A test device for hydraulic splitting of soil core wall

Abstract

The invention discloses a test device for hydraulic splitting of a soil core wall. It is used in the technical field of hydraulic engineering and includes a top cover, a base, a permeable plate, a sample test chamber located under the permeable plate, an axial pressure measurement component, and a pore water pressure component. and pressure components. The top cover, the base and the sample test chamber form a hollow sealed structure, and the pore hydraulic components are located inside the sample test chamber. The confining pressure component is located outside the sample test chamber and wraps the sample test chamber inside. The axial pressure measurement assembly consists of a steel shaft, a damper and a load cell on the damper. A steel shaft passage is arranged on the top cover, and the steel shaft passes through the steel shaft passage and is connected with the damping device. The damping device is located above the center of the permeable plate and connected with the permeable plate. The diameter of the permeable plate is equal to the diameter of the sample test chamber. The invention can be used to study the anti-seepage mechanism under the joint action of clay and reverse filter, and can accurately simulate the stress state of the core wall clay and reverse filter layer with unequal stress.

Description

technical field [0001] The invention relates to a test device for hydraulic splitting of a soil core wall, belonging to the technical field of hydraulic engineering. Background technique [0002] At present, the hydraulic splitting tests of high clay core dams can be divided into laboratory tests, field tests and model tests. 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 conditions of hydraulic splitting, the development form of cracks and its influencing factors. 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 followi...

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Problems solved by technology

[0003] However, the existing laboratory tests of hydraulic splitting of the core wall of earth-rock dams still have the following defects: 1. The clay sample is prone to deformation during the moving process, resulting in a decrease in the strength of the sample or a change in the initial stress state, etc.

2. The core wall sample does not consider the influence of the reverse filter layer, and cannot simulate the joint action of clay and reverse filter

3. The stress state of the core wall material cannot be accurately simulated without considering the unequal stress of the core wall clay and the filter layer

Therefore, these tests cannot truly simulate the characteristics and stress conditions of high-clay core dams

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