2D simulation experiment method for flowing state of soil particles in vibrating compaction process

Abstract

The invention discloses a 2D simulation experiment method for the flowing state of soil particles in the vibrating compaction process. The 2D simulation experiment method comprises the steps of: preparing a wooden box with a transparent front wall and detachably adjustable left and right walls; preparing a group of aluminum rods with different diameters; marking different colors on the end surfaces of the aluminum rods according to the different diameters; mixing the aluminum rods according to a certain proportion; wrapping the surfaces of the aluminum rods by using gauze and fine sand to simulate an internal friction angle; simulating cohesive force by using butter or slow-drying weak-viscosity glue; manufacturing a small loading device; paving the aluminum rods in a paper box; measuring and calculating the porosity before the experiment; starting a compaction experiment; measuring and calculating the porosity after the compaction; comparing the front and rear porosities; determining the compaction effect; observing a picture obtained by a high-speed camera; and analyzing a microscopic motion mechanism. The method can conveniently and detailedly simulate the flowing state of the soil particles in the vibrating compaction process, provides convenience for explaining the vibrating compaction mechanism from a microscopic angle, and provides a visual and effective experimental means for researching the relation between microscopic motion and macroscopic parameters in the vibrating compaction process.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for performing 2D experimental simulation on the flow of soil particles in a vibratory compaction process with aluminum rods. Background technique [0002] In recent years, due to the heavy road traffic volume and the gradual increase of vehicle load, coupled with the continuous increase in road operation time, roads are prone to damage phenomena such as subsidence, potholes, water damage, cracking and rutting during operation. In order to adapt to the new traffic environment, prolong the service life of the highway and improve the service quality, scholars put forward higher requirements for the compaction quality of the subgrade and pavement. Good compaction quality can effectively improve the strength and stiffness of soil foundation filling and pavement materials, and significantly improve the impermeability and overall stability of the compacted...

AI Technical Summary

Problems solved by technology

First of all, at the macro level, the soil is mainly simplified as an elastic-damping element to establish a dynamic model of the "roller-soil" system with different degrees of freedom, and the dynamic response characteristics of the system are analyzed by means of numerical simulation analysis; or through limited The method of meta-analysis assumes that the soil is a continuous and uniform elastic or elastic-plastic structure, and analyzes the mechanical response by simulating the construction load; the construction scene can also be simulated by the method of outdoor experimental road or indoor scale experiment, but these experimental methods The work volume is too large and the cost is too high. Even for indoor scale experiments, in order to ensure the influence range and certain movement distance of the small roller, the requirements for the experimental consumables and the volume of the experimental tank are very high, and most of these experiments can only As far as the macroscopic parameters such as soil displacement and vibration acceleration are concerned, the microcosmic mechanisms such as the flow state of soil particles, compaction, and filling cannot be displayed during the vibration compaction process.

In terms of microcosm, most of the previous studies focused on discrete element simulation analysis, but there has been a lack of effective microcosmic experiments combined with it to truly reveal the process of particle movement, filling and void decay in the soil compaction link, thereby Realize the interpretation of macroscopic dynamic response from the perspective of microscopic motion

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