Device and method for monitoring differential settlement in portfolio for soil-stone combined region with hydraulic structure

Abstract

The invention discloses a device and a method for monitoring differential settlement in portfolio for a soil-stone combined region with a hydraulic structure. The device comprises a bottom-through shaft and an inner carrying tube positioned inside the bottom-through shaft, wherein a displacement station is arranged in the inner carrying tube; drill driving devices are symmetrically arranged on two sides of the displacement station, and are connected with conical drills; the drill driving devices on two sides are respectively connected with lifting devices which are used for promoting motion of the drill driving devices; correcting devices which are used for correcting level of the displacement station are symmetrically arranged at two ends of the displacement station; the middle part of the displacement station is connected with one end of a group of symmetrically arranged springs, and the other end of each spring is hinged with a vertical measuring tape; an optical fiber hanging drum is arranged between two springs, and is filled with a corrugated loop optical fiber; and an optical fiber buckle is arranged on the corrugated loop optical fiber. The device has the advantages of use repeatability, convenience in assembly, real-time detection and maintenance and the like, and has the characteristics of distribution type, micro-macro structure, real-time performance, high adaptability to complex environment and the like.

Description

technical field [0001] The invention relates to a monitoring method of a combination monitoring device for uneven settlement in an earth-rock combination area of ​​a hydraulic structure, which belongs to the field of construction. Background technique [0002] The soil-rock bonded areas in hydraulic structures such as embankments and sluices often have uneven settlement during operation, which has adverse effects on the safety and normal use of buildings, and even leads to building damage or accidents. By arranging monitoring instruments or devices in the soil-rock combination area, real-time acquisition of regional settlement information, reasonable analysis of the spatial and temporal variation of regional settlement, timely detection of abnormal conditions of regional settlement (especially uneven settlement), and scientifically taking preventive or control measures, It is of great significance to ensure the safe service of hydraulic structures. [0003] At present, conv...

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Problems solved by technology

[0003] At present, conventional settlement monitoring devices have many shortcomings such as difficult construction and layout, low reusability, difficult maintenance, poor durability, low precision, and susceptibility to electromagnetic environment interference.

Optical fiber sensors have the characteristics of radiation resistance and corrosion resistance, and have obvious advantages in the monitoring of uneven settlement diseases; but from the current situation of optical fiber deformation monitoring, distributed real-time monitoring methods are current research and application hotspots, but the technology itself and engineering The practicability is not yet mature, especially for the application of optical fiber loops for settlement monitoring.

By using the changes of Rayleigh scattering, Fresnel reflection and Brillouin scattering in the optical fiber, not only can the uneven settlement disease be accurately located theoretically, but also a quantitative description of the uneven settlement disease can be given; but in the process of realizing the above goals, The layout of the optical fiber is extremely delicate, especially the circuit setting is even more difficult

From the perspective of the latest optical fiber technology field, the ODiSI (Optical Distributed Sensor Interrogator) distributed optical fiber sensing system of Luna Technology Company in the United States can achieve mm-level spatial resolution, but the maximum sensing length is only 50m, and it is affected by many factors in practical applications. Interference, the effective monitoring length and resolution will be reduced; the photonometer produced by Japan NBX company using PPP-BOTDA technology can improve the effective spatial resolution to cm level, but it needs the layout of optical fiber loops, making it difficult to be directly applied in practice Uneven Settlement Monitoring of Engineering

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