A settlement distribution monitoring system and monitoring method based on continuous fiber composite profiles

Abstract

The invention discloses a continuous fiber composite profile based settlement distribution monitoring system and a method. The monitoring system includes a sub-region measurement station, a settlement calculation module and a monitoring control center. The sub-region measurement station is composed of longitudinal positioning rods and level sensing rods. Each of the longitudinal positioning rods consists of an in-soil anchoring section, a joint part connected to the level sensing rods outside the soil, and soil surface anchoring piece. Both sides of the joints are connected to the level sensing rods through hinging and fixed connection respectively, and a strain sensing unit is implanted into each level sensing rod along the axial direction. And each sub-region measurement station is connected to the settlement calculation module and the monitoring control center through data transmission lines. The system and the method provided by the invention have the characteristics of convenient construction and low cost, and can be widely applied in the field of measurement and connection monitoring of tunnels, inclined landside bodies, long-distance track foundations and other huge buildings and geotechnical engineerings' vertical settlement displacement.

Description

technical field [0001] The invention relates to a technology for health detection and monitoring in civil traffic structures, in particular to a real-time remote monitoring system suitable for large-scale settlement distribution of long-distance linear structures such as railways, highways, and tunnels. Background technique [0002] Subsidence monitoring is an important detection and monitoring content in railways, highways and tunnels, and is related to the operation and management of normal transportation. In addition, in order to evaluate and predict the damage and development process of settlement, it is necessary to grasp the change of soil layer settlement in each section of the subgrade along each route of the traffic line. At present, the multi-layer settlement monitoring in the subgrade generally adopts the single-point settlement meter arranged in sections, and the single-point settlement meter is fixed within the depth range of the soil to be measured, and the set...

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Problems solved by technology

The design of equal-strength cantilever beams needs to change the section size correspondingly with the magnitude of the bending moment. In long-distance monitoring, it is necessary to have enough end width to ensure the accuracy of the measurement. In addition, the two ends of the cantilever are prone to torsion problems during the force transmission process, so it is difficult to Practical application in large-scale settlement monitoring of long-distance linear structures

In addition, point-type sensing elements such as optical fiber gratings are only suitable for responding to local strain changes of force-transmitting components. During long-term monitoring, errors caused by inhomogeneous materials and the influence of the external environment will be amplified during the calculation process, resulting in a decrease in the accuracy of settlement calculations. question

In addition, since the strain sensing elements with small diameters such as optical fibers are only suitable for measuring tensile strain, sufficient pre-tension should be provided in advance for compression measurement.

It is difficult to guarantee the measurement accuracy of compression deformation for point-type optical fiber sensing elements

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