Device capable of accurately controlling shield model test excavation face supporting force

Abstract

The invention discloses a device capable of accurately controlling shield model test excavation face supporting force. The device is composed of a pressure transferring device, a pressure supply device and a voltage stabilizing device. Before the test, liquid is added in a hydraulic box, the level value of liquid level in a pressure testing tube is recorded, and pushing force applied to a pressureapplying plate is measured by a stress measuring tool. Under liquid levels with different heights, a liquid level height H-pressure F curve is read and drawn. When the test begins, the device is connected to a tunnel model, the applied pressure required by the test is calculated through the liquid level height H-pressure F curve, and the pressure is applied by controlling the liquid level heightH. During the test process, a minitype self-sucking pump is turned on, by controlling a liquid level lifting plate, and the water pipe inlet of the minitype self-sucking pump closely fits the water surface to ensure that the liquid level height cannot be changed, so that the pressure is kept constant. The device can keep the supporting force of an excavation face constant, the supporting force cannot be changed with the displacement of the excavation face, the variable is single, and analysis is convenient.

Description

technical field [0001] The invention relates to a stress loading device, in particular to a stress loading device for a shield tunnel model test. The invention can be applied in the model test of the stability of the excavation surface of the shield tunnel, and provides a device for accurately controlling the supporting force of the excavation surface. Background technique [0002] With the further enhancement of economic and technological strength, the development of urban underground tunnels has entered an important historical period. As one of the most commonly used tunnel construction methods at present, the shield method has been widely used in tunnel and underground engineering construction due to its advantages of economy, high efficiency and minimal impact on the surrounding environment. In the process of shield tunneling at home and abroad, due to the unreasonable control of the size of the support force of the tunnel excavation surface, accidents of large deformat...

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Problems solved by technology

[0008] 2. When the gas (hydraulic) pressure method is used for stress loading, during the displacement process of the excavation surface, the actual support force of the excavation surface is not only the pressure in the tunnel, but also the reaction force caused by the deformation of flexible materials such as latex film itself , this part is difficult to measure

[0009] 3. When the gas (hydraulic) pressure method is used for stress loading, the displacement of the excavation surface will lead to a decrease in the volume of the tunnel, which will cause a pressure change. This part of the pressure change cannot be accurately controlled

[0010] 4. The above two methods can only simulate the process of slowly reducing the support force from a sufficiently large support force on the excavation surface

It is impossible to simulate the process in which the support force of the excavation face is relatively small from the beginning

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