A 2D Simulation Experimental Method of Soil Particle Flow During Vibratory Compaction

Abstract

The invention discloses a 2D simulation experiment method for the flow state of soil particles in the vibration compaction process. A wooden box with a transparent front wall and detachable and adjustable left and right walls is prepared, and a group of aluminum rods with different diameters are prepared. Mark different colors on the surface, mix them in a certain proportion, use gauze and fine sand to wrap the surface of the aluminum rod to simulate the internal friction angle, and use butter or slow-drying weak-viscosity glue to simulate the cohesion, make a small loading device, and spread the aluminum rod in the carton OK, measure and calculate the porosity before the experiment, start the compaction experiment, measure and calculate the porosity after compaction, compare the before and after porosity to determine the compaction effect, observe the photos obtained by the high-speed camera, and analyze the microscopic movement mechanism. The invention can conveniently and detailedly simulate the flow state of soil particles in the process of vibratory compaction, provide convenience for explaining the mechanism of vibratory compaction from a microscopic point of view, and provide an intuitive and effective method for studying the relationship between microscopic motion and macroscopic parameters in the process of vibratory compaction experimental means.

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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