Loess subway tunnel surrounding rock immersion and dynamic load simulation system and test method

Abstract

The invention discloses a loess subway tunnel surrounding rock immersion and dynamic load simulation system and a test method. The system is characterized in that through setting a tunnel model in a model box and setting a water immersion head at the bottom of the model box, the tunnel immersion condition is simulated, an electric vibration exciter is set in the tunnel model to simulate tunnel vibration, the electric vibration exciter can slide on the track and can simulate vibration at different positions, the system is free and flexible, the system realizes simulation under different conditions of subway tunnel immersion and dynamic load, and simulation requirements of immersion and dynamic load of the test are fully met. The system has advantages of clear structure, excellent functions,high automation degree, repeatable utilization and excellent popularization and application values.

Description

technical field [0001] The invention belongs to the field of indoor model tests, in particular to a simulation system and test method for surrounding rock immersion and dynamic load of loess subway tunnels. Background technique [0002] With the continuous improvement of my country's urban transportation network, more and more subway tunnels have been put into construction and operation. Large-thick loess strata are widely distributed in western cities such as Xi'an and Lanzhou. With the further improvement of subway lines, it is inevitable that there will be many subway sections in large-thickness collapsible loess strata. Loess has obvious water sensitivity. Changes in the water content of loess strata will cause significant changes in its mechanical parameters, which will pose a threat to the engineering structure in it. At present, a large number of underground engineering constructions will cause changes in groundwater levels. In addition, water pipelines burst and leak...

AI Technical Summary

Problems solved by technology

Loess has obvious water sensitivity. Changes in the water content of loess strata will cause significant changes in its mechanical parameters, which will pose a threat to the engineering structure in it. At present, a large number of underground engineering constructions will cause changes in groundwater levels. In addition, water pipelines burst and leak, and nearby rivers Water seepage, etc., may lead to water immersion in the surrounding rock of the tunnel. Under the dynamic load of the train, the bearing capacity of the surrounding rock may be reduced, causing lining cracks and water leakage, and other diseases, which pose a threat to the safety of the subway tunnel structure.

In order to systematically study the influence of water immersion in the loess strata and the dynamic load of the train on the tunnel structure, numerical simulation, indoor model test, theoretical analysis and other methods are often used for research. less, this is due to the limitations of the current indoor model device, it is difficult to achieve a good simulation effect

For example, the patent "A Simulation Test Model Box and Test Method for Multiple Immersion Conditions" (Application No.: 201710057182.X) provides a multi-condition immersion test model box, which can simulate some strata immersion conditions, but does not involve train dynamics. Influenced by load, and water immersion can only simulate working conditions such as groundwater rise and surface water seepage, but cannot simulate local water seepage such as underground pipeline bursts, and some actual water immersion conditions and train dynamic loads are difficult to simulate well

And due to the limitations of the test system, the current indoor test model method under the influence of loess stratum immersion and dynamic load is not mature.

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