岩土工程学报2024，Vol.46Issue(8)：1655-1664,10.DOI:10.11779/CJGE20230642
岩土离心模型试验软接触式微型土压计研制及性能评价
Development and performance evaluation of a soft-contact earth pressure transducer for geotechnical centrifuge modeling
摘要
Abstract
The miniature earth pressure transducer is one of the key testing tools in geotechnical centrifuge modeling.Aiming at solving the classical problems such as arching effects,size effects and thickness-diameter ratio in the measurement of rigid transducers,and improving the frequency response rate and induction accuracy,a soft-contact pressure transducer ESP-II is developed,and its innovations and design methods are introduced.Taking two internationally representative earth pressure transducers as reference,a series of centrifugal model tests are designed and carried out to evaluate its accuracy,frequency response and applicability.The main conclusions are as follows:(1)In the static centrifugal acceleration tests spinning up from 5g to 50g,the difference between the theoretical values and the test results of ESP-II and the two reference transducers at each depth is small,and the average deviations are 5.16%,6.70%and 4.85%,respectively.The coefficient R2 of the three curves K0 fitted along the depth is≥0.9893.(2)In the pulse load tests,the maximum response time of ESP-II is about 7.8 ms,which is slightly better than that of the two reference transducers and has a satisfactory frequency response.(3)In the dynamic load tests of sine and seismic with different amplitudes,the incremental trend of earth pressure measured by the three transducers is basically consistent.The variation range of K0 increases from 0.43～0.45 before the seismic to 0.51～0.56 after the seismic,which is consistent with the existing theory.(4)At the decelerating stage of the centrifuge,the good continuity and smoothness of the time history measured by the ESP-II,which reflects the soft-contact design,is conducive to ensuring good contact and stable response between the soil and the transducer.The research results have preliminarily proved that the developed soft-contact transducer ESP-II satisfies the requirements of static and dynamic centrifugal tests,with significant application value and immense potential.关键词
岩土离心模型试验/微型土压计/设计方法/软接触式/性能评价Key words
geotechnical centrifuge modeling/miniature earth pressure transducer/design method/soft-contact type/performance evaluation分类
建筑与水利引用本文复制引用
王永志,杨阳,徐光明,汤兆光,张雪东,孙锐,周燕国..岩土离心模型试验软接触式微型土压计研制及性能评价[J].岩土工程学报,2024,46(8):1655-1664,10.基金项目
中国地震局工程力学研究所基本科研业务费专项项目(2023B08) （2023B08）
国家自然科学基金项目(52278374,519786131) （52278374,519786131）
黑龙江省自然科学基金项目(LH2023E019) （LH2023E019）
