Surrounding rock pressure-frost heaving force monitoring system for tunnel in cold region and mounting method thereof

Abstract

The invention belongs to the technical field of monitoring of tunnels, and specifically relates to a surrounding rock pressure-frost heaving force monitoring system for a tunnel in a cold region and a mounting structure of the monitoring system. The system comprises a plurality of sensor modules which are arranged on a testing section to measure real-time data, a plurality of data acquiring modules which are arranged on each testing section to acquire the data of the sensor modules, data processing module for collecting and processing the data acquired by the data acquiring modules, a central control module for controlling the working states of the data acquiring modules and the data processing modules, and a data display module for displaying the data acquired by the data acquiring modules; the data acquiring modules are respectively connected with the sensor modules and the data processing module; the data processing module is respectively connected with the central control module and the data display module. The monitoring system has the advantages that the gradations are distinct, all testing sections are connected in parallel for working, and the damage of some testing section does not influence the work on other testing sections, so that the practicability is high; in addition, the testing data are complete and reliable, the data processing is simple and clear, the data continuity is high, and therefore, the analysis can be conveniently carried out.

Description

technical field [0001] The invention belongs to the technical field of tunnel monitoring, and in particular relates to a tunnel surrounding rock pressure-frost heave force monitoring system in a cold region and an installation method thereof. Background technique [0002] With the implementation of my country's western development strategy, more and more road tunnels have begun to be built. The western part of my country is dominated by plateau landforms with high altitude and low temperature. It is inevitable that many high-altitude cold air tunnels will be put into construction and operation. The main feature of tunnels in cold regions is the "freeze-thaw" cycle. With the change of seasonal temperature, the surrounding rock of the tunnel will be affected. In winter, the surrounding rock will be affected by the low temperature climate to produce a new frozen circle, and the surrounding rock has a great effect on the lining. In summer, when the temperature warms up, the frost ...

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Problems solved by technology

However, the code does not give specific calculation methods and formulas for tunnels in cold regions, indicating that the frost heaving force is affected by various factors, and it is difficult to obtain its theoretical calculation value, which brings great difficulties to the practical application of the project.

At present, the research on the frost heaving force value of tunnels in cold regions is limited to theoretical semi-empirical calculations. Some scholars have proposed many empirical formulas, but these semi-empirical calculation formulas have very limited application, too many control conditions, and the accuracy of calculation results is also low. It is debatable; some scholars have carried out some on-site testing work, but the instruments and testing methods used are not systematic, and the testing work usually requires the cooperation of technical personnel from the instrument manufacturer. This has caused a considerable disconnect, making it often difficult to carry out on-site tests, and the test results are not satisfactory even after the tests are completed. In addition, the current on-site tests are carried out by burying earth pressure cells to obtain surrounding rock and The contact pressure between the primary branch, the primary branch and the secondary lining is regarded as the frost heaving force of the tunnel in the cold region, but the fact is that when the frozen circle exists, the frost heaving force and the surrounding rock pressure act together on the primary branch and the secondary lining. Two linings, the two are mixed together and it is difficult to distinguish, therefore, the accuracy of the test results obtained is also greatly reduced

Generally speaking, there is currently no test system for surrounding rock pressure-frost heaving force of tunnels in cold regions. The construction and operation of a large number of tunnels in cold regions makes it a challenge to invent a test system for surrounding rock pressure and frost heaving force of tunnels in cold regions. Problems to be solved

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