A simulation method for dynamic consolidation of foundations based on continuous-discrete element coupling

Abstract

A dynamic tamping reinforcement simulation method based on the coupling of three-dimensional continuous-discrete elements mainly includes the following steps: (a) using the back analysis method to establish a triaxial test model for granular particles, and correct the microscopic mechanical parameters of the particles; (b) ) Simulate the dynamic compaction test of bulk to verify the mesomechanical parameters; (c) establish a continuum model of the foundation reinforced by dynamic compaction, including two parts of the foundation and the rammer; (d) according to the continuous-discrete coupling method, use the continuous domain The surface (face) generates a discrete domain interface (wall); (e) generates a discrete domain particle model to complete the dynamic compaction reinforcement simulation discrete-continuous coupling. The invention is based on the continuous-discrete coupling method and dynamic analysis, and is applicable to the quantitative analysis of the dynamic interaction between different shapes of rammers and different types of foundation soil.

Description

Technical field [0001] The present invention relates to the field of rock and soil mechanics, and in particular, the theory and practice of a defective site treatment such as soft soil foundation, coal gangue foundation, and a three-dimensional simulation method. Background technique [0002] At present, domestic and foreign scholars use indoor trials and on-site testing methods to study different types of ground soil, such as loess, soft soil, sand or gravel land base strength reinforcement mechanism. According to the continuity classification of the medium, the research method can be divided into studies based on continuous medium mechanics and based on discrete medium quality. Depending on the physical nature, the discrete medium is suitable for the principles and methods of discrete medium mechanics; the hammer and a wide range of ground bases are suitable for the principles and methods of continuous medium mechanics. Therefore, the solution of the base of the dispersion is s...

AI Technical Summary

Problems solved by technology

The method based on the continuum theory cannot quantitatively analyze the kinematics and dynamics characteristics of the rock-soil bulk medium during the tamping process; the simulation method based on the discrete medium theory can better reflect the material properties of the bulk particles, but cannot accurately describe the complex shape Stress Characteristics and Inertial Effect of Rammer

Due to the limitations of research methods, the current understanding of soil tamping mechanism is still in the stage of qualitative description and hypothesis, and the understanding of the interaction between rammer and bulk (especially concave bottom rammer - bulk) is basically blank.

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