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Distributive optical fiber detecting method and system for prefabricated pile damage

A technology of distributed optical fiber and detection method, which is applied in the direction of using optical devices to transmit sensing components, testing of basic structures, construction, etc.

Inactive Publication Date: 2007-01-24
NANJING UNIV
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  • Abstract
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Problems solved by technology

[0007] There is no Brillouin scattered light time-domain reflectometry method for distributed optical fiber detection of prefabricated pile damage

Method used

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  • Distributive optical fiber detecting method and system for prefabricated pile damage
  • Distributive optical fiber detecting method and system for prefabricated pile damage
  • Distributive optical fiber detecting method and system for prefabricated pile damage

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and the examples completed according to the technical solutions of the present invention, and the present invention is not limited to these examples.

[0018] The present invention is a prefabricated pile penetration process damage distributed optical fiber detection method and system, including the following implementation steps:

[0019] Two sensing optical fibers are arranged in parallel along the grooves on the surface of the foundation pile to be tested, one is a tight sleeve optical fiber, and the other is a loose sleeve optical fiber, and the strain and temperature of the outer surface of the foundation pile to be tested are measured respectively;

[0020] Use BOTDR to measure the strain distribution and temperature distribution of the sensing fiber, and obtain the strain distribution on the surface of the foundation pile to be tested. The BOTDR instrumen...

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Abstract

The method sets up sensing optical fiber on surface of prefabricated foundation pile to be measured. Both dependent variable and temperature sensed of the fiber are based on Brillouin backscattering. At incidence end of pulsed light, the method measures received light power of Brillouin backscattering so as to accomplish function of measuring and positioning Brillouin frequency shift on each points of optical fiber. In procedure of sinking pile, strain distribution is as basic parameter to reflect impaired character and degree of foundation pile. Based on linear correlation between Brillouin frequency shift and strain, temperature, the method carries out temperature compensation based on measured strain distribution and temperature distribution so as to obtain actual strain distribution on surface of foundation pile to be measured.

Description

1. Technical field [0001] The invention belongs to the technical field of geotechnical engineering detection, and relates to a detection method and a detection system for prefabricated pile damage based on distributed optical fiber sensing technology. 2. Background technology [0002] Prefabricated piles are one of the commonly used forms of deep foundations in construction, transportation, water conservancy and other industries in my country. Usually, prefabricated piles need to be piled under pressure, which currently mainly includes two construction methods: hammering method and static pressure method. Due to the local stress concentration in the process of pressure pile penetration and the ubiquity of unfavorable geological conditions such as boulders, hard strata, soft and hard abrupt strata, etc., it often leads to foundation pile damage such as broken piles and local damage, which affects the pile foundation and superstructure. safety and durability. [0003] Existi...

Claims

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Application Information

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IPC IPC(8): E02D33/00G01D5/353
Inventor 施斌张巍王宝军索文斌王小明刘杰刘春隋海波朱友群魏广庆李科陈峰军张丹朴春德
Owner NANJING UNIV
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