CBR numerical test method for soil-stone filled subgrade soil

A numerical test and subgrade soil technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of large deviation of CBR value, complicated test conditions, and long time consumption, and achieve the goal of saving test cost and time cost Effect

Inactive Publication Date: 2017-11-24
CHANGAN UNIV
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  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for simulation of tests on indoor or concrete samples that are tested under different conditions such as loadings from traffic over them (CBS), moisture content at specific locations within it's structure, etc., while also saving money compared to traditional methods like laboratory experiments.

Problems solved by technology

This patented technical problem addressed in this patents relates to studying the characteristics of various types of rocky substances used in road constructions such as sandstone or concrete mixes that require filling them before being put into use. Experimental research has shown how varying levels of specific particles can affect their behavior when placed together under loadings (CBR) without causing any issues like cracks overtime. However, current methods involve testing each sample separately, which takes too much time and requires multiple samples.

Method used

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  • CBR numerical test method for soil-stone filled subgrade soil
  • CBR numerical test method for soil-stone filled subgrade soil
  • CBR numerical test method for soil-stone filled subgrade soil

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Embodiment

[0037] The present embodiment is carried out according to the following steps:

[0038] (1) According to the requirements of the specification, the earth-rock mixed subgrade soil is screened to obtain the particle size grouping, and the PFC 2DDefine the boundary according to the size requirements of the standard test mold, group the particles, set the initial void ratio and set it within a suitable range, such as 0.04, set the lower limit of the particle size of each group and the upper and lower limits of the particle size of each group According to the actual conversion, the area ratio of each group of particles is defined. Since the particles smaller than 1 mm will cause the system to collapse due to the excessive number of particles in the simulation software, or the number of generated particles will escape the boundary wall and cannot be controlled, so this embodiment does not consider the generation of particles below 1 mm;

[0039] (2) Command the area domain where th...

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Abstract

The invention belongs to the field of computer tests and particularly relates to a CBR numerical test method for soil-stone filled subgrade soil. Simulation is performed through discrete element software PFC2D. The method comprises the steps that first, particles are grouped, the grouping range of each group of particles is determined, and an initial void ratio is preset; second, a domain and a boundary wall are defined, and traversing conditions are set; third, a soil-stone filled particle two-dimensional discrete element constitutive model and relevant parameters are selected; fourth, particle balls are generated, external conditions are applied, and a two-dimensional discrete element test piece of a soil-stone filled body is obtained through calculation and analysis; and last, loading conditions are applied, a California bearing ratio (CBR) test is simulated in PFC2D, test data is recorded, and a CBR value is calculated. The method is an efficient and accurate computer numerical simulation method, and the process of loading the CBR test value to the soil-stone mixture molding test piece is simulated to deeply study mechanical properties of the soil-stone filled subgrade soil.

Description

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Claims

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Application Information

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Owner CHANGAN UNIV
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