Three-dimensional net-type monitoring system and method for underwater landslide deformation

Patent metadata

Field	Value
Publication number	US-11536861-B2
Application number	US-202117367589-A
Country	US
Kind code	B2
Filing date	Jul 5, 2021
Priority date	May 14, 2021
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A plurality of multifunctional underwater 3D displacement meters are arranged in a lattice and connected sequentially; four rotation shafts may be rotatably mounted in a housing and extend in a vertical direction, one end of the rotation shaft and the housing are connected to a compressible spring, four perforations penetrate the housing in a circumferential direction at intervals, the metallic lines correspond to the perforations one to one, one end of the metallic line is wound around the rotation shaft, and the other end thereof penetrates out of the perforation and is connected to the metallic line of the adjacent 3D displacement meter; and the displacement meter corresponds to the metallic line for measuring a take-up and pay-off length of the metallic line, and a three-axis acceleration sensor and a fluxgate monitor inclination angle change and azimuth angle change of the 3D displacement meter.

First claim

What is claimed is:

1. A three-dimensional (3D) net-type monitoring system for underwater landslide deformation, comprising a plurality of overwater monitoring stations and a plurality of multifunctional underwater 3D displacement meters;
wherein the plurality of multifunctional underwater 3D displacement meters are arranged in a lattice, connected sequentially, and fixed to a surface of an overwater sliding mass and a surface of an underwater sliding mass, each of the overwater monitoring stations is fixedly connected to one multifunctional underwater 3D displacement meter on the surface of the overwater sliding mass, at least three multifunctional underwater 3D displacement meters are located on the surface of the overwater sliding mass and located on different straight lines, and a global positioning system (GPS) device is arranged on the overwater monitoring station and is used for acquiring spatial positions of the multifunctional underwater 3D displacement meters on the surface of the overwater sliding mass;
the multifunctional underwater 3D displacement meter comprises a housing, four rotation shafts, four metallic lines, four displacement meters and a sensor assembly; the four rotation shafts are rotatably mounted in the housing and extend in a vertical direction, one end of the rotation shaft and the housing are connected to a compressible spring, four perforations penetrate the housing in a circumferential direction at intervals, the metallic lines correspond to the perforations in a one-to-one manner, one end of the metallic line is wound around the rotation shaft, and the other end thereof penetrates out of the perforation and is connected to the metallic line of the adjacent multifunctional underwater 3D displacement meter; and the displacement meters are fixed in the housing, and each displacement meter corresponds to the metallic line for measuring a take-up and pay-off length of the metallic line; and the sensor assembly comprises a three-axis acceleration sensor and a fluxgate, the three-axis acceleration sensor and the fluxgate being fixed in the housing and used for monitoring inclination angle change and azimuth angle change of the multifunctional underwater 3D displacement meter respectively.

2. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 1 , wherein the displacement meter comprises a light-emitting element, a photosensitive element and optical grating discs, each grating disc being coaxially fixed on each rotation shaft, the rotation shaft rotating to drive the optical grating disc to rotate, the light-emitting element and the photosensitive element being located on an upper side and a lower side of the optical grating disc respectively and fixed in the housing, and the photosensitive element being used for acquiring a rotation distance of the optical grating disc so as to acquire the take-up and pay-off length of the metallic line.

3. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 2 , wherein a partition plate is arranged in the housing to form a displacement meter cavity and a sensor cavity one above the other, the displacement meter being located in the displacement meter cavity, and the sensor assembly being located in the sensor cavity.

4. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 3 , wherein the light-emitting element is located in the displacement meter cavity, the photosensitive element is located in the sensor cavity, and a light hole penetrates a position, opposite the light-emitting element, of the partition plate.

5. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 1 , wherein a hub is fixed on the rotation shaft, and one end of the metallic line is wound around the hub.

6. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 1 , wherein a groove is provided in a position, opposite the rotation shaft, of the housing, the rotation shaft is mounted in the groove, and the rotation shaft and at least one groove are internally connected to the compressible spring.

7. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 1 , wherein the sensor assembly further comprises a water temperature sensor located in the housing for monitoring water temperature, and further comprises a micro camera, a transparent monitoring window is arranged on a side wall of the sensor cavity, and the micro camera is fixed to an inner side of the transparent monitoring window and used for observing an erosion state of the underwater sliding mass.

8. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 7 , wherein an integrated circuit board is fixed in the housing, the integrated circuit board being electrically connected to a water temperature sensor, a three-axis acceleration sensor, a fluxgate, a displacement meter, a micro camera and a photosensitive element for collecting, processing and transmitting monitoring data.

9. The three-dimensional net-type monitoring system for underwater landslide deformation according to claim 8 , wherein the overwater monitoring station is provided with a solar power supply device, and the solar power supply device is electrically connected to all apparatuses in the multifunctional underwater 3D displacement meter and supplying power continuously in a monitoring process; and/or,
the overwater monitoring station is provided with a communication module, a data transceiver is fixed in the housing, the data transceiver is electrically connected to the integrated circuit board and is in communication connection with the communication module, and the communication module is used for acquiring monitoring information of the multifunctional underwater 3D displacement meter and sending the monitoring information to a mobile monitoring terminal or a network by means of general packet radio service (GPRS).

10. A monitoring method using the three-dimensional net-type monitoring system for underwater landslide deformation according to claim 1 , comprising the following steps:
S 1 , determining, on the basis of early-stage exploration, a position of a landslide to be monitored, and determining a specific monitoring position of the landslide through paying off;
S 2 , numbering multifunctional underwater 3D displacement meters, then connecting the multifunctional underwater 3D displacement meters in a latticed manner by a metallic line to form a net, and arranging the multifunctional underwater 3D displacement meters on a surface of an overwater sliding mass and a surface of an underwater sliding mass, wherein at least three multifunctional underwater 3D displacement meters which are located on different straight lines are reserved on the surface of the overwater sliding mass during arrangement;
S 3 , connecting an overwater monitoring station to the multifunctional underwater 3D displacement meter on the surface of the overwater sliding mass fixedly; and
S 4 , after energization, acquiring position data of each overwater monitoring station by a GPS apparatus of the overwater monitoring station, monitoring inclination angle change of each of the multifunctional underwater 3D displacement meters by a three-axis acceleration sensor, and monitoring azimuth angle change of each of the multifunctional underwater 3D displacement meters by a fluxgate, so as to monitor change of a single-node spatial attitude, and acquiring a take-up and pay-off length of a metallic line by a displacement meter, so as to calculate a distance between tw

Assignees

• Univ China Geosciences Wuhan

Inventors

• Zhang Junrong
• Tang Huiming
• Zhang Yongquan
• Li Changdong
• Zhang Qing
• Ma Junwei
• Xia Ding
• Lin Chengyuan
• Lu Sha

Classifications

• H04W4/90

  Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] · CPC title

• H04W4/02

  Services making use of location information · CPC title

• G08B31/00

  Predictive alarm systems characterised by extrapolation or other computation using updated historic data · CPC title

• G08B21/10 Primary

  responsive to calamitous events, e.g. tornados or earthquakes · CPC title

• G01V1/003

  Seismic data acquisition in general, e.g. survey design (G01V1/3808, G01V1/42 take precedence) · CPC title