A test device and test method for hydraulic splitting of concrete members under triaxial stress

Abstract

The invention discloses a concrete member hydraulic splitting test device and test method under triaxial stress, including a triaxial loading system, a water sealing device, a hydraulic loading system and an acoustic emission testing system; the water sealing device includes two sealing steel plates, T-shaped convex groove, T-shaped sealing gasket, water inlet hole and water outlet hole; two sealing steel plates are attached to the front and rear sides of the concrete member, and both are provided with T-shaped convex grooves, which are respectively connected with prefabricated cracks; Each T-shaped convex groove is sealed with a T-shaped gasket; each T-shaped gasket is equipped with an L-shaped reserved hole; the hydraulic loading system is used to apply a high-pressure water head of 0~400m to the prefabricated crack; The acoustic emission test system is used to monitor the acoustic emission signal of the development and change of prefabricated cracks during the hydraulic splitting process of concrete components. The invention can simplify the test operation process and effectively monitor the splitting process over time, and at the same time realize the hydraulic splitting research of the concrete member under the triaxial stress, which is close to the actual engineering situation.

Description

technical field [0001] The invention relates to the technical field of large-scale concrete building simulation tests in hydraulic engineering and geotechnical engineering, in particular to a hydraulic splitting test device and test method for concrete components under triaxial stress. Background technique [0002] Concrete is a building material widely used in engineering at present. Due to the influence of construction, temperature, material properties, environmental factors, etc., there are inevitably many micro-cracks and pores inside it. When encountering a high water head, the high osmotic pressure can easily make the defects such as micro-cracks and pores in the concrete further develop, expand and extend, and form macroscopic cracks, resulting in hydraulic splitting. The bearing capacity and stability of the structure are significantly reduced, and even catastrophic accidents occur. For example, the anti-seepage curtain of the Kolnbrein arch dam in Austria produced ...

AI Technical Summary

Problems solved by technology

[0005] 1. It cannot truly reflect the phenomenon of hydraulic splitting of the initial cracks of the concrete structure under the action of seepage water pressure in the actual project

[0006] 2. Due to the limitation of the sample form, the time course of splitting cannot be effectively observed

[0008] 1. The requirements for the water sealing device are relatively high. Once the sealing effect of a contact surface is not good, the hydraulic splitting test of concrete components under high water pressure cannot be carried out

[0009] 2. Due to the limitation of the water sealing device, it is impossible to carry out the hydraulic splitting test of concrete members under complex stress, and most of the concrete structures in actual engineering are in a three-dimensional stress state, so there are certain limitations in the form of wedge splitting specimens

[0010] In addition, large-scale true triaxial test equipment can be used to study the hydraulic splitting of concrete members under triaxial stress, but the test equipment takes up a lot of space, the operation is cumbersome, and the cost is high, and it is difficult to realize the hydraulic splitting of concrete members under triaxial stress. Widespread promotion of split test

[0011] In view of this, in order to further study the problem of hydraulic splitting of concrete members, it is necessary to propose a hydraulic splitting test device and test method for concrete members under triaxial stress, which is used to solve the difficulties in the splitting process of concrete hydraulic splitting tests under high water pressure. There are limitations in monitoring and water sealing devices. The existing conventional triaxial test devices are cumbersome to operate, occupy a large physical space, and have high costs.

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