Tunnel seepage instability model test device and test method with ground pressure and water pressure controllable

Abstract

The invention discloses a tunnel seepage instability model test device and test method with the ground pressure and the water pressure controllable. The device comprises a medium filling chamber, a loading piston box, a loading system and a water injection system; a reserved hole is formed in the lower portion of the side wall of the medium filling chamber; the loading piston box is arranged at the ceiling of the medium filling chamber, a water inlet is formed in the top of the loading piston box, multiple water seepage holes are formed in the bottom of the loading piston box, the loading system is arranged at the top of the loading piston box, and the water inlet is connected with a pipeline of the water injection system. Through low-capacity filling and repeatable operability of the test device, possibility is provided for researching the seepage failure forms of a tunnel under different ground-pressure and water-pressure conditions through a great number of tests, the ground stress can be loaded to a small-size tunnel seepage instability model in a stable and long-acting mode under a pressure water environment, consistency between the model test conducting condition and the simulation engineering condition is guaranteed, the test device can be accurately applied to simulation of complicated geological conditions such as a tunnel and a mine, and powerful guarantee is provided for research 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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