Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A quasi-distributed in-situ measurement method and device for soil matrix suction based on fiber grating

A technology of matrix suction and fiber grating, applied in the direction of measuring device, phase influence characteristic measurement, heat measurement, etc., to achieve the effect of avoiding structure and composition changes, high stability, and improving spatial resolution

Active Publication Date: 2022-04-05
NANJING UNIV +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no relevant research reports on the use of this technology to determine the matric suction in unsaturated soils at home and abroad.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A quasi-distributed in-situ measurement method and device for soil matrix suction based on fiber grating
  • A quasi-distributed in-situ measurement method and device for soil matrix suction based on fiber grating
  • A quasi-distributed in-situ measurement method and device for soil matrix suction based on fiber grating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Indoor calibration experiment using the method and device of the present invention for a matrix suction sensor. Specific steps are as follows:

[0080] Step 1. Weigh the sensor rod to obtain the quality of the clay rod;

[0081] Step 2. For the same clay stick, configure different water states of the clay stick by controlling the water content, and combine the filter paper suction test method to calibrate 16 to 20 groups of matrix suction of the clay stick at different saturations, and fit the matrix suction of the clay stick The relationship with the change of water saturation is the soil-water characteristic curve of the clay stick;

[0082] Step 3. Fully mix and stabilize the manufactured and packaged matrix suction sensor with water. The matrix suction sensor is a matrix suction sensor based on fiber Bragg grating pulse heating, and is composed of a clay rod, an optical fiber, a heating resistance wire, and an optical fiber grating;

[0083] Step 4: During the dry...

Embodiment 2

[0088] The method and device of the invention are used to carry out the in-situ test of distributed measurement of soil matrix suction, and monitor the soil matrix suction of soil at different depths. The soil of a clayey soil area in Nanjing was selected as the test site.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thermal conductivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a quasi-distributed in-situ measurement method and device for soil matrix suction based on optical fiber gratings, including: a heating DC power supply, a high heat-sensitive insulating tube (built-in resistance wire and optical fiber grating), a clay rod, and an optical fiber grating solution. A computer for instrument adjustment and analysis and processing of monitoring data. Embed the fabricated and saturated matric suction sensor in the soil to be tested, connect the heating power supply to pulse the resistance wire built into the sensor after standing still, and the heat will diffuse through the high-temperature-sensitive insulating tube to the wrapping high-temperature-sensitive insulating tube. In the clay rod; the temperature change value can be obtained through the conversion of the fiber Bragg grating wavelength data collected by the fiber Bragg grating demodulator; and then the soil matrix suction corresponding to the temperature change value is obtained according to the sensor pulse heating. The invention can realize rapid, continuous, remote, high-precision and quasi-distributed soil matrix suction measurement.

Description

technical field [0001] The invention discloses a distributed in-situ measurement method and device for soil matrix suction with fiber Bragg gratings (optical fiber gratings), and relates to the technical field of soil matrix suction measurement. Background technique [0002] In unsaturated soil, the soil is composed of soil particles, water and air, that is, in addition to the pore water pressure in the soil, there is also pore air pressure. At the interface between pore water and pore air, water has surface tension. Suction in soil includes matrix suction and osmotic suction (solute suction). Due to the existence of meniscus, the pore water pressure and pore air pressure are not equal. When the pore water pressure (u_w) is less than the pore air pressure (u_a), The difference between the two (u_a-u_w) is called the matrix suction. For the vast majority of unsaturated soils, the suction exists. When it encounters sudden rainfall or flooding, it is easy to cause rapid satur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01N33/24G01K11/3206
CPCG01N21/412G01N33/24G01K11/3206
Inventor 王家琛朱鸿鹄韦超倪钰菲裴华富程刚张春新王东辉郭子奇
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com