Model test device and test method for tunnel seepage instability with controllable ground pressure and water pressure

Abstract

The invention discloses a tunnel seepage instability model test device and test method with controllable ground pressure and water pressure. The device includes a medium filling chamber, a loading piston box, a loading system and a water injection system; a reserved hole is arranged below the side wall of the medium filling chamber The top of the medium filling chamber is provided with a loading piston box, the top of the loading piston box is provided with a water inlet, the bottom is provided with a number of water seepage holes, the top of the loading piston box is provided with a loading system, and the water inlet is connected to the water injection system pipeline. The small-volume filling and repeatable operability of the test device of the present invention provides the possibility to study the seepage damage form of tunnels under different ground pressure and water pressure conditions through a large number of tests, and realizes the small-scale tunnel seepage instability model test in a pressurized water environment. The stable and long-term loading of the lower ground stress ensures the consistency between the model test conditions and the simulated engineering conditions, and can be accurately used for the simulation of complex geological conditions in tunnels and mines, providing a strong guarantee for the study of seepage instability mechanisms.

Description

technical field [0001] The invention relates to a tunnel seepage instability model test device and a test method with controllable ground pressure and water pressure, and is a test device for simulating the seepage instability process of underground projects such as tunnels and mines under different ground stress and water pressure conditions . Background technique [0002] In recent years, the construction of underground projects such as tunnels and mines in my country has developed vigorously. However, during the construction process, under the joint action of ground stress and groundwater pressure, underground engineering structures are prone to seepage instability, leading to water and mud inrush accidents. According to incomplete statistics, the frequency of water and mud inrush accidents ranks second in underground engineering accidents, causing a large number of casualties and economic losses. At the same time, it has a great impact on the construction, operation saf...

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Problems solved by technology

[0004] 1. In order to truly and effectively simulate the initial ground pressure and water pressure, the test devices used are usually large in size, and the test is faced with large-scale model filling, complex test operations, long test periods, high funding requirements, and poor test repeatability, etc. question

[0005] 2. In the past, the test device could not control the gradient of ground pressure and water pressure, and it was difficult to systematically study the mechanism of seepage instability

[0006] 3. The size of the test device is too large, which makes it difficult to sample the medium, and it is impossible to conduct microscopic research on the seepage damage form of the surrounding rock of the tunnel. As a result, the research results cannot be directly applied to engineering practice, and the understanding of the seepage instability mechanism is still lagging behind

This test method can only simulate diving conditions, but cannot simulate pressurized water, and cannot control the water pressure of the model

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