Indoor test model for frost heaving force of tunnels in cold regions and testing method thereof

Abstract

The invention relates to the technical field of indoor model test and particularly relates to an indoor test model for the frost heaving force of tunnels in cold regions and a testing method thereof. The indoor test model comprises a model box, a cold bath system and a data acquisition system used for acquiring monitoring data, wherein the model box is internally filled with a simulation surrounding rock which is internally provided with a simulation secondary lining; the cold bath system is arranged in the secondary lining; the data acquisition system comprises a plurality of sensors and a data acquisition box connected with the sensors; the model box comprises a framework structure and toughened glass arranged on a framework; in the simulation space of the framework structure, the simulation surrounding rock and the simulation secondary lining can be used for repeatedly testing for simulating different work conditions; due to the arrangement of the cold bath system, the environment temperatures of different actual work conditions can be simulated, and the data acquisition system is used for acquiring monitoring data, thus facilitating the analysis in later stage. According to the invention, the structure is accurate, the construction is convenient, and the distribution rules of the frost heaving forces in the tunnels in the cold regions under different work conditions can be measured, thus providing basis for the design of the tunnels in the cold regions.

Description

technical field [0001] The invention relates to the technical field of indoor model tests, in particular to an indoor test model for testing frost-heaving force of tunnels in cold regions and a testing method thereof. Background technique [0002] The implementation of the western development strategy has made the transportation industry in the western region vigorously developed, and more and more tunnels in cold regions have been put into construction and operation. However, statistical data show that most of the completed tunnels in cold regions are subjected to frost heaving force, resulting in lining cracks, water leakage, peeling and brittle, icing on the road surface and other diseases, which seriously threaten the operation safety of the tunnels. Some tunnels in cold regions even suffer perennial damage due to freezing Therefore, it is of great significance to find out the temperature field and the size and distribution of frost heaving force of tunnels in cold regio...

AI Technical Summary

Problems solved by technology

However, statistical data show that most of the completed tunnels in cold regions are subjected to frost heaving force, resulting in lining cracks, water leakage, peeling and brittle, icing on the road surface and other diseases, which seriously threaten the operation safety of the tunnels. Some tunnels in cold regions even suffer perennial damage due to freezing Therefore, it is of great significance to find out the temperature field and the size and distribution of frost heaving force of tunnels in cold regions, and it is of great significance for the prevention and treatment of tunnel frost damage in cold regions. However, due to the complexity of tunnel surrounding rocks and the variability of ambient temperature, It is difficult to accurately obtain the size and distribution of frost heaving force in different tunnels. For a long time, the frost heaving force of tunnels in cold regions has always been a difficulty that plagues engineers and technicians

At present, scholars have adopted a variety of methods to study the frost heave force. For example, some scholars use finite element software to numerically simulate the distribution of frost heave force under different working conditions, but there is uncertainty in the value of the parameters in the numerical simulation. And most of them are idealized working conditions, and there may be some errors with the actual tunnel frost heave force; some scholars use the method of field test to measure the frost heave force, for example, the patent application number 201410712858.0 gives a frost heave The results obtained by the on-site force test system are the most authentic, but the surrounding rock conditions and temperature changes of each tunnel are different, and the test results obtained can only represent the distribution law of the frost heave force of this tunnel. There are certain limitations. In addition, on-site testing requires a lot of manpower, material and financial resources, and a special person is always required to be in charge during the testing process. The amount of engineering is huge, and the economical practicability is average.

At present, there is no effective method to study the temperature field and frost heaving force distribution of tunnels in cold regions.

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