Experimental method for compressive load bearing of different scales of broken coal and rock under variable pre-tightening force

Abstract

The invention discloses a different-scale crushing coal rock compression carrying experiment method under the effect of variable pre-tightening force. The method mainly comprises the following steps of putting a fixing device onto the bottom loading axis of a rigid experiment machine; determining the installation position of a slide moving device according to the coal rock body scale parameter; performing monitoring device debugging and horizontal pre-tightening force applying according to the designed coal rock body anchoring parameter; performing crushing coal rock body material charging andfilling and leveling in a carrying box; performing a single-shaft compression carrying experiment on the crushing coal rock body under the effect of the pre-tightening force; analyzing the collectedhorizontal and vertical direction data of the crushed coal rock body. The method has the characteristics that the operation is easy; the steps are reasonable; the experiment is precise, and the like.The carrying characteristic relationship of the underground engineering coal rock body scale and the pre-tightening force anchoring is shown again; in addition, the basis is provided for the reasonable coal rock column dimension remaining and surrounding rock pre-tightening force anchoring control.

Description

technical field [0001] The invention relates to an experimental method for compression load bearing of broken coal and rock under the action of pre-tightening force. The test device for compressive load-bearing of broken coal and rock of different scales under the action of variable pre-tightening force designed by itself is placed on a rigid testing machine for horizontal pre-tightening force. The following uniaxial compression test method for broken coal rock, specifically related to the experimental method in the laboratory. Background technique [0002] With the gradual depletion of coal resources and the increase of mining depth, more and more people pay more and more attention to the disadvantages of coal pillars left in underground mines and roadway surrounding rocks suffering from high stress levels. As we all know, the larger the coal pillar size is, the more coal resources are wasted. On the other hand, in the high-stress environment under the condition of small co...

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Problems solved by technology

[0004] Aiming at the problems of inconsistent operation methods and complicated experimental process of self-designed compressive load-bearing experimental devices for different scales of broken coal and rock under the action of variable pre-tightening force, the present invention proposes a compression load-bearing test of different scales of broken coal and rock under the action of variable pre-tightening force method, this experimental method is used in conjunction with the experimental device for crushing coal rocks of different scales under the action of variable preload, the fixing device is easy to operate, the sliding device is easy to adjust, and the data of the monitoring device is comprehensive. The load-bearing characteristics of rocks under the same preload conditions and the load-bearing characteristics of broken coal rocks of the same scale under different preload conditions have realized the load-bearing characteristics of broken coal rocks under different scales and different preload conditions under the same geological conditions. Quantitative monitoring

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