Deep foundation pit deformation distribution type monitoring system based on OFDR technology

Abstract

The invention discloses a deep foundation pit deformation distribution type monitoring system based on an OFDR technology. The monitoring system comprises three optical fiber devices, namely a distribution type optical fiber inclinometer pipe, a distribution type optical fiber axial force meter and a distribution type optical fiber water level gauge, and three subsystems, namely an optical fiber data acquisition and transmission system, an optical fiber data processing and analysis system and a monitoring result display system. After all parts of optical fibers are distributed, the adjacent optical fibers are sequentially connected, forming a deep foundation pit deformation distribution type monitoring network. When data is acquired, as long as an optical fiber terminal is connected to anOBR data acquisition unit, the strain and temperature variation data of all monitored targets can be obtained by one acquisition. Then, the data is automatically processed by an OBR data processing system, the deformation, axial force and position information of the corresponding targets are obtained, and the information is displayed in the display system in a visual form, such as a chart. The method has the advantages of high precision, high efficiency, wide range, simple operation and the like.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering monitoring, and in particular relates to a distributed monitoring system for deep foundation pit deformation based on OFDR technology. Background technique [0002] With the construction of a large number of high-rise buildings and underground infrastructure, the number of foundation pits continues to increase and the scale continues to expand. How to effectively monitor the deformation of foundation pits during construction and ensure the safety and stability of foundation pits has become the focus of attention and research hotspots in the engineering community. The horizontal displacement of the deep soil in the foundation pit, the groundwater level, and the supporting axial force are the three important aspects of foundation pit monitoring. At present, the monitoring of these three items mainly uses traditional manpower and electronic equipment such as inclinometers, water level gauges, a...

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Problems solved by technology

The horizontal displacement of the deep soil in the foundation pit, the groundwater level, and the supporting axial force are the three important aspects of foundation pit monitoring. At present, the monitoring of these three items mainly uses traditional manpower and electronic equipment such as inclinometers, water level gauges, and steel axial force gauges. These methods have the following limitations and deficiencies: (1) Most of them are point-based measurements, and the data collected is limited, which is prone to missed detection and cannot fully reflect the deformation characteristics of the monitored objects; (2) The consumption of manpower is large, which not only causes The labor cost is too high, and the monitoring efficiency is low, and the human error is large; (3) Real-time monitoring cannot be achieved, and data processing mainly relies on manual processing in the later stage, and the information feedback is not timely enough, making it difficult to meet the requirements of intelligent monitoring and information construction; (4) The layout of the measuring points is cumbersome, and the survival rate of the measuring points is low, which often affects the monitoring progress; (5) The accuracy of the instrument is not high, and it is difficult to reflect the subtle changes of the monitored objects

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