Creep permeation full-distance coupling test system for broken rock sample

Abstract

The invention relates to a creep permeation full-distance coupling test system for a broken rock sample, and the system provided by the invention comprises a hydraulic axial loading system, a permeating system and a data display and monitoring device, wherein the axial loading system is used for supplying and maintaining a stable oil-way pressure through a plunger pump, an electromagnetic relief valve, an one-way valve, a pressure relay, an energy storage and a two-position four-way reversing valve; the axial loading system is also used for loading and maintaining an axial force by utilizing the stable pressure in the oil-way through a hydraulic cylinder, a circular tube and a piston; the permeating system is used for permeating the broken rock sample sealed in a cylinder from bottom to top by utilizing a motor-driven pressure-testing pump, a water inlet pipe, the one-way valve, a felt layer and a porous water-permeable plate; the creep and permeation test process is displayed and monitored in real time by using a pressure gage, a water pressure gauge, a pressure sensor, a displacement meter and a flow sensor; and the whole system is arranged on a flat cart with idler wheels, thereby facilitating movement. The system has a simple structure, is quickly sealed, is conveniently operated, and is suitable for the compression creep, permeation and creep permeation full-distance coupling test for the broken rock.

Description

technical field [0001] The invention relates to a test system and a test method for the mechanical properties of broken rock, in particular to a test system for full-process coupling of creep and penetration of broken rock samples. Background technique [0002] Broken rock widely exists in nature and engineering. The deformation and seepage behavior of broken rock mass with residual bearing capacity in mining engineering will have a serious impact on the migration of liquid and gas inside the rock mass, as well as ground buildings and the environment. Broken rock mass has the characteristics of large porosity and high permeability, and its permeability is one to several orders of magnitude larger than that of intact rock mass. Therefore, major disasters and accidents caused by seepage in rock engineering often occur in broken rock mass. The creep behavior of the broken rock mass will cause the subsidence of the ground buildings above the stope, the reaction force of the roa...

AI Technical Summary

Problems solved by technology

Although the MTS system rock mechanics test system imported from the United States currently used in China can be used in conjunction with the domestically produced broken rock permeameter (patent ZL02219458.4), although the creep and penetration tests of broken rocks can be performed, due to the penetration rate in the broken rock penetration test Larger, the creep duration is longer, but the water injection capacity of the supercharger of the seepage system is small, and the piston stroke is only 100mm, resulting in the discontinuity of the seepage process during the creep process

Moreover, the system is expensive and has a complicated structure, and only specially trained test personnel can operate this equipment; some test devices use a hand pump to apply axial load, seepage pressure difference and confining pressure to the rock sample, due to the flow rate of the hand pump It is very small, so it is only suitable for the permeability test of low permeability rock samples

To sum up, none of the existing rock mechanical creep or penetration devices can meet the requirements of penetration tests and data collection and analysis for the whole creep process of broken rocks.

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