Apparatus and method for layered settlement test of tunnel surrounding rock suitable for simulation experiments

Abstract

The embodiment of the invention provides a device and method applicable to layered settlement test of tunnel surrounding rock of simulation experiment. The device comprises a resistance coil, testing points and a resistance reading instrument, wherein the testing points are arranged on the resistance coil; guide lines educed from the testing points and a guide line educed from the top end of the resistance coil are respectively connected onto the resistance reading instrument; the testing points are plastic discs, and electric brushes are fixed in the four directions of the plastic discs and are contacted with the resistance coil. Ring-shaped conductors in the plastic discs are provided with wiring terminals; one guide line is educed from one wiring terminal and is connected to the resistance reading instrument. The device and the method provided by the embodiment of the invention have the advantages that the need for indoor model test of layered settlement of the tunnel surrounding rock can be well met, the variation of the positions of the testing points can be conveniently obtained by determining the resistance of the coil at the testing points, and further the settlement values of the testing points are obtained; and the testing points are independent from each other, so that the mutual influence between magnetic rings with closer distance in the traditional testing instrument is reasonably avoided.

Description

technical field [0001] The invention relates to the technical field of tunnels, in particular to a device and method for layered settlement testing of tunnel surrounding rock suitable for simulation experiments. Background technique [0002] my country is a big country of tunnels, and it is moving towards a strong tunnel country. The country invests a lot of human, financial and material resources every year to support the development of transportation. Among them, tunnel construction is an important link. Many issues require effective scientific research. As a very effective research method, The indoor model test is widely used at home and abroad because of its advantages of good simulation of actual engineering, easy control, and strong repeatability. [0003] The surrounding rock of the tunnel refers to the rock mass within a certain distance around the tunnel after the excavation of the tunnel, which is affected and disturbed. The layered settlement of the surrounding ro...

AI Technical Summary

Problems solved by technology

[0005] The shortcoming of the surrounding rock layered settlement test instrument in the above-mentioned prior art is: this device cannot be used in the model test, and the main reasons include:

[0006] 1. The test accuracy of the magnetic ring and magnetic induction sensor is not enough, because the magnetic induction test is a range, the error is relatively small in the actual project with a large size, and the indoor model test is often reduced in size by dozens of times, this type of magnetic induction test method cannot guarantee Test accuracy

[0007] 2. The presence of magnetism will affect the magnets accordingly. In a small model test, the magnets at different positions will be relatively close, thereby affecting each other, resulting in the inability to obtain correct data

[0008] 3. Existing testing methods cannot monitor the whole process in real time, and can only measure the measuring points one by one in a certain order, which is difficult to meet the experimental needs

Moreover, the presence of loading equipment during the experiment caused the simulated surface to be covered by the loading equipment, making it impossible to measure

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