Pressure-bearing device for simulating high-energy-storage rock mass excavation unloading test and sealing method

Abstract

The invention discloses a pressure-bearing device for simulating a high-energy-storage rock mass excavation unloading test, which comprises two pressure-bearing blocks, a sleeve and a sealing ring, wherein the two pressure-bearing blocks are respectively arranged at two ends of a to-be-tested rock mass; the sleeve can sleeve the to-be-tested rock mass and the pressure-bearing block and is attached to the to-be-tested rock mass and the pressure-bearing block; and the sealing ring sleeves the pressure-bearing block and the sleeve through the fastening element, so that the sealing ring can be tightly pressed on the sleeve and the pressure-bearing block. The invention further discloses a sealing method for simulating the excavation unloading test of the high-energy-storage rock mass, which comprises the following steps of symmetrically arranging the two pressure-bearing blocks at two ends of the to-be-tested rock mass by using the pressure-bearing device, sleeving the to-be-tested rock mass and the pressure-bearing blocks with the sleeve, sleeving the pressure-bearing blocks and the sleeve with the sealing ring, pressing the sealing ring on the sleeve and the pressure-bearing block through the fastening element, so that the sealing purpose is achieved. The abutting surfaces of the sealing ring, the pressure-bearing block and the sleeve are inclined surfaces, so that the damage to the sleeve caused by stress concentration is avoided.

Description

technical field [0001] The invention relates to the technical field of indoor rock mechanics experiments, in particular to a pressure-bearing device and a sealing method for simulating high-energy storage rock mass excavation and unloading tests. Background technique [0002] The excavation and unloading conditions of high energy storage rock mass at engineering scale can be realized through the loading and unloading path of conventional triaxial test of rock mass at laboratory scale. When simulating the stress state of high-energy storage rock mass before excavation in the laboratory, it is necessary to apply high confining pressure to the rock mass, and the confining pressure value reaches tens or even hundreds of MPa; when simulating the stress state of the excavation process, it is necessary to Quickly remove the high confining pressure of the rock mass. In order to ensure that the test values ​​are true and effective, it is necessary to prevent hydraulic oil from enter...

AI Technical Summary

Problems solved by technology

Although this patent has a good sealing effect between the rock mass and the indenter, for large-scale rock mass, the weight of the circumferential boss is relatively large, which is not conducive to the sealing operation of testers, especially those with less strength. and, after the high confining pressure loading and unloading test, the position where the pressure head is in contact with the oil cylinder is difficult to disengage instantly due to the existence of the hydraulic oil film, or it may disturb the rock mass after the test and destroy the original state of the rock mass after the test

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