Device and method for clay core wall hydraulic fracturing experiments

Abstract

The invention relates to a device and a method for clay core wall hydraulic fracturing experiments under simulated coupling conditions. The method is characterized in that two semi-cylindrical molds are specially made and assembled into a sample mold which is easy to assemble and disassemble; the internal temperature of a pressure chamber is controlled through changing the temperature and amount of water in a copper water pipe; internal water pressure is applied to a sample by a water flow passing through a base of the pressure chamber, a permeable plate, coarse sand and finally a blowhole; and hydraulic fracturing features of the clay sample under different conditions are studied through changing the water temperature and loading schemes of the fracturing water pressure, the axial pressure and the confining pressure, etc. The method overcomes the defects of hydraulic fracturing experiments in the prior art on core walls of earth and rock-fill dams, simulates features, force conditions, influencing factors and the like of clay core walls more accurately, and thus can be widely applied in hydraulic engineering and geotechnical engineering.

Description

technical field [0001] The invention relates to a hydraulic splitting test device and a test method of a clay core wall under simulated coupling conditions. Background technique [0002] In the high earth-rock dam projects that have been built and are under construction, clay is generally used as the anti-seepage material, and the mechanical properties of the clay material and the dam shell material are quite different. Therefore, it is necessary to study the hydraulic splitting of the clay core wall through experiments. mechanism. At present, the hydraulic splitting test can be divided into indoor test, field test and model test according to the test method. Among them, the indoor test generally adopts a cylindrical sample (thick-walled or thin-walled cylinder) or a rectangular parallelepiped sample with a central hole (cylindrical hole) or slit ("envelope"-shaped crack). Water was injected in the middle until the sample was split, so as to discuss the occurrence conditio...

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Problems solved by technology

[0004] The present invention aims at the defects of the existing earth-rock dam core wall hydraulic splitting test device, and proposes a clay core wall hydraulic splitting test device and test method that can simulate coupling conditions, which can more truly reflect the characteristics and impact of the clay core wall. Force conditions and influencing factors

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