation, Liu et al [38] utilized the unsaturated DEM technique. The temperature was introduced into DEM as an additional degree of freedom.…”

Section: Heat Transfer Formulation In Dem and Cfdmentioning

confidence: 99%

Evaluating the effective thermal conductivity of geothermal pavements constructed using demolition wastes by DEM and 3D printing techniques

et al. 2021

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This paper studies the effect of various parameters on the effective thermal conductivity (k eff ) of the geothermal pavement system when constructed using construction and demolition (C&D) materials. Recycled asphalt pavement (RAP) and recycled concrete aggregates (RCA) were utilized to experimentally model the geothermal pavement system, consisting of copper tubes to circulate water in the pavement and harness thermal energy. Numerical computational fluid dynamics (CFD) and discrete element method (DEM) methods were used to simulate the geothermal pavement system. Six samples of RAP and RCA aggregates with different particle size distributions were utilized to study the effect of important parameters in the geothermal pavement system. According to the results, coupled CFD-DEM approach could simulate the heat transfer mechanism in geothermal pavement compared to the results of the CFD simulation. The results indicated that increasing porosity would decrease k eff . The decrease rate depended on the gravel content of the sample where samples with a higher gravel content experienced a higher rate of decrease. Also, simulation results showed that increasing the gravel content could increase the value of k eff . Increasing the axial stress resulted in an increase in the value of coordination number (CN) and k eff . Moreover, comparing the thermal power and contact distributions indicated that the morphology of the heat conduction was the same as the contact network distribution. To study the effect of the particle shape on k eff , a novel approach was used that comprised of 3D scanning and printing real particle shape of RCA aggregates by thermochromic material. Simulated assemblies with DEM were verified using 3D printed particles. The effect of aspect ratio (AR) on k eff was studied which indicated that increasing AR would increase k eff . Decreasing AR to one, on the other hand, increased the time needed to reach the steady state.

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“…The established warning system can be used to predict future disasters, provide relevant design principles for infrastructure construction and reinforce and transform aging infrastructure in a timely manner. It will also provide scientific decision-making support for comprehensive natural hazards risk management and emergency plans for disaster prevention [14,[49][50][51][52][53]. For example, seasonal European early warning systems have been developed and have been running in a preoperational mode since mid-2018 under the EU-funded Enhancing Emergency Management and Response to Extreme Weather and Climate Events project [48].…”

Section: Establishment Of An Early Warning System For Flood-hazardsmentioning

confidence: 99%

Lesson Learned from Catastrophic Floods in Western Japan in 2018: Sustainable Perspective Analysis

Lin

Zhang

et al. 2020

Water

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Natural hazards have a significant impact on the sustainable development of human society. This paper reports on the catastrophic floods in western Japan in 2018. Continuous rainfall resulted in catastrophic floods, leading to 212 deaths, damage to more than 2000 houses and 619 geological disasters in 31 prefectures. The causes and contributing factors of these catastrophic floods are analyzed. The analysis of the causes of typical natural hazards provides an important lesson for hazard prevention and management. To adapt to climate change and prevent natural hazards in the future, the preliminary investigation and sustainable perspective analysis in this paper suggest the importance of the construction of a spongy city and the establishment of an early warning system with the help of information science and artificial intelligence technologies (ISAIT); we also highlight the urgent need to improve and strengthen the management of infrastructure.

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A micro-mechanical model for unsaturated soils based on DEM

Cited by 40 publications

References 84 publications

Elliptical cylindrical equivalent model for consolidation of unsaturated soil improved by PVD

Elliptical cylindrical equivalent model for consolidation of unsaturated soil improved by PVD

Evaluating the effective thermal conductivity of geothermal pavements constructed using demolition wastes by DEM and 3D printing techniques

Lesson Learned from Catastrophic Floods in Western Japan in 2018: Sustainable Perspective Analysis

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