Visual test device and test method for simulating hydraulic fracture of core wall dam

Abstract

The invention discloses a visual test device and test method for simulating hydraulic fracture of a core-wall dam. The visual test device comprises a pressure chamber shell, a confining pressure applying mechanism, an axial pressure applying mechanism, a sample crack breaking mechanism and a monitoring mechanism. The pressure chamber shell comprises a base, a pressure chamber top cover, a steel plate and high-strength tempered glass. A core wall sample is placed in the middle of the pressure chamber, sand layers are arranged on two sides of the core wall sample, and confining pressure cavitiesare formed between the sand layers and the steel plates; the core wall sample has an initial crack; the initial crack is filled with a sand layer with a color tracer agent; the confining pressure applying mechanism comprises a confining pressure inlet hole, a confining pressure outlet hole and a confining pressure overflow pipe; the axial pressure applying mechanism is used for applying axial pressure to the core wall sample; the sample crack breaking mechanism comprises a water pressure inlet hole and a water pressure outlet hole; the monitoring mechanism comprises a confining pressure sensor, a water pressure sensor, an axial pressure sensor and an electromagnetic flowmeter. According to the invention, the visualization of the hydraulic fracture test process can be realized such that the device and the method can be effectively applied to the research of the hydraulic fracture test of the core-wall dam.

Description

technical field [0001] The invention relates to the technical field of hydraulic engineering, in particular to a visual test device and a test method for simulating hydraulic splitting of a core wall dam. Background technique [0002] The core wall is an important structural part of an earth-rock dam, the characteristics of the core wall are the focus of research, and the hydraulic splitting of the core wall is one of the key issues that the engineering community pays close attention to and needs to be solved urgently. At present, hydraulic splitting tests of clay core dams can be divided into laboratory tests, field tests and model tests. Indoor tests are convenient for accurate control of test conditions and have strong repeatability, so they are widely used. [0003] However, the existing laboratory tests of hydraulic splitting of the core wall of earth-rock dams still have the following defects: [0004] 1. It cannot effectively monitor the change law of pore pressure ...

AI Technical Summary

Problems solved by technology

[0004] 1. Cannot effectively monitor the change law of pore pressure in the process of sample destruction

[0005] 2. The core wall sample does not consider the influence of upstream and downstream reverse filter layers, and cannot simulate the combined effect of clay and reverse filter materials

[0006] 3. The environment of the sample is a black box closed environment, and the destruction process of the sample cannot be observed in real time

[0007] Therefore, the existing tests cannot effectively monitor the hydraulic splitting process of the core wall dam, and the test results are difficult to apply to actual engineering

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