Dynamic compaction reinforcement foundation simulating method based on three-dimensional continuous-discrete unit coupling

Abstract

A dynamic compaction reinforcement foundation simulating method based on three-dimensional continuous-discrete unit coupling mainly includes the following steps of a, establishing a lumpy material particle three-axis test model through a back analysis method, and correcting particle mesomechanics parameters; b, simulating a lumpy material dynamic compaction test to verify the mesomechanics parameters; c, establishing a dynamic compaction reinforcement foundation continuum model with a foundation and a compaction hammer; d, generating a discrete domain interface (wall) through a continuous domain surface (face) according to a continuous-discrete coupling method; e, generating a discrete domain particle model to complete dynamic compaction reinforcement foundation simulating discrete-continuous coupling. On the basis of the continuous-discrete coupling method and the dynamics analysis, the method can adapt to the quantitative analysis of the interaction between compaction hammers with different shapes and foundation soil power of different types.

Description

technical field [0001] The invention relates to the field of rock and soil mechanics research, in particular to a theoretical and practical three-dimensional simulation method for the treatment of unfavorable sites such as soft soil foundations and coal gangue foundations. Background technique [0002] At present, scholars at home and abroad have studied the reinforcement mechanism of dynamic compaction of different types of foundation soils, such as loess, soft soil, sandy soil or gravel soil, by means of laboratory tests and field tests. According to the continuous classification of media, research methods can be divided into research based on continuum mechanics and research based on discrete media mechanics. According to the physical essence, discrete media is applicable to the principles and methods of discrete medium mechanics; rammers and large-scale foundation soils are applicable to the principles and methods of continuum mechanics. Therefore, the dynamic compactio...

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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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