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汤兆光, 王永志, 段雪锋, 孙锐, 王体强. 分体高频响应微型孔隙水压力传感器研制与性能评价[J]. 岩土工程学报, 2021, 43(7): 1210-1219. DOI: 10.11779/CJGE202107005
引用本文: 汤兆光, 王永志, 段雪锋, 孙锐, 王体强. 分体高频响应微型孔隙水压力传感器研制与性能评价[J]. 岩土工程学报, 2021, 43(7): 1210-1219. DOI: 10.11779/CJGE202107005
TANG Zhao-guang, WANG Yong-zhi, DUAN Xue-feng, SUN Rui, WANG Ti-qiang. Development and performance evaluation of separable high-frequency response miniature pore water pressure transducer[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(7): 1210-1219. DOI: 10.11779/CJGE202107005
Citation: TANG Zhao-guang, WANG Yong-zhi, DUAN Xue-feng, SUN Rui, WANG Ti-qiang. Development and performance evaluation of separable high-frequency response miniature pore water pressure transducer[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(7): 1210-1219. DOI: 10.11779/CJGE202107005

分体高频响应微型孔隙水压力传感器研制与性能评价

Development and performance evaluation of separable high-frequency response miniature pore water pressure transducer

  • 摘要: 孔隙水压力是岩土物理试验和原位工程监测的关键力学指标之一。针对动力离心试验高频、瞬时荷载特点与动态孔压测试需求,研发了一种分体高频响微型孔压传感器DSP-II,以国际公认标准孔压传感器PDCR-81为参考,开展多组静/动力标定试验和土工离心模型试验,验证其测试精度、频响速率和稳定性。主要结论:①DSP-II传感器在提高频响速率、测试精度、寿命周期等方面,建立了关键技术与设计方法。②动力标定试验表明DSP-II和PDCR-81传感器具有基本相同动力性能,响应时间分别为4.93 ms和4.97 ms,幅值误差为0.483%和0.575%,可满足频率≤200 Hz地震、爆炸等动力离心试验孔压测试需求。③逐级加载和39 d后重复静力离心试验,不同埋深DSP-II和PDCR-81测试结果与理论值高度吻合,平均幅值误差和重复性指标分别为0.347%和0.392%,0.157%和0.169%,表明二者具备优良的长期稳定性和一致性。④各动荷载离心试验中两种传感器的测量结果极为一致,最大峰值滞时和最小相关系数分别为1.76 ms和0.9908,证明DSP-II达到了国际标准孔压传感器的量测性能。

     

    Abstract: The pore water pressure is one of the key mechanical indexes in geotechnical model tests and in-situ engineering monitoring. Aiming at the characteristics of high frequency and instantaneous load of dynamic centrifugal model tests and the measuring requirements of dynamic pore water pressure, a novel separable high-frequency response miniature transducer DSP-II is developed. Moreover, the internationally recognized standard pore water pressure transducer PDCR-81 is selected to perform a series of static and dynamic calibration tests and centrifugal model tests to verify the accuracy, frequency response and stability performance of the DSP-II. The main conclusions are drawn: (1) The DSP-II has established key technology and design method in improving the frequency response, accuracy, life cycle, etc. (2) The dynamic calibration test results show that the response time of the DSP-II and the PDCR-81 is 4.93 and 4.97 ms, and the amplitude error is 0.483% and 0.575%, which indicates that the two transducers have basically the same dynamic performance and can meet the requirements of dynamic centrifugal tests with frequencies equal or less than 200 Hz. (3) From the static stepwise centrifugal loading and repeated tests after 39 days, the results of the two transducers with different buried depths are highly consistent with the theoretical values, the average amplitude error is 0.347% and 0.392%, and the repeatability index is 0.157% and 0.169%, which indicates that they have excellent long-term stability and consistency. (4) The results of the two transducers with different dynamic loads are nearly consistent in centrifugal model tests. The maximum time lag of peak value and the minimum correlation coefficient are 1.76 ms and 0.9908, which proves that the DSP-II reach the measurement performance of the PDCR-81. The research work and conclusions are essential for advancing pore water pressure measurement technology, and may provide important guidance and design method.

     

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