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Discrete element numerical simulation method for viscous sandy soil hydraulic erosion damage

A hydraulic erosion and numerical simulation technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve the problems of difficult control of variables, easy to generate errors, and long experiment cycle, so as to improve calculation efficiency, The effect of reducing the amount of calculation and simplifying the thinking

Active Publication Date: 2020-09-25
HEBEI UNIV OF TECH
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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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  • Discrete element numerical simulation method for viscous sandy soil hydraulic erosion damage
  • Discrete element numerical simulation method for viscous sandy soil hydraulic erosion damage
  • Discrete element numerical simulation method for viscous sandy soil hydraulic erosion damage

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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 viscous sandy soil hydraulic erosion damage. The method comprises the steps of:establishing an initial calculation space areaand a viscous sandy soil numerical model; initializing a numerical model and balancing stress; compiling a strength degradation criterion linear bonding contact model based on a time effect to simulate a clay phase between aggregate particles in the viscous sandy soil; selecting a contact model as a mesomechanics model of contact between aggregate particles, and valuing mesoscopic parameters of the contact model; calibrating the numerical model through a direct shear strength test; establishing a flow field to simulate the hydraulic erosion damage process of the viscous sandy soil; and obtaining a numerical simulation result of the hydraulic erosion damage test. According to the method, the viscous sand hydraulic erosion damage is simulated through the discrete elements, the thought is simplified, the viscous sand hydraulic erosion damage process can be truly simulated on the mesoscopic level under the conditions that the calculated amount is reduced as much as possible and the calculation efficiency is improved, the migration situation of soil particles is observed and recorded, and the result is 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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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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