A Discrete Element Numerical Simulation Method for Hydraulic Erosion Damage of Cohesive Sand

A technology of hydraulic erosion and numerical simulation, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc. The effect of reducing the amount of calculation and accurate results

Active Publication Date: 2021-04-06
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although seepage erosion experimental research can provide a large amount of valuable research data, it requires a lot of manpower and material resources, the experimental period is often quite long, and the research efficiency is low. At the same time, the variables are not easy to control, and errors are easily generated. Often limited, it needs to be processed to obtain relevant parameters that can be used to analyze seepage erosion damage

Method used

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  • A Discrete Element Numerical Simulation Method for Hydraulic Erosion Damage of Cohesive Sand
  • A Discrete Element Numerical Simulation Method for Hydraulic Erosion Damage of Cohesive Sand
  • A Discrete Element Numerical Simulation Method for Hydraulic Erosion Damage of Cohesive Sand

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Embodiment 1

[0065] This embodiment takes the hole erosion test as an example, and the size of the hole erosion test sample is 112mm × 224mmm × 112mm (such as Figure 4 As shown), there is a hole with a diameter of 20mm in the middle.

[0066] In step 1, follow the Figure 5 The aggregate phase grading curves shown generate the respective cohesive sand numerical models, as Figure 6 The three cohesive sand numerical models generated from gradation curves with fractal dimensions D=1.7, 2.0 and 2.5 are shown from left to right;

[0067] In step 4, the mesoscopic parameters include strength degradation criterion based on time effect, linear bond stiffness ratio, linear bond modulus, linear bond normal strength, linear bond cohesion, etc. The specific parameters are: the aggregate particle density is 2500kg / m 3 , the aggregate particle contact modulus E c =1.0×10 7 Pa, linear bond modulus E b =1.0×10 7 Pa, linear bond stiffness ratio k n / k s = 1.0, clay phase ratio ζ = 0.3, bonding r...

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Abstract

The invention discloses a discrete element numerical simulation method for hydraulic erosion damage of cohesive sandy soil, which includes establishing an initial calculation space area and a numerical model of cohesive sandy soil; initializing the numerical model and stress balance; and compiling a strength degradation criterion based on time effect linear viscose The joint contact model is used to simulate the clay phase between aggregate particles in cohesive sand; the contact model is selected as the mesoscopic mechanical model of the contact between aggregate particles, and then the value of the mesoscopic parameters of the contact model is determined; through direct The numerical model is calibrated by the shear strength test; the flow field is established to simulate the hydraulic erosion damage process of cohesive sand; the numerical simulation results of the hydraulic erosion damage test are obtained. The present invention uses discrete elements to simulate the hydraulic erosion damage of cohesive sand, which simplifies the train of thought, and can simulate the hydraulic erosion damage process of cohesive sand more realistically at the mesoscopic level under the condition of reducing the amount of calculation as much as possible and improving the calculation efficiency. Record the migration of soil particles, the results are accurate.

Description

technical field [0001] The invention relates to the field of numerical simulation of hydro-erosion damage of geotechnical engineering soil, in particular to a discrete element numerical simulation method of hydro-erosion damage of cohesive sandy soil. Background technique [0002] Human beings have lived in water since ancient times, and rivers have also bred human civilization. However, while human beings benefit from rivers, they are also troubled by the disasters they bring. In order to resist the invasion of river floods, human beings build embankment projects along rivers and rivers to restrict their flow paths within a set range. However, while these embankments and dams benefit mankind, their potential seepage and damage problems have huge potential safety hazards. In addition, my country is also an area deeply affected by geological disasters such as landslides, and the biggest impact on landslides is rainfall and reservoir water. Therefore, it is of great signific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F111/10G06F119/14
CPCG06F30/20G06F2111/10G06F2119/14
Inventor 黄达黄文波裴向军宋宜祥岑夺丰
Owner HEBEI UNIV OF TECH
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