A fluid-solid coupling photoelastic experimental device for particulate matter and method of using the same

Abstract

The invention relates to a particulate matter fluid-solid coupling photoelastic experiment device and a using method thereof, and belongs to the technical field of photoelastic experiments. The deviceis mainly composed of a bearing frame, a sealed container, a loading system, a water pressure supply system and a light source system. The device is applied to research on force chain structure evolution and action of the discrete particles in a specific water pressure environment, and the force chain evolution condition in a discrete particle system under the fluid-solid coupling condition can be observed very conveniently. In combination with extraction and analysis of digital images in the later period, spatial physical parameters such as displacement and rotation and mechanical parameterssuch as inter-particle contact normal and tangential force are calculated from the particle scale, and force chain strength distribution and configuration composition are obtained on the mesoscopic scale. within combination with a stress-strain relationship directly obtained by an experiment, multi-scale mechanical behavior research on the loose geologic body can be carried out deeply, a disaster-causing mechanism of the water environment on the loose geologic body is revealed, and an experiment basis is provided for constructing an engineering geologic safety control theoretical system in China.

Description

technical field [0001] The invention belongs to the technical field of fluid-solid coupling photoelasticity experiments, in particular to a granular material fluid-solid coupling photoelasticity experimental device. Background technique [0002] With the rapid development of my country's modernization and major infrastructure construction such as the "Belt and Road Initiative", landslides, landslides, debris flows and other major engineering geological disasters caused directly or indirectly also occur frequently. Such geological disasters have a common feature: the disaster-affected bodies are all loose geological bodies, and the inducing factors are mostly rainfall or artificial disturbance. Therefore, in-depth research on the multi-scale mechanical behavior and disaster-causing mechanism of loose geological bodies has become the focus and focus of my country's construction of engineering geological safety control theory system. [0003] Traditional geomechanics research ...

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Problems solved by technology

[0003] Traditional geomechanics research is mostly based on the theory of continuum mechanics, such as landslide limit equilibrium analysis method and finite element strength reduction method based on continuum. The relationship between structure and macro-mechanical behavior

In order to overcome the limitations of macroscopic phenomenological models, many scholars have used the discrete element method to study the macroscopic mechanical behavior of discontinuous media. However, it is still necessary to establish a basic theory for the study of mesomechanics of loose geological bodies in order to accurately describe and explain it. Intrinsic physical and mechanical mechanism

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