Subgrade settlement monitoring system based on MEMS sensor

Abstract

The invention discloses a subgrade settlement monitoring system based on a MEMS sensor, which comprises a plurality of rigid pipes connected head-to-tail in sequence and MEMS inclination sensors fixed in each rigid pipe, adjacent rigid pipes are flexibly connected by flexible pipes At the same time, a cable splitter is provided in each flexible tube, and each MEMS inclination sensor is connected to each cable splitter through a cable branch line, and each cable splitter is connected through a cable bus. Connection, each section of rigid pipe can only rotate relative to each other without relative displacement, and each section of rigid pipe will tilt and rotate with the subgrade soil settlement, and the MEMS inclination sensor fixed in each section of rigid pipe measures the inclination angle of each section of rigid pipe The change of the measurement data is transmitted through the cable branch, the cable branch and the cable bus, so as to obtain the subgrade settlement information in the monitoring area and realize the automatic monitoring of subgrade settlement.

Description

technical field [0001] The invention relates to the technical field of roadbed settlement monitoring, in particular to a roadbed settlement monitoring system based on MEMS sensors. Background technique [0002] Transportation infrastructure such as railways and highways play an extremely important role in the country's economic and social development. Due to various reasons, some lines inevitably pass through some unfavorable geological areas. The excessive subsidence of the track will cause the track to sink and the rail surface to bend, which will affect the smoothness and stability of the line. In severe cases, it will cause train derailment and other major accidents that threaten the safety of life and property. Therefore, it is of great significance to carry out settlement monitoring on subgrades. At present, the subgrade settlement monitoring methods mainly include monitoring pile method, settlement plate method, settlement water cup method, layered settlement method,...

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Problems solved by technology

[0003] The above methods generally have certain application defects and deficiencies. The monitoring pile method can only measure the surface settlement, but cannot obtain the settlement inside the roadbed, which affects the filling construction. The manual reading method cannot realize automatic detection and remote monitoring; the settlement plate It is easy to be damaged and difficult to remedy in the soil layer, and most of them are single-point measurement, and the multi-point measurement has a great influence on each other; the sedimentation cup method has high requirements for the burial of the pipe, and the actual operation is complicated, so it is not suitable for cold regions; layered settlement The method interferes greatly with the filling construction. Evaporation or leakage will lead to a decrease in water volume, which will affect the measurement accuracy and high cost of use. The accuracy of the profile subsidence instrument is easily affected by the external environment. It must be tested in good weather to have better accuracy. , the instrument is cumbersome and inconvenient to carry, the test requires many personnel, and the displacement of a certain point cannot be measured alone; satellite radar interferometry is easily affected by obstacles and weather, and the accuracy of high-speed railway subgrade settlement monitoring is also difficult to meet the requirements

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