摘要
岩土工程现场及室内模型试验中常用刚性土压力盒测量土压力,但传统刚性土压力盒(SPC)由于隔膜下陷、"嵌入"效应、不能完全贴合测量表面、需要较大的埋设空间等自身局限性,在测量例如桩或埋地管道等弯曲表面土压力时并不适用。基于薄膜压力传感器(FSR)的特点设计了测量电路和标定装置,分析了标定特性,并初步探究了挠度对薄膜压力传感器(FSR)测量的影响,最后通过试验对比分析了传统刚性土压力盒(SPC)和薄膜压力传感器(FSR)测量弯曲表面土压力的性能。结果表明薄膜压力传感器(FSR)能有效避免"嵌入"效应,减小测量误差,并且安装方便。
Measuring the earth pressure with rigid soil pressure cell(SPC) is a common test method in geotechnical tests. However, the traditional rigid soil pressure cell is not suitable for measuring the earth pressures on curved surface such as piles or buried pipelines because of its limitations such as diaphragm subsidence, "embedding" effect, incomplete fitting of measuring surface and large buried space. The measurement circuit and calibration devices are designed for the characteristics of the thin film pressure sensor. The calibration characteristics are analyzed, and the influences of deflection on the measurement of the film pressure sensor are preliminarily investigated. Finally, the capabilities of the traditional rigid soil pressure cell and the thin film pressure sensor to measure the soil pressures on curved surface are compared and analyzed through experiments. The results show that the thin film pressure sensor can effectively avoid the "embedding" effect, reduce the measurement error, and is easy to install.
作者
刘开源
许成顺
贾科敏
张小玲
LIU Kai-yuan;XU Cheng-shun;JIA Ke-min;ZHANG Xiao-ling(The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2020年第3期584-591,共8页
Chinese Journal of Geotechnical Engineering
关键词
曲面土压力
土压力盒
薄膜压力传感器
挠度影响
标定特性
curved surface earth pressure
soil pressure cell
film pressure sensor
effect of deflection
calibration characteristic
