A particle flow numerical simulation method for reflecting the distribution of the real engineering soil-rock mixture

Abstract

The invention discloses a particle flow numerical simulation method for reflecting the distribution of the real engineering soil-rock mixture. The method comprises the following steps: taking photos to obtain the real image of the soil-rock mixture on the project site; using the processing technology to recognize rocks and extract their boundary coordinates; combined with particle sieving and image data, obtaiing the particle size distribution of soil-rock mixture; testing the strength and deformation of soil and rock and deformation parameters.; establishing a numerical model of particle flowin soil-rock mixture; calibrating parameters of particle flow numerical model and carrying numerical tests of mechanical properties of soil-rock mixture specimens. The method is convenient to implement and can be programmed to model intelligently, and can overcome the limitation of test size and meet the requirement of engineering. It is suitable for DEM simulation of binary media such as earth-rock mixture and concrete.

Description

technical field [0001] The invention relates to the field of geotechnical engineering and geological engineering, in particular to a particle flow numerical simulation method reflecting the distribution of real engineering soil-rock mixture. Background technique [0002] Soil-rock mixture is one of the main types of Quaternary sediments on the surface, especially widely distributed in the mountainous areas of western my country, such as common residual deposits, slope deposits and diluvial deposits. In addition, filling works in southwest mountainous areas are very common, such as roads, railway subgrades and airports, etc. The filling materials for filling works are mostly soil-rock mixtures. Because the physical and mechanical properties of rock and soil are very different, and the shapes and sizes of stones in natural soil-rock mixtures are various, and the spatial distribution is also very messy, it is difficult to describe the structural characteristics of soil-rock mix...

AI Technical Summary

Problems solved by technology

Nowadays, field tests are often used in engineering circles to test the mechanical properties of soil-rock mixtures. However, there are two obvious deficiencies in field tests: 1) The specimens are highly disturbing.

The preparation of field test specimens is often achieved by excavation and cutting. When the soil sample contains many irregular stones, potholes are prone to appear during the preparation of the specimen, and it is difficult to form a flat loading surface.

2) The cost is high, the working hours are long, the progress of the project is affected, and the test results are scattered

Due to the long hours of on-site test specimens and test preparation and the need for a large amount of equipment and manpower, the cost of on-site testing is high, and the site is occupied and the progress of the project is affected

Therefore, the number of field test samples is generally small, and the test results of the mechanical properties of the soil-rock mixture are often highly discrete.

However, the indoor test is limited by the maximum particle size of the materials used, and it is necessary to carry out necessary scale-down processing on the soil and stone materials exceeding the maximum allowable particle size of the test. Due to the effect of scale-down, there is a certain difference between the indoor test results and the real properties.

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