Bearing plate collecting vertical stress of each point on coal-rock mass end face in real time

Abstract

A bearing plate collecting vertical stress of each point on a coal-rock mass end face in real time mainly comprises a bearing rod, bearing rings, vertical strain gauges, horizontal strain gauges, a line and a pedestal; the features are that the bearing rod is arranged in the center and sleeved by a plurality of bearing rings; the number of the bearing rings correspondingly changes according to the size of a measured rock sample; a compensation gap is arranged between adjacent bearing rings; a middle lower portion of the bearing rod and bearing rings is provided with an annular slot; the horizontal strain gauges and vertical strain gauges are arranged in the annular slot, arranged in pairs and connected with the line; one side on the lower portion of the bearing ring is provided with a line concentration slot; the downmost end of the bearing ring is provided with a horizontal groove; the line concentration slot and the horizontal groove are on a same vertical line and mutually matched so as to output the line; the bottom of the bearing rod and the bearing rings is provided with the pedestal. The bearing plate is strong in adaptability and good in technical effect, can remove test piece end face effect in a single shaft compression process, and can realize the test piece end face vertical stress collection.

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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