工程地质学报2018，Vol.26Issue(6)：1439-1446,8.DOI:10.13544/j.cnki.jeg.2017-388
基于光纤光栅的土体含水率快速测定试验研究
EXPERIMENTAL STUDY ON RAPID DETERMINATION OF SOIL MOISTURE CONTENT BASED ON FIBER BRAGG GRATING TECHNIQUE
摘要
Abstract
Soil moisture content has a great influence on the strength, deformation and permeability of soils. How to measure soil moisture content rapidly is an important subject in foundation engineering. Aiming at the problems such as poor real-time ability in existing measurements, a new method based on fiber Bragg grating (FBG) technique for rapid determination of soil moisture content is proposed in this paper. By using free-fall balls, impact loads are applied to FBG strain sensors embedded in sandy soil. The strains and their variation of sensors in this process are measured. Based on the analysis of the variation of strain, the concept of peak strain is introduced. By controlling variable method, an indoor test on sandy soil is carried out under the condition of different moisture contents. The experimental results show that peak strain decreases with increasing of moisture content. There is a nearly linear relationship between the moisture content and the peak strain. Therefore, soil moisture content can be estimated by an empirical calculation formula. The possible errors in the method are analyzed, and the methods for reducing errors are given.关键词
含水率/光纤光栅(FBG)/落球试验/现场测定Key words
Moisture content/Fiber Bragg grating (FBG)/Falling ball test/Field measurement分类
建筑与水利引用本文复制引用
周谷宇,朱鸿鹄,朱宝,张诚成,施斌..基于光纤光栅的土体含水率快速测定试验研究[J].工程地质学报,2018,26(6):1439-1446,8.基金项目
国家自然科学基金面上项目(41672277) （41672277）
江苏省自然科学基金面上项目(BK20161238) （BK20161238）
苏州市科技计划项目(SYG201612)资助. （SYG201612）
