Method for building fluid-structure interaction test based on post-peak rock stress and permeability characteristic

Abstract

The invention provides a method for building a fluid-structure interaction test based on a post-peak rock stress and a permeability characteristic. The method belongs to the technical field of coal mining, and comprises the steps of determining a permeability characteristic value of the post-peak rock stress; converting a permeability characteristic value of a sample prototype test into a permeability coefficient; converting the permeability coefficient into a model similarity permeability coefficient; adopting flexible pipes as model test materials, and determining the flexible pipe length and the flexible pipe quantity required for a model; enabling flexible pipe permeability coefficients under different loading values to correspond to the corresponding model similarity permeability coefficients; determining the flexible pipe diameter according to a target loading value; determining a force value at each rock stratum buried depth position of the model test; determining a fluid-structure interaction test model according to relations between the target loading values and the force values; carrying out the fluid-structure interaction test according to the fluid-structure interactionmodel. The fluid-structure interaction test simultaneously meets the requirements on a mechanical property and the material permeability characteristic, realizes the research of an interaction modeltest of a seepage field and a gravity field, and meets the requirement of actual production.

Description

technical field [0001] The invention belongs to the field of coal mining, and more specifically relates to a method for establishing a fluid-solid coupling test based on post-peak rock stress and permeability characteristics. Background technique [0002] In recent years, due to the rapid development of China's economy, the development of the civil engineering industry has been promoted, especially the rapid construction of surface and underground structures and the mining of various mineral resources have become new hot spots in the industry. For traffic tunnels, there are shallow buried mountain tunnels in the past to deep buried traffic tunnels and subsea tunnels now, urban overground roads in the past to underground transportation lines now, shallow coal seam mining in the past to deep rock formations now Coal mining, as well as deep resource mining, radioactive waste geological deep burial and other projects. With the transfer of engineering construction to the deep, t...

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Problems solved by technology

At present, the experimental research on coal mine problems mainly uses model tests for research and analysis. There are relatively few studies on fluid-solid coupling model test devices, and it is relatively difficult to implement. This aspect is mainly affected by similar model test materials. As far as the solid coupling model is concerned, the control of the water permeability characteristics and the control of the mechanical properties of similar materials are relatively contradictory and conflicting. The experimental research is carried out through similar model tests. Since the similar materials used in the model tests lose their mechanical properties after contact with water, most In this type of model test, the influence of water factors cannot be applied. When the permeability characteristics of similar materials are met, its mechanical properties cannot meet the requirements of the original test; when the mechanical properties test is met, its permeability characteristics cannot meet the test requirements. The experimental research mainly considers the influence factors of a single gravity field. There are few researches on the coupling model test of the seepage field and the gravity field, which is difficult to meet the requirements of actual production, which leads to the gap between the model test and the field test at this stage. The conclusions drawn from the test Does not conform to objective laws

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