A coupled shear-seepage experimental method for fracture network rocks

Abstract

A coupling experiment device and method for engraving of a fracture network rock test piece and its fracture seepage belong to the fields of hydromechanics and rock mechanics. The method of the invention comprises the following steps: 1. preparing a rock test piece with a certain size required by the experiment; 2. engraving a fracture network by using a full-automatic engraving machine according to real fractures; 3. performing the experiment by using a numerical control direct shearing testing machine with an electro-hydraulic servo microcomputer control system; 4. measuring the pressure of the fracture network, and deriving a flow velocity based on a formula; 5. measuring the change and development state of water or oil in the rock fractures; 6. recording the flowing process and state of colored water in the fractures by a digital video camera; 7. establishing a model with combination of the experiment. The experiment method changes the state in the past that a shearing seepage experiment of a test piece is carried out in a manner that a single fracture is obtained by manual cleavage, and reflects the real state of fractures inside the rock. Experiment materials are low in cost and convenient for manual engraving by onself. The engraving speed is high, the determination device is small in land occupation, and the operation is simple.

Description

technical field [0001] The invention relates to a fracture network rock shear-seepage coupling experiment method, which belongs to the fields of fluid mechanics and rock mechanics. Background technique [0002] As we all know, rock foundations generally contain many discontinuous structures such as joints and fissures, and the interior of the fissured rock mass is rich in various defects, including micro-cracks, pores, and joint fissures. Under the action of the environment, subject to the complex effects of stress and water physics and chemistry, these defects have a great impact on the mechanical behavior and stability of the rock mass. Because a large number of complex cracks are distributed in the natural rock mass, the mechanical properties and permeability of the rock mass are non-uniform and anisotropic, which not only greatly changes the mechanical properties of the rock mass, but also seriously affects the permeability of the rock mass. characteristic. [0003] As...

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Problems solved by technology

Liu Yachen et al. have studied the permeability characteristics of fractured rock mass under high temperature and high pressure through single and orthogonal fractures, but the research or experiment on fracture network has made slow progress.

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