A bearing plate for real-time collection of vertical stress at each point on the end face of coal and rock mass

Abstract

A pressure bearing plate for real-time collection of vertical stress at each point on the end face of a coal rock mass, mainly including bearing columns, bearing rings, vertical strain gauges, horizontal strain gauges, wires and bases, characterized in that the bearing columns are located in the middle, and the outer bearing columns are covered with There are multiple bearing rings. The number of bearing rings can be increased or decreased according to the size of the rock sample to be measured. There is a compensation gap between adjacent bearing rings. There are horizontal strain gauges and vertical strain gauges distributed in the groove, the strain gauges are distributed in pairs, and are connected with wires, the lower side of the bearing ring is provided with a wire collecting groove, and the lowermost end of the bearing ring is provided with a horizontal cut groove, the wire collecting The groove and the horizontal cutting groove are on the same vertical plane, and can match each other to output the wire. The bottom end of the bearing column and the bearing ring is equipped with a base. effect, and can realize the vertical stress on the end face of the specimen.

Description

technical field [0001] The invention relates to a testing device for the stress on the end face of a coal rock mass, in particular to a pressure bearing plate for real-time collection of the vertical stress at each point on the end face of a coal rock mass. Background technique [0002] In the field of geotechnical engineering and mining engineering, understanding the mechanical properties of rock or coal is one of the major prerequisites for subsequent engineering. Only after fully grasping the mechanical parameters of the rock can the possibility of engineering implementation be fully evaluated and carried out. guide. As we all know, rock is a heterogeneous substance with natural defects, and its various mechanical indicators need to be combined with on-site and laboratory evaluation tests to obtain accurate and scientific definitions. Under the current technical conditions, the tests of its mechanical properties are mostly carried out in laboratories. According to the un...

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Problems solved by technology

[0006]In order to overcome the stress concentration caused by uniaxial compression in the prior art, resulting in uneven distribution of stress at the end, and then disturbing the mechanical parameters of the rock sample The accuracy of the output, and the lack of interference to the acoustic emission, the present invention provides a strong adaptability, good technical effect, can adapt to different strengths of rock or coal, relatively broad requirements for the size of the sample, eliminating the need for single-axis The end face effect of the test piece during the compression process, and can realize the vertical stress of the end face of the test piece, a pressure bearing plate that can collect the vertical stress of each point of the end face of the coal rock mass in real time

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