A Method of Calibrating the Uniformity of Similar Materials Using Strain Bricks

Abstract

Provided is a method for standardizing uniformity degree of similar materials using strain bricks. The equipment used includes a plurality of groups of the strain bricks, a plane stress testbed and astrain monitoring system, and each group of the strain bricks are composed of a plurality of the strain bricks; the method for standardizing the uniformity degree of the similar materials includes thefollowing steps of step 1, laying in different layers; step 2, electrically connecting each strain brick with a strain monitoring system, and conducting zero clearing on the initial data of each strain brick; step 3, tamping the similar materials in each layer, and in the process of tamping of the similar materials needed to be laid with the strain bricks of each layer, monitoring micro strain epsilon on each strain brick of the similar materials of the corresponding layers in real time through the strain monitoring system, and when the micro strain epsilon on each strain brick is the same, obtaining a conclusion that the similar materials of the corresponding layers have the same uniformity degree; step 4, laying the similar materials in sequence according to the above three steps untilthe heights of similar materials are the same as the designed height of a similar material model. The method solves the problem of low uniformity of the similar materials in the process of manual tamping.

Description

technical field [0001] The invention relates to the field of simulation experiments of similar materials, in particular to a method for calibrating the uniformity of similar materials during the compaction process of laying similar materials on a plane stress test bench. Background technique [0002] Similar material simulation experiment is a research method that can be used to more realistically simulate the overlying rock structure and movement law, stope surrounding rock displacement and stress field changes in the process of coal seam mining. Compared with the field measurement, the similar material simulation experiment It is more convenient, the experiment takes less time, and the cost is low. It can conduct targeted research on a certain mechanism, and can also dynamically reflect the change process of overlying rock structure and surrounding rock stress during coal seam mining. The similar material simulation experiment is mainly to replace the physical and mechanic...

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Problems solved by technology

[0003] At present, the equipment used in China to simulate similar materials mainly includes plane stress test benches. Similar materials are evenly layered on the plane stress test bench. During the layered laying of similar materials, each layer of similar materials needs to be compacted. However, in the process of artificial compaction, it is impossible to guarantee that the degree of compaction of each layer of similar material bodies is the same, and the degree of compaction will seriously affect the physical and mechanical properties of the same similar material body, resulting in the density, porosity, mechanical properties and other parameters of similar materials in the same layer. Lack of uniformity seriously affects the reliability and fidelity of simulation tests on similar materials

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