Indoor simulation test device for the influence of piping on tunnels and research on grouting treatment

Abstract

The invention relates to an indoor simulation test device for studying impact of piping on a tunnel and grouting control. The indoor simulation test device comprises a model box, a tunnel lining model, a piping simulation device, a grouting simulation device, a plurality of strain gauges, a displacement gauge bracket and a plurality of displacement gauges. The tunnel lining model is of a segmented hollow aluminum tube, the piping simulation device consists of a plastic film filled with sand, and the occurrence of a piping permeation phenomenon is simulated by injecting a certain volume of water solution. The grouting simulation device consists of a grouting pipe and a grouting device which are arranged at the two ends of the piping simulation device, wherein the plurality of strain gauges cling to the outer wall of the tunnel so as to measure the strain of the tunnel; the displacement gauges are fixedly arranged on the displacement gauge bracket so as to measure a soil body at the upper part of a tunnel model and tunnel settlement. The indoor simulation test device provided by the invention aims at studying the impact of a piping phenomenon on the tunnel and grouting control, and is of great reference value for formulating a technical standard of tunnel construction safety crossing and piping phenomenon control.

Description

technical field [0001] The invention relates to a tunnel simulation test device in urban underground space development and underground construction engineering, in particular to an indoor simulation test device for research on the influence of piping on tunnels and grouting treatment. Background technique [0002] With the further development of urbanization in our country, urban underground rail transit, as the most convenient and efficient urban transportation system, has also developed rapidly, and more and more river-crossing tunnels are being constructed. In the process of tunnel construction, leakage and piping accidents often occur due to problems in joint treatment of support structures or improper precipitation. The problem of piping in tunnel construction is very serious, and it has caused very serious losses to many projects. If the cause of the accident cannot be clearly analyzed and effective measures are taken, it will not only fail to ensure the safety of the...

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Problems solved by technology

Theoretical analysis methods mainly come from engineering experience, and the empirical values ​​obtained by statistical methods cannot analyze the cause of piping from the mechanism; the stochastic model only describes a certain factor and process of piping in a macroscopic manner, and cannot fully explain the occurrence of piping. The mechanism of the numerical simulation is limited to the range of finite element simulation of seepage, the seepage is separated from the soil, and the interaction between the soil and the seepage cannot be considered; the method of on-site monitoring is affected by the size effect, boundary conditions and soil conditions , so that the monitoring results cannot accurately reflect the actual working conditions

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