Large-size rock fracture permeability test system and measuring method thereof

Abstract

The invention relates to a large-size rock fracture permeability test system and a measuring method thereof. The large-size rock fracture permeability test system comprises a self-circulation water supply tank, a constant-pressure water tank, a water inlet end cap, a water outlet end cap, a horizontal rock fracture, pitot piezometer tubes and a constant water head water collecting system, the self-circulation water supply tank is connected with the constant-pressure water tank through a water supply tube and a water return tube, the water inlet end cap is connected on the constant-pressure water tank, two ends of the horizontal rock fracture are abutted to the water inlet end cap and the water outlet end cap respectively, the pitot piezometer tubes are arranged on the water inlet end cap and the water outlet end cap respectively, and the constant water head water collecting system is connected with the water outlet end cap. The large-size rock fracture permeability test system is simple in structure, convenient to operate and high in test accuracy and can make permeability test research on rock fractures with series of sizes (10cm*10cm-100cm*100cm), and change laws of rock fracture permeability changing along with the sizes of the fractures are analyzed.

Description

technical field [0001] The invention relates to a permeability test system and a measurement method thereof, in particular to a large-scale rock fissure penetration test system and a measurement method thereof, and belongs to the technical field of fracture rock mass hydraulic tests. Background technique [0002] The permeability of fractures has a size effect and increases with the increase of fracture size. Small-scale fracture permeability tests often underestimate the actual permeability of fractures. However, small-scale penetration tests are often used to study the permeability of fractures due to their low cost and simple operation, which reduces the reliability and reliability of the research results to a certain extent. Application value, the change of permeability from small size to large size is not simply a matter of linearly amplifying the permeability coefficient. There are many influencing factors involved, and the control mechanism is not yet clear. It is a c...

AI Technical Summary

Problems solved by technology

Small-scale fracture permeability tests often underestimate the actual permeability of fractures. However, small-scale penetration tests are often used to study the permeability of fractures due to their low cost and simple operation, which reduces the reliability and reliability of the research results to a certain extent. Application value, the change of permeability from small size to large size is not simply a matter of linearly amplifying the permeability coefficient. There are many influencing factors involved, and the control mechanism is not yet clear. It is a complicated change process

[0003] However, limited by various objective conditions, especially by sample preparation technology and existing test equipment, the size of the sample studied in the fracture penetration test is relatively single, and the size is small (diameter not exceeding 30cm). Up to now, there is no relevant A report on a series of scale-scale rock fracture penetration tests

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