Single-crack rock equivalent effective stress coefficient testing device and testing method

Abstract

The invention relates to a single-crack rock equivalent effective stress coefficient testing device and testing method. a triaxial pressure chamber of the testing device is provided with a testing cavity; an axial loading cylinder of an axial pressure loading mechanism is arranged on the top of the triaxial pressure chamber; the internal of the axial loading cylinder communicates with an axial pressure servo pump; the telescoping end of the axial loading cylinder enters the testing cavity; a confining pressure servo pump of a confining pressure loading mechanism communicates with the testing cavity; an upper pressure head and a lower pressure head are vertically arranged in the testing cavity in an opposite manner; the upper pressure head is arranged right under the telescoping end of theaxial loading cylinder and provided with an upper fluid pressure pipeline; the lower pressure head is fixedly arranged at the bottom of the testing cavity and provided with a lower fluid pressure pipeline; the upper and lower fluid pressure pipelines communicate with a fluid pressure servo pump; and a to-be-tested rock having a single crack is placed between the upper pressure head and the lower pressure head. Thus, testing results can be more accurate.

Description

technical field [0001] The invention belongs to the technical field of rock and soil detection, and in particular relates to a single-crack rock equivalent effective stress coefficient testing device and a testing method. Background technique [0002] The single-fracture rock equivalent effective stress coefficient test method takes the shear strength as the main index, and considers the degree of weakening of the shear strength by the fluid pressure in the fracture. Based on the principle of equivalent stress, a test method for the equivalent effective stress coefficient of single-fracture rock is proposed. The concept of effective stress was first proposed by K. Terzaghi to characterize the interaction relationship between the total stress, solid skeleton stress and pore fluid pressure in the soil medium. Later, M.A. Biot revised Terzaghi's effective stress principle and introduced the Biot coefficient , the effective stress coefficient. Effective stress has important ap...

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Problems solved by technology

For fractured reservoirs, fractured fractures during oil and gas production, and hot dry roc

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