盒式土压力传感器标定测试研究  

Calibration Testing Research of Box-type Soil Pressure Sensors

作　　者：姜彦彬 周汤啸 瞿浩 张震东 韩劭恒 JIANG Yan-bin;ZHOU Tang-xiao;QU Hao;ZHANG Zhen-dong;HAN Shao-heng(Jinling Institute of Technology,Nanjing 211169,China;Key Laboratory of Reservoir Dam Safety of the Ministry of Water Resources,Nanjing 210024,China;Hohai University,Nanjing 210098,China)

机构地区：[1]金陵科技学院建筑工程学院,江苏南京211169 [2]水利部水库大坝安全重点实验室,江苏南京210024 [3]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《金陵科技学院学报》2024年第1期31-38,共8页Journal of Jinling Institute of Technology

基　　金：国家自然科学基金青年项目(52208346);江苏省高等学校基础科学(自然科学)研究面上项目(22KJB560017);水利部水库大坝安全重点实验室开放基金(YK323008);江苏省产学研合作项目(BY20231298);金陵科技学院科研项目(jit-b-202130,jit-fhxm-202106);金陵科技学院科教融合项目(2022KJRH12);大学生创新训练计划项目(202313573016Z)。

摘　　要：土压力传感器标定是土工测试的关键基础工作,标定装置与方法标准尚未形成共识。基于固结试验加载平台,提出了垫片型和等径型两种土压力传感器标定装置,并使用砂土针对盒式土压力传感器及轴力传感器开展了对比测试。研究表明,盒式土压力传感器的加载卸载标定系数线性度尚可,但存在一定滞回性。垫片型、等径型标定装置所得砂土标定系数分别低于、高于液压厂标系数,标定装置的内部尺寸对标定结果影响显著。轴力传感器标定测试及数值模拟结果均表明等径型标定装置内传感器上覆压强与加载量相等,符合标定装置的基本工作条件,但垫片型标定装置内竖向应力分布不均匀,导致内部传感器上方的压强低于加载量。上述研究为深化对土压力传感器标定的认识提供了有益参考。Calibration of soil pressure sensors is a fundamental task in geotechnical testing,but a consensus on standard calibration devices and methods has yet to be reached.Based on loading platform for consolidation test,two types of calibration devices for soil pressure sensors,namely shim type and equal diameter type,are proposed.Comparative tests are conducted using sandy soil for box-type soil pressure sensors and axial force sensors.The research indicates that the linearity of the loading-unloading calibration coefficient of box-type soil pressure sensors is acceptable,but there is a certain hysteresis existing.The calibration coefficients obtained from shim type and equal diameter type calibration devices are respectively lower and higher than those from hydraulic factory calibration,indicating a significant influence of the internal dimensions of the calibration device on the calibration results.Both calibration tests and numerical simulation results for axial force sensors show that the overburden pressure on the sensor in the equal diameter type calibration device is equal to the applied load,which meets the basic working conditions of the calibration device.However,the shim type calibration device exhibits uneven vertical stress distribution internally,resulting in lower pressure above the sensor than the applied load.This research provides valuable reference for a deeper understanding of soil pressure sensor calibration.

关 键 词：土压力传感器 标定装置 垫片型 等径型 竖向应力分布 

分 类 号：TU411[建筑科学—岩土工程]