A Simple Model for Elastic‐Plastic Contact of Granular Geomaterials

Wang, Jian; Li, Qimin; Yang, Changwei; Huang, Yidan; Zhou, Caizhi

doi:10.1155/2018/6783791

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…The diaphragm wall was modeled by plate elements. The anchor reinforcement is simulated by elastic element, the free part is simulated by point-to-point anchor reinforcement, and the anchorage part is simulated by elastic geogrid (Ninic, Stascheit, & Meschke, 2014;Zhang, Chen, & Liu, 2016;Wang, Li, Yang, Huang, & Zhou, 2018;. In order to simulate the interaction between retaining structure and soil more effectively and reasonably, the cohesion and internal friction angle of silty clay are reduced by the interfacial strength reduction factor Rinter.…”

Section: Monitoring Principlementioning

confidence: 99%

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

Cui

Wang

2019

Journal of Civil Engineering and Management

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The reliable retaining methods and a good stress system are the key to the success of super large and deep excavation engineering. In this paper, the deepest foundation pit in Hainan province is taken as an example. The method of mutual verification between in-situ monitoring and numerical simulation is adopted. The mechanical performance of composite retaining structure composed of reinforced concrete cast-in-situ soldier pile wall, diaphragm wall and prestressed anchor cable are studied. The interaction between the reinforced concrete cast-in-situ pile retaining structure at the upper part and the diaphragm wall retaining structure at the lower part is revealed, and the variation of internal forces of the diaphragm wall retaining structure in the time and space is demonstrated. And then the influence of insertion ratio and rigidity on the mechanical properties of diaphragm wall is discussed. Research shows, the range of interaction between the upper and lower retaining structures is limited. During the excavation process, the maximum bending moment of the diaphragm wall is always near the excavation surface, and the curvature of the bending moment curve decreases gradually with the increase of excavation depth and axial tension of anchor. When the insertion ratio of diaphragm wall increases, the maximum bending moment moves upward. With the rigidity of the diaphragm wall increases moderately, the bending moment of the retaining structure increases, but the lateral displacement decreases. The research results can provide theoretical basis and practical experience for the composite retaining structure design of super large and deep foundation excavations.

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Section: Monitoring Principlementioning

confidence: 99%

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

Cui

Wang

2019

Journal of Civil Engineering and Management

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“…18 More realistic contact model for granular geomaterials can also be used. 19,20 The corresponding granular parameters are gained by back analysis of granular triaxial tests, see Table 6.…”

Section: Numerical Simulationmentioning

confidence: 99%

Dynamic response and damage character of road embankment under strong earthquake

Wang

Yang

et al. 2018

International Journal of Distributed Sensor Networks

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Dynamic response of road embankment under strong earthquake was explored by site investigation, shaking table tests, and discrete element method simulations, which shows that the distribution of responded accelerations strongly depends on the amplitude of input ground motion and the height of road embankment. When the peak ground acceleration of ground motion is small, peak ground acceleration amplification factors will linearly increase from the toe to the top of the slope; then, it will step into non-linear amplification; when the peak ground acceleration of ground motion is large enough, it will transform from amplification to attenuation. There is a logarithmic relationship between the magnitude of acceleration and the slope amplification factor, and the critical acceleration making the peak ground acceleration transform from amplification to attenuation increases with the raise of embankment height and connects with spectral characteristics of ground motion. There is a logarithmic relationship between the input ground acceleration and the amplification ratio of slope top to toe, and the critical acceleration making the peak ground acceleration transform from amplification to attenuation increases with the raise of embankment height and connects with spectral characteristics of ground motion. The results found should be useful for aseismic of road embankment as well as railway subgrade.

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“…DEM can reflect the behavior and deformation of soil from the physical properties, but it is difficult to simulate large-scale site response problems, and the dynamic boundary condition of the granular model is also difficult to set. Wang et al [13,14] proposed contact models for the soil particle interactions that can be used for DEM simulation.…”

Section: Introductionmentioning

confidence: 99%

3D continuum-discrete coupling modeling of soil-hammer interaction under dynamic compaction

Wang¹,

Jiang²,

Ouyang³

et al. 2019

J. vibroeng.

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To investigate the compaction effect and environmental impact effect of dynamic compaction (DC), a 3D continuous-discrete coupling method was used to simulate the hammer-soil interaction process for the first time. Through the dynamic response analysis of the hammer, it is found that the force of the hammer changes through three stages: the contact force increases rapidly, the contact force decreases rapidly, and the contact force decreases slowly; in addition, the soil particles are compacted under the dynamic load, resulting in oscillating changes in the soil porosity. The granular soil is punched by the hammer to form a truncated punching surface in the bulk below the bottom of the hammer. Ellipsoidal compaction bands are formed inside the punching surface, and shear bands are formed outside the punching surface. The compression and shear zones affect the soil outside the continuous-discrete interface and form a stress concentration zone and a plastic strain zone near the interface, resulting in a sharp attenuation of the acceleration amplitude as the radial distance increases. Through an amplitude and Fourier spectrum analysis, it is found that the radial vibration caused by the DC is the strongest, while the tangential and vertical vibrations are almost the same. With the increase in the radial distance, the radial vibration attenuation rate is greater than that of the tangential and vertical vibrations, and their PGAs tend to be the same away from the impact point. These research results are helpful for evaluating the influence of the DC and the installation process on the reinforcement effect of the soft ground and for improving the accurate design and control level of soft ground strengthened by DC.

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A Simple Model for Elastic‐Plastic Contact of Granular Geomaterials

Cited by 5 publications

References 20 publications

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

Mechanical Performance of Composite Retaining and Protection Structure for Super Large and Deep Foundation Excavations

Dynamic response and damage character of road embankment under strong earthquake

3D continuum-discrete coupling modeling of soil-hammer interaction under dynamic compaction

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