Testing device and measuring method for anchorage performance of coal and rock mass in coal mine tunnel

Abstract

The invention relates to the technical field of coal mining, and in particular relates to a testing device and a measuring method for the anchorage performance of a coal and rock mass in a coal mine tunnel. The testing device comprises a force applying device, a forcemeter, a first displacement sensor, a first anchor rod and a second anchor rod, wherein the first anchor rod and the second anchor rod are fixedly anchored on the coal and rock mass in the coal mine tunnel; the force applying device and the forcemeter are arranged on the first anchor rod; the force applying device is used for applying a drawing force on the first anchor rod; the forcemeter is used for detecting the magnitude of the drawing force of the force applying device to the first anchor rod; one end of the first displacement sensor is fixed on the first anchor rod while the other end of the first displacement sensor is fixed on the second anchor rod; and the first displacement sensor is used for detecting the displacement of the first anchor rod relative to the second anchor rod under the drawing force of the first anchor rod applied by the force applying device. The device and the method have the beneficial effects that a stably-positioned reference point is obtained in the coal mine tunnel, so that a relation curve between the drawing force and the displacement of the anchor rod can be obtained by measuring multiple groups of drawing forces and the displacements of the anchor rods on the basis of the reference point. Thus, the foundation for further understanding the anchorage performance of the coal and rock mass and carrying out the supporting design on the anchor rods is laid.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a coal mine roadway coal rock mass anchorage performance test device and measurement method. Background technique [0002] With the continuous improvement and improvement of prestressed bolt support technology, the continuous development and improvement of anchorage theory, and the development and development of new high-strength and ultra-high-strength bolt materials, prestressed bolts have been widely used in water conservancy and mines. , transportation, construction and other fields of underground projects. [0003] The geomechanics evaluation should be carried out before bolt support design of coal mine roadway. The content of geomechanics evaluation of coal roadway surrounding rock includes site geological conditions and production condition investigation, measurement of physical and mechanical properties of coal roadway surrounding rock, observation of surrounding...

AI Technical Summary

Problems solved by technology

It can only measure the pull-out force when the bolt slides or breaks, but cannot obtain the pressing amount of the tray and other surface protection components on the coal wall and the pull-out force and bolt displacement curves at each mechanical stage. Lack of reliable basic data for design

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