超重力离心模型试验中孔隙水压测试影响因素与标定方法

doi:10.13722/j.cnki.jrme.2021.1188

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Abstract 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.

Key words： soil mechanics dynamic centrifuge modelling pore water pressure measurement calibration method influence factor normalization

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	Articles by authors
	WANG Yongzhi1
	2
	TANG Zhaoguang1
	2
	ZHANG Xuedong3
	SUN Rui1
	2
	ZHANG Yuting4

Cite this article:

WANG Yongzhi1,2,TANG Zhaoguang1, et al. Calibration method and reliability evaluation of pore water pressure measurement in dynamic centrifuge modelling[J]. , 2022, 41(S2): 3433-3443.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1188 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3433

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