Numerical simulation algorithm for engineering properties of coarse-grained soil by using DDA (Discontinuous Deformation Analysis)

A technology of engineering properties and numerical simulation, applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems that the engineering characteristics of coarse-grained soil cannot be fully reflected, and the design is conservative, and achieve stable contact and simulation. Process-reliable, random-shaped effects

Inactive Publication Date: 2012-06-27
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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Problems solved by technology

However, the stability analysis index adopted in the engineering design still replaces the internal friction angle with the natural...

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  • Numerical simulation algorithm for engineering properties of coarse-grained soil by using DDA (Discontinuous Deformation Analysis)
  • Numerical simulation algorithm for engineering properties of coarse-grained soil by using DDA (Discontinuous Deformation Analysis)
  • Numerical simulation algorithm for engineering properties of coarse-grained soil by using DDA (Discontinuous Deformation Analysis)

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Embodiment Construction

[0028] According to Figure 1a, b, Figure 2a-d and image 3 As shown, the present invention utilizes DDA to the numerical simulation algorithm of coarse-grained soil engineering properties, according to the characteristics of coarse-grained soil particles, designs random generation algorithm, randomly generates convex polygon block, the concavity and convexity of the block, and the size of the particle size is all adjustable. Its main control indicators include: unevenness, roundness, particle size, etc. of the block. Use DDA to prepare the sample, strictly ensure that the blocks do not intersect, and the contact is stable, that is, the block and other blocks around it are required to be in contact with each other, but any corner of the block must meet the requirements not to embed other blocks Only in this way can the coarse-grained soil simulation be close to the actual indoor test.

[0029] Referring to the test data obtained by sampling the coarse-grained soil in a certain ...

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Abstract

The invention relates to a numerical simulation algorithm for the engineering properties of coarse-grained soil by using DDA (Discontinuous Deformation Analysis). The numerical simulation algorithm comprises the following steps of: randomly generating polygons, carrying out grain release according to intrusion judgment, generating polygonal grains meeting the requirements on a certain graduation in predetermined release areas according the laboratory test requirements of the coarse-grained soil, generating a loosely-distributed granular system, and generating an actually-close stacked body through stacking simulation, wherein the positions of the grains are random, the number of sides and the length of side are also random, and the grains are not intersected with one another; and by referring to the laboratory triaxial test, adding a flexible material to two sides of a test sample and dispersing the test sample into a block body, adding rigid plates to the top and the bottom of the test sample, rigid blocks are placed at two sides of a top loading plate in order to ensure the vertical action of an axial pressure, and applying the DDA to carry out numerical simulation on the mechanical test of the coarse-grained soil after respectively applying test loads, i.e. a confining pressure sigma3 and an axial pressure sigma1, to the two sides and the top of the test sample.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a numerical simulation algorithm for engineering properties of coarse-grained soil by computer numerical simulation. Background technique [0002] Coarse-grained soils are widely distributed and abundant in nature. Because of its engineering characteristics such as good compaction performance, strong water permeability, high filling density, high shear strength, small settlement deformation, and high bearing capacity, it has been widely used in engineering construction. For example, it is used to build earth-rock dams, railway subgrades, bridge piers and gravel cushions for weak foundations. In addition, many earth-rock dam projects are filled with sand, gravel, and rockfill. However, the stability analysis index adopted in the engineering design still replaces the internal friction angle with the natural angle of repose, and the engineering characteristics of t...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 郭培玺
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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