Combined Adjustable Confined Concrete Arch Large-Scale Mechanical Test System

Abstract

The invention relates to a combined adjustable constrained concrete arch large-scale mechanical test system, which includes a monitoring system for monitoring and collecting arch parameter data, a hollow cylindrical reaction force structure, a hydraulic loading device, an auxiliary loading device, and an inner cylinder of the reaction structure. There are multiple cylinder positioning holes distributed on the surface. A hydraulic loading device is fixed in the cylinder positioning hole. The hydraulic loading device includes a hydraulic cylinder in the cylinder positioning hole, a force transmission dispersion device and a control system connected to the hydraulic cylinder. The hydraulic cylinder passes through The force transmission and dispersion device contacts the arch frame to be tested to achieve loading. The invention can realize 1:1 mechanical tests on restrained concrete arches and other conventional arches, and can also realize tests on arches of different sizes and shapes.

Description

technical field [0001] The invention relates to a large-scale mechanical test system of a combined adjustable constrained concrete arch, which belongs to the field of mechanical tests of underground engineering support materials. Background technique [0002] With the development of our country's economy and society, more and more underground mines, tunnels, subways, hydropower chambers, etc. are being built, and the support problems faced by them are becoming more and more prominent. Especially when the burial depth and section design are large, or in some weak strata, the surrounding rock is loose and broken, and the self-stabilization time of the surrounding rock after excavation is short, while the traditional bolt, shotcrete or steel arch, Failure to provide sufficient initial support resistance in time will cause serious deformation of the surrounding rock or even collapse and damage. Therefore, in order to maintain the stability of the surrounding rock, it is necessar...

AI Technical Summary

Problems solved by technology

[0005] 1. The size is too small to realize a 1:1 large-scale test or a large-scale simulation test. It is necessary to reduce the support frame used on site according to a certain scale and process a special arch frame for the test. The test cannot be carried out directly, which makes the test process More complex, lower test accuracy, and higher cost

[0006] 2. The model device can only meet the arch test of one shape, and cannot meet the requirements of diversified arch shapes;

[0007] 3. The size of the arch frame that can be tested by the model test device has fixed requirements and cannot be changed at will, let alone directly test the arch frame used on site;

[0008] 4. Most of the loading systems cannot achieve the effect of flexible loading, so that the force transmission pressure head forms a rigid contact with the surface of the arch, and even produces line contact or point contact after deformation, causing the arch to fail due to stress concentration. Accuracy has a big impact

[0009] Generally speaking, for the increasingly complex underground projects such as deep or soft rock roadways, tunnels, chambers, etc., there are still some problems in the existing test bench device system, which cannot realize large size, different shapes, high load, hydraulic pressure, etc. Due to the characteristics of high measurement and control precision and accurate monitoring and acquisition, a new type of combined adjustable constrained concrete arch large-scale mechanical test system is needed to solve the above problems

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