Testing device and method for permeability coefficient evolution of fractured rock mass

Abstract

The invention provides a testing device and method for permeability coefficient evolution of fractured rock mass. The device comprises a rock core holder, a water injection tank arranged above the rock core holder and a water storage tank arranged below the rock core holder, wherein a storage cavity for accommodating a clamped rock core sample is formed in the middle of the rock core holder; a water feeding port communicated with the storage cavity is formed in the lower part of the water injection tank; a water inlet communicated with the storage cavity is formed in the upper part of the water storage tank; a pressure rod extending into the water storage tank is arranged below the water storage tank and driven by a driving device to operate up and down so as to apply pressure to the rock core sample; a pressing pad layer is arranged on the inner surface of the storage cavity of the rock core holder; a pressing cavity is formed in the pressing pad layer and communicated with a hydraulic pipeline for hydraulic oil feeding; an oil pump is arranged on the hydraulic pipeline. According to the structure, the device is used for testing change characteristics of the permeability coefficient of the single-fracture rock mass in a deformation and failure evolution process under the shear-seepage coupled action, and the change characteristics of the whole process are obtained. Besides, in terms of maintenance of the testing device, the device can be repeatedly used, and parts can be convenient to mount, dismount and replace.

Description

technical field [0001] The invention relates to a test device and a test method for the evolution of the permeability coefficient of a fractured rock mass. Background technique [0002] The fractured rock mass exists in the geological environment and is often subject to the coupling effect of stress and seepage. The result of this action may cause the fractured rock mass to slide and fail along the original cracks, or create new cracks and form a new groundwater flow field. Integral damage occurs to the fractured rock mass, resulting in rock mass disasters. Slope engineering, underground engineering, etc. are often composed of fractured rock mass, and structures such as houses and dams often use fractured rock mass as the bearing layer. The key to the success of these projects often lies in the accurate understanding of the deformation and failure process and mechanism of fractured rock mass under coupled shear-seepage. Among them, the evolution process of the permeability...

AI Technical Summary

Problems solved by technology

[0004] The present invention improves the above-mentioned problems, that is, the technical problem to be solved by the present invention is that the existing testing device for the permeability coefficient of fractured rock mass under the coupled action of shear-seepage is mainly carried out based on a shear box, and the device has a The displacement and pressure values ​​are small and it is impossible to test the permeability characteristics and deformation and failure characteristics of the fractured rock mass under the synergistic effect of pore water and fissure water

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