A sample preparing method for a stress seepage coupling test of a large-size single-crack rock mass

Abstract

The invention relates to the technical field of rock mass seepage tests, and particularly relates to a sample preparing method for a stress seepage coupling test of a large-size single-crack rock mass. Two rock masses of the same material are stacked up and down, with the lower surface of the upper cracked rock mass and the upper surface of the lower cracked rock mass forming a contact surface; the upper surface of the lower cracked rock mass is provided with a loop groove in which a sealing ring is arranged; a plurality of through holes are drilled in the upper cracked rock mass, and the lower end surfaces of the through holes are in a zone surrounded by the sealing ring of the lower cracked rock mass; and water flow flows in from a part of the through holes in the upper cracked rock massto achieve seepage in the sealing ring of the contact surface, and the water flows out from the rest through holes of the upper cracked rock mass. The method avoids a cavity with a certain volume forcovering, and a seepage test result can accurately reflect mechanical performance of the cracked rock mass itself under mechanical functions. The method is suitable for seepage sealing of a cracked rock mass with various dimensions, such as conventional centimeter-level dimensions or dimensions above the meter level.

Description

technical field [0001] The invention belongs to the technical field of rock mass seepage tests, and in particular relates to a sample preparation method for a large-scale single-crack rock mass stress-seepage coupling test. Background technique [0002] The permeability performance of fractured rock mass under different stress states is the basic mechanical property test of fractured media. The permeability coefficient of fractured rock mass and related studies belong to the research category of the basic mechanical properties of fractured media, and it plays a fundamental guiding role in the engineering construction conditions of fractured rock mass. For quasi-brittle rock materials with fractures, the permeability is an important factor to determine the long-term safety of engineering rock mass. Ensuring that the fractured medium can achieve sealing in the penetration test under different pressure combinations (normal stress and tangential pressure) is the premise of accu...

AI Technical Summary

Problems solved by technology

This sample preparation method only reflects the permeability of the fractured rock mass wrapped inside the cavity under different mechanical actions, and cannot reflect the mechanical properties of the fractured rock mass itself under mechanical action

More importantly, this method has great limitations. It can only be used in small volumes of fractured rock mass, and is not suitable for sealing fractured rock masses in the larger scale range of meters and above.

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