Test method and device for simulating high-ground-pressure environment through bentonite slurry pressurization

Abstract

The invention discloses a test method and a test device for simulating a high-ground-pressure environment through bentonite slurry pressurization. The test method comprises the following steps of (a) manufacturing a test soil sample on a bottom cover of a test barrel, and molding the test soil sample on the bottom cover; (b) covering the molded test soil sample with a bentonite permeation prevention blanket; (c) smearing the outer surface of the bentonite permeation prevention blanket with bentonite plaster; (d) fixedly mounting the bottom end of the test barrel on the bottom cover, and closing an opening in the upper end of the test barrel through an upper end cover; (e) opening an emptying valve and a liquid inlet valve, switching on a slurry pump, injecting slurry into the test barrel, and closing the emptying valve until an emptying pipe can continuously leak slurry; (f) continuing to inject the slurry into the test barrel through the slurry pump to pressurize the test barrel until the test barrel gets the required pressure, closing the liquid inlet valve, and switching off the slurry pump. The test device can apply high surrounding pressure to a large test piece with a convex-concave surface so as to perform a high-ground-pressure environment simulation test; furthermore, devices such as a model freezing pipe and a sensor which are buried into the test sample cannot be damaged.

Description

technical field [0001] The invention relates to a confining pressure loading method for a rock and soil test piece, in particular to a test method for simulating a high ground pressure environment by pressurizing bentonite mud. Background technique [0002] At present, there are mainly two methods for confining pressure loading of rock and soil specimens. One is to isolate the specimen with a film or heat shrinkable material, and then use hydraulic oil to load the specimen under confining pressure. This test method is suitable for The whole is relatively dense and the surface is relatively smooth. Using this method to load a large test piece with a large amount of compression deformation, the diaphragm material is easily embedded in the sample under the confining pressure and is punctured by the sample particles, and the hydraulic oil will enter the inside of the test piece through the rupture, resulting in test failure. And the specimen is polluted, so if this method is lo...

AI Technical Summary

Problems solved by technology

Using this method to load a large test piece with a large amount of compression deformation, the diaphragm material is easily embedded in the sample under the confining pressure and is punctured by the sample particles, and the hydraulic oil will enter the inside of the test piece through the rupture, resulting in test failure. And the specimen will be polluted, therefore, if this method is applied to large rock and soil specimens, it is only suitable for the condition of small confining pressure

The other is to make and tamp the test piece in the test cylinder, pour isolation material on the upper surface of the sample, and then

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