Method for obtaining tunnel damping layer material

Abstract

The invention relates to a tunnel damping layer material obtaining method. The method comprises the following steps that a surrounding rock similar material and a lining similar material are prepared according to a predetermined geometric similarity ratio, a predetermined density similarity ratio and a predetermined stress similarity ratio; preparing a surrounding rock model by utilizing the prepared surrounding rock similar material, preparing a lining model by utilizing the prepared lining similar material, preparing a plurality of samples by utilizing the surrounding rock model, the lining model and a damping layer, and preparing damping layer materials of different samples; strain monitoring elements are installed at the set positions, at the cross section of the lining model, of the samples, the samples are sequentially placed into the model box, set loads are applied to the samples till target samples with the stress and the strain of the lining model within the set range are obtained, and the damping layer material in actual engineering is determined according to the stress similarity ratio and the damping layer material of the target samples. The method disclosed by the invention is simple to operate and low in cost.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering testing, in particular to a method for obtaining materials for a shock-absorbing layer of a tunnel. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Tunnels (caves) widely exist in highways, railways, municipal, hydropower and other projects, and play an important role in transportation, water delivery, electric power, communications and other fields. However, a large number of tunnels have been damaged during several strong earthquakes in the past, causing serious losses. Earthquakes seriously threaten the safe operation of tunnels in high-intensity areas. Scientific anti-seismic design and effective anti-seismic measures are effective ways to reduce tunnel earthquake damage. [0004] At present, the anti-seismic measures for tunnels can be divided int...

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Problems solved by technology

[0005] Aiming at the seismic response law and seismic design of tunnels, many model tests are carried out at present, which are shaking table model tests and centrifuge model tests. The best shock-absorbing layer material parameters are obtained through the shaking table model tests and centrifuge model tests. The inventor It was found that both model tests required professional test equipment, which made it impossible for most laboratories to carry out; at the same time, the dynamic similarity ratio of the two model tests was difficult to fully satisfy, and the test process was complicated, the test cost was high, and the test was difficult to repeat many times

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