|Table of Contents|

Fiber Sensing Technique Based System to Measure and Invert Debris Flow Impact Force(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第06期
Page:
1009-1017
Research Field:
水资源与环境
Publishing date:

Info

Title:
Fiber Sensing Technique Based System to Measure and Invert Debris Flow Impact Force
Author(s):
XIA Man-yu1; 2;  ZHANG Shao-jie1*;  YANG Hong-juan1;  YANG Chao-ping1; 2
(1. Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
Keywords:
debris flow;  impact force;  FBG;  model experiment;  cantilever beam;  bending deformation;  slurry dynamic pressure
PACS:
P694; P642.23
DOI:
10.19814/j.jese.2021.04030
Abstract:
Flume experiments generally use piezoelectric sensors to measure debris flow impact force. The electrical signal data in the traditional measurement mode are easily affected by the impedance effect of power line. In addition, the device deformation induced by the impact force is not considered, which can influence the measurement result. To address the above issues, a system by integrating cantilever beam and FBG for measuring debris flow impact force was designed. Based on Bingham model of debris flow and the constitutive relation of cantilever beam, the inversion formula for the maximum impact force of debris flow including maximum shift value of central wavelength, elastic modulus of structral materials and flow depth was derived. The flume experiments schemes were designed according to the force-light coupling effect of the measurement system, and the impact experiment cases considering several different densities of debris flow(1.8, 1.9, 2.0 g·cm-3)were carried out. The results show that: ① These data show good regularity. The maximum shift values of FBG center wavelength are positively correlated with density of debris flow. Under the same density, the FBG center wavelength change process and debris flow impact process have the similar trend, which verifies the good adaptability between the impact force inversion model and the measurement system. ② The maximum impact force ranges from 30.75 to 74.06 kPa, and the impact force coefficient ranges from 0.92 to 1.95, which is consistent with the impact characteristics of debris flow. It is verified that the measurement system can achieve stable and reliable measurement of impact force while overcoming the defects of the traditional piezoelectric sensors.

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Last Update: 2021-11-10