Test device for determining permeability of large-scale single fracture medium under triaxial stress

Abstract

Belonging to the technical field of medium permeability determination, the invention in particular relates to a test device for determining the permeability of a large-scale single fracture medium under triaxial stress. The device provided by the invention includes: a hydraulic source, an oil distributor, a pipeline pump, a water source, a permeability measurement system, a data collector, a console and a fracture medium permeability test host. The device provided by the invention provides a solution to the technical problems that test devices for testing fracture medium permeability in the prior art can only measure small-scale medium objects and are difficult to realize accurate measurement of large-scale medium objects. The device not only can accurately measure the permeability of large-scale (meter scale) medium objects, but also can ensure the stability and continuity of input and output flow.

Description

technical field [0001] The invention belongs to the technical field of medium permeability measurement, and in particular relates to a large-scale single-crack medium permeability measurement test device under the action of triaxial stress. Background technique [0002] The permeability of large-scale single-fracture media is an important mechanical property of fractured media. For quasi-brittle rock materials with fractures, permeability is an important factor determining the long-term safety of engineering rock mass. The permeability parameters for evaluating the long-term stability of engineering rock mass are obtained through the penetration test of the fractured medium under the condition of fluid ingress. Due to the large scale of engineering rock mass (meter scale), it is necessary to apply seepage loading force and external force to the fractured rock mass in a larger scale to obtain the permeability performance under this seepage condition. Therefore, how to realiz...

AI Technical Summary

Problems solved by technology

[0003] Existing test devices used to test the permeability of fractured media measure small scale objects (centimeter scale), and the obtained permeability parameters are not accurate when applied to engineering

For example, the permeability parameters of smaller-scale fractured media are often smaller than those of larger-scale fractured media, resulting in conservative engineering design values; the permeable surface characteristics of smaller-scale fractured media are not obvious, and the Problems such as the inability to characterize the surface of large-scale fractured media affect the accuracy of measurement results

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