Calibration method and reliability evaluation of pore water pressure measurement in dynamic centrifuge modelling

被引：0
|
作者：
Wang Y. [1 ,2 ]
Tang Z. [1 ,2 ]
Zhang X. [3 ]
Sun R. [1 ,2 ]
Zhang Y. [4 ]
机构：
[1] Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Heilongjiang, Harbin
[2] Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Heilongjiang, Harbin
[3] State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing
[4] Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷
基金：
黑龙江省自然科学基金; 中国国家自然科学基金;
关键词：
calibration method; dynamic centrifuge modelling; influence factor; normalization; pore water pressure measurement; soil mechanics;
D O I：
10.13722/j.cnki.jrme.2021.1188
中图分类号：
学科分类号：
摘要：
Miniature pore water pressure transducer is one of crucial testing techniques in geotechnical engineering monitoring and physical model test. With centrifuge model test featured by factors of centrifugal acceleration，viscous liquid and high frequency vibration，influences of these factors on miniature pore water pressure measurement are worth to explore and understand. A set of centrifuge tests consisting of dry sand，saturated sand and pure liquid models are carried out to calibrate the measuring reliability of pore water pressure transducers by varying a single state parameter in the tests，the response characteristics and measurement error of three typical miniature transducers are revealed and analyzed. The results show that as increasing centrifuge acceleration，amplitudes of all transducers in the dry sand model present distinct increasing or decreasing trends independent of their buried depths. However，as centrifuge accelerations less than 50 g，all variations of the amplitudes are less than 1.0 kPa，indicating that the influence of the centrifuge accelerations is negligible. With viscosity coefficient ranging from 1cst to100cst，response time and dynamic resolution of the transducers are both impaired. For the transducers of 2Mie，DSP–II and HC–25，the response time grows from 4.92，4.98 and 10.75 ms to 13.42，13.15 and 20.01 ms，while their dynamic resolutions weaken from 54，59 and 121 Pa to 109，113 and 213 Pa. Such influence are worthy of taking into account for the study of liquefaction threshold and pore water pressure increment relation. The influence of transducer placement directions on pore pressure measurement in the saturated model test is noticeable. The pore water pressure ratios of the transducers placed parallel to the shaking direction exhibit unexpectedly remarkable oscillation with the magnitudes varying from 0.78 to 1.02. Simultaneously，the pore water pressure ratios of the transducers placed vertically arise considerable values between 1.04 and 1.20. The influences arisen in parallel and vertical placement are likely attributed to the disturbances of dynamic cyclic shear stress and excess pressure-induced pore water seepage respectively. The intensive electromagnetic interference on the transducer responses appears inconsiderable. The calibration method and results provide important guidance and dataset for the development pore water pressure measurement techniques and the revision of specifications for dynamic centrifuge model tests. © 2022 Academia Sinica. All rights reserved.
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页码：3433 / 3443
页数：10
相关论文
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