Testing device for simulating concrete test piece hydraulic fracture under multi-field coupling condition

Abstract

The invention relates to a testing device for simulating concrete test piece hydraulic fracture under a multi-field coupling condition. The testing device is characterized in that a large cylindrical pressure chamber is manufactured specifically, copper pipes are arranged on the inner wall of the pressure chamber, and the copper pipes are connected with an external refrigerating and heating system to control the temperature in the pressure chamber. A set of steel frame clamp manufactured specifically is fixed on a base plate of the pressure chamber, and a test piece is placed in the steel frame clamp. Water pressure is exerted on the test piece through a steel external member at the bottom of the test piece and a water permeable copper plate, and water is guided out from a steel external member on the upper portion of the test piece and the water permeable copper plate through a water pipe. Fracture water pressure and environment temperature simulation is added on the basis of a conventional three-shaft test. The device overcomes the defect that a traditional hydraulic fracture test can not simulate temperature environment change, can reflect a testing theory of the hydraulic fracture truly and is suitable for test research on concrete test piece hydraulic fracture under the water solid thermal coupling condition. The testing device has good market transformation prospects and is suitable for popularization.

Description

technical field [0001] The invention relates to a test device for simulating hydraulic splitting of a concrete specimen under multi-field coupling conditions. Background technique [0002] With the continuous completion and operation of large-scale water conservancy and hydropower projects, there are more and more large-scale hydraulic concrete structures. Affected by design, construction and maintenance, cracks in concrete are almost inevitable, and high dams are built in deep water. It operates under the action of pressure and temperature changes, so the present invention refers to the problem of hydraulic splitting under the condition of simulating multi-field coupling, especially the influence of temperature on hydraulic splitting can be measured, because the stable temperature environment is difficult to simulate, coupled with hydraulic The splitting test itself is difficult and complex. Due to the limitations of model materials, manufacturing methods, and measurement t...

AI Technical Summary

Problems solved by technology

[0002]With the continuous completion and operation of large-scale water conservancy and hydropower projects, there are more and more large-scale hydraulic concrete structures. Affected by design, construction and maintenance, concrete Cracks are almost unavoidable, and high dams operate under the influence of deep water pressure and temperature changes, so the present invention refers to the problem of hydraulic splitting under the condition of simulating multi-field coupling, especially can measure the effect of temperature on hydraulic splitting. Due to the difficulty of simulating the stable temperature environment, and the difficulty of hydraulic fracturing test itself, the equipment is complicated. Due to the limitations of model materials, manufacturing methods, and measurement techniques, previous experimental studies have failed. A splitting test that comprehensively studies the influence of temperature, and this test puts the entire hydraulic splitting device in a sealed chamber, which can not only load axial pressure and confining pressure, but also ensure a stable and widely varying temperature environment

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