Experimental device and method for simulating mining non-uniform loading

Abstract

The invention discloses an experimental device and method for simulating mining non-uniform loading, belongs to the technical field of rock mechanics experiments, and aims to solve the technical problem that rock mass bears non-uniform load damage due to roof rotation caused by simulation of underground excavation. The experimental device comprises a loading system, a control system, a monitoring system and a servo hydraulic system; according to the loading system, an initial uniformly distributed vertical load is applied through a first-stage uniformly distributed load loading device; and a second-stage non-uniformly distributed loading device realizes differential loading through two independent loading oil cylinders, so that a second-stage bearing plate rotates, and a non-uniformly distributed load is applied to a test piece; the control system, the servo hydraulic system and the monitoring system are combined to realize a quantitative and controllable experiment process and the monitoring and recording of the experiment process. According to the experimental method using the experimental device, non-uniform loading of a rock surface under the action of different initial vertical uniform loads is realized, the method accords with engineering practice. The experimental device and experimental method have the characteristics of simple structure and convenience in use.

Description

technical field [0001] The invention relates to the technical field of rock mechanics experiments, in particular to an experimental device for simulating non-uniform loading in mining, and an experiment method using the experimental device. Background technique [0002] During the construction and operation of underground projects such as coal mining, the rock mass is subjected to complex and diverse stress modes, and the existing indoor simulation experiment devices mostly use simple single conditions, such as compression, shear, and tensile experiments to determine the rock failure mechanism and rock mass. mechanical properties. Such experiments often apply uniform loads, but under actual engineering conditions, some rock mass failures are not the result of uniform loads, such as structures next to gob-side entry retaining, small coal pillars along gob-side entry, and solid coal in gob-side entryways. The side walls are damaged by the force of the rotation of the roof, th...

AI Technical Summary

Problems solved by technology

At present, there are already a small number of experimental equipment and experimental methods for non-uniform loading of rock mass, but the loading method is actually to carry out gradient loading on the long specimen in different regions, and the regional load applied by the sub-loading mechanism is still uniform. Although the load of large-scale specimens can be distributed non-uniformly in different regions to a certain extent, its loading mode, failure form and failure mechanism are still quite different from the actual engineering conditions.

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