Theoretical and Experimental Study on Multi-Scale Mechanical Properties of Soil

Dong, Feng; Fang, Yingguang

doi:10.1007/s11204-015-9327-7

Cited by 8 publications

(6 citation statements)

References 14 publications

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“…Therefore, the volume of the RVE is L 3 and the volume of the rock block is πd 3 /6. The side length L can be expressed as (Feng and Fang 2015c;:…”

Section: Mesoscopic Representative Volume Element (Rve) Of Soil-rock ...mentioning

confidence: 99%

“…Strain gradients occur when the microstructures of the material undergo plastic shape distortion. Therefore, the strain gradient theory is used to describe the plastic shape distortion inside the soil-rock cell in this study, and then the strain energy of the soil-rock cell can be expressed by the strain and the strain gradient (Fang 2014;Feng and Fang 2015c):…”

Section: Multi-scale Coupled Shear Strength Theoretical Model Of Soil...mentioning

confidence: 99%

“…Its physical meaning is the percentage of the number of rock blocks with equivalent diameter d in the total number of rock blocks in the unit volume of soil-rock mixture, which can be determined by the grading function g(d) of rock blocks. Therefore, f(d) can be expressed as (Feng and Fang 2015a;Feng and Fang, 2016):…”

Section: Eshelby-mori-tanaka Equivalent Inclusion Average Stress Prin...mentioning

confidence: 99%

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A multiscale finite element method for soil-rock mixture

Liu¹,

Dong

2023

Front. Mater.

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Soil-rock mixture is a complex multi-phase composite geotechnical material, and its strength is determined by the physical properties of constituent multi-phase materials and their coupling mechanical response between different phases of materials. Based on the Eshelby-Mori-Tanaka equivalent inclusion average stress principle, a theoretical model of multi-scale coupled shear strength of soil-rock mixture considering the interaction effect of rock block and soil is established, and the rotational freedom reflecting the microscopic motion details of rock block is introduced. Moreover, a multi-scale coupled constitutive relationship of soil-rock mixture is derived and compiled into a multi-scale finite element program. Based on the large-scale direct shear test of soil-rock mixture, the model parameters of the multi-scale finite element method are determined, and then the multi-scale finite element program is used to simulate and predict the cross-scale deformation process of the soil-rock mixture slope. The results show that the multi-scale finite element method can effectively describe the influence of the mechanism of the micro motion characteristics of the soil-rock mixture on the macro mechanical response, and can effectively overcome the pathological mesh-dependency of the classical finite element method; the rotation displacement of the rock block is mainly concentrated within the shear zone of the slope. The maximum rotational displacement of rock blocks inside the soil-rock mixture slope is 40.7°, and the rotational displacement of rock blocks outside the shear zone is about 0°. The physical mechanism of the cross scale evolution of the shear band of the soil-rock mixture slope is that: the rotation of the rock blocks weakens the strain transmission ability between the rock block and the matrix soil, thus forming the concentration and development of the plastic strain, and finally leading to the penetration of the shear bands of the slope and the overall sliding failure.

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“…Therefore, the volume of the RVE is L 3 and the volume of the rock block is πd 3 /6. The side length L can be expressed as (Feng and Fang 2015c;:…”

Section: Mesoscopic Representative Volume Element (Rve) Of Soil-rock ...mentioning

confidence: 99%

Section: Multi-scale Coupled Shear Strength Theoretical Model Of Soil...mentioning

confidence: 99%

Section: Eshelby-mori-tanaka Equivalent Inclusion Average Stress Prin...mentioning

confidence: 99%

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A multiscale finite element method for soil-rock mixture

Liu¹,

Dong

2023

Front. Mater.

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“…Both natural and remodeled expansive soils have extremely complex mineral compositions and random structures. The research scale ranges from nanosized minerals to macroscale clays, and there are complex interactions between particles, as well as between particles and electrolyte solution [4][5][6][7]. So far, the explanation of the swelling and shrinking mechanism of expansive soil has not been unified.…”

Section: Introductionmentioning

confidence: 99%

A Simulation Study on the Swelling and Shrinking Behaviors of Nanosized Montmorillonite Based on Monte Carlo and Molecular Dynamics

et al. 2021

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Montmorillonite is the main mineral source for the swelling and shrinking of expansive soils. The macroscopic phenomena of soil are affected by the action of deep-level nanosized minerals. In order to illustrate the nanoscale mechanism from the molecular level, a combination of Monte Carlo and molecular dynamics was used to explore the swelling and shrinking characteristics of montmorillonite. The results showed that the basal spacing, free swelling ratio, and void ratio were positively correlated with water content but were inversely proportional to the change of CEC. The hysteresis phenomena of swelling and shrinking were the most significant at a water content of 40%. Compared with the expansive soil, the nanoscale shrinkage curve of montmorillonite also included three stages of normal shrinkage, residual shrinkage, and no shrinkage. The relative concentration of water molecules conveyed information such as the thickness and position of the hydration film and explained the difference in swelling and shrinking caused by the above variables. The changes in the number and length of hydrogen bonds revealed the order of formation and the process of destruction of hydrogen bonds during the reaction. The similarity of the trends between the basal spacing, binding energy, and the number of hydrogen bonds indicated that the swelling and shrinking of the crystal layer are a reflection of the molecular interaction, and the hydrogen bonding is particularly critical.

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“…In recent years, there were little researches on soil fragmentation rate in the world, but it was very common to take soil fragmentation rate as the detection index [4][5][6][7][8][9] . Bayat H et al [10] established relationship between penetration resistance, bulk density and water content by collecting Iranian soil samples based on the feedforward neural networks, and believed that it is more convenient to estimate soil conditions by measuring penetration resistance and moisture content than by measuring other parameters.…”

Section: Introduction mentioning

confidence: 99%

Design and test of automatic detection platform for soil fragmentation rate in rotary tillage

Yang

Pang

et al. 2020

International Journal of Agricultural and Biological Engineering

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As an important index of soil crushing performance of rotary tiller, the soil fragmentation rate is still limited to manual measurement. In this study, an automatic detection platform for soil fragmentation rate was designed, which integrated soil intake, screening, weighing and calculation of soil fragmentation rate. This platform can solve the problem that the index of the soil fragmentation rate cannot be detected quickly and effectively after rotary tillage, which leads to difficulty in field quality evaluation. The platform was mainly composed of a shovel soil module, conveying module, screening module, weighing module and automatic control system, which could realize single-line and multi-point automatic soil fragmentation rate detection. Based on the homogeneous dry slope model, the tilting angles of soil intake and soil feeding after rotary tillage on the platform were determined to be 30.10° and 26.67°, respectively. According to the principle of flow conservation, a rotary circulation screening module was designed to obtain soil particle size grading. A method based on the principle of multi-line and multi-point measurement was developed to detect soil fragmentation rate. The influence of screening speed on screening effect was analyzed, and the reasonable value of screening speed was determined to be 0.5 m/s. A field performance test was carried out in October 2019 to verify the detection performance of the platform. The results showed that, compared with the manual test method, the maximum test error was no more than 11%, the minimum test error was less than 4%, the maximum single test time was no more than 2 min, and the total test time of each test area was no more than 30 min. The efficiency of single-point detection was significantly better than the manual detection, which indicated that the design in this study met the requirements of rapid detection of soil fragmentation rate, and provided a new idea for the automatic detection of quality of rotary tillage.

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Theoretical and Experimental Study on Multi-Scale Mechanical Properties of Soil

Cited by 8 publications

References 14 publications

A multiscale finite element method for soil-rock mixture

A multiscale finite element method for soil-rock mixture

A Simulation Study on the Swelling and Shrinking Behaviors of Nanosized Montmorillonite Based on Monte Carlo and Molecular Dynamics

Design and test of automatic detection platform for soil fragmentation rate in rotary tillage

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