基于环圈仪的土压力传感器标定技术分析
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摘要
合理地进行土压力传感器标定是提高土压力测试精度的基本保证,环圈仪由于克服了侧壁摩擦的影响,被认为是一种良好的标定设备。运用有限元分析,探讨了环圈仪侧壁与土介质摩擦接触条件、加载板与土介质表面的不均匀接触状态、土压力传感器与土介质的刚度不匹配等因素对环圈仪内土介质应力场分布特征的影响。基于环圈侧壁和加载板等边界条件与土压力传感器本身引起的土介质应力场变化范围互不叠加的原则,提出了环圈仪直径和高度的确定方法。通过试验对环圈仪减小侧壁摩擦的效果进行了验证,利用环圈仪进行标定试验得到的匹配误差与理论计算结果吻合很好,验证了环圈仪标定土压力传感器技术的可靠性。
Reasonable calibration of earth pressure transducer is the basic guarantee to improve the precision of earth pressure measurement.Ring-loop instrument is considered as good calibration equipment due to it overcomes the effect of lateral wall friction.By using finite element analysis,the influence of the friction contact condition between lateral wall and earth medium,the influence of the non-uniform contact state between loading plate and earth medium surface,and the influence of the stiffness mismatch between earth pressure transducer and earth medium on the distribution characteristics of earth medium stress field in ring-loop instrument were discussed.Based on the principle that the variation range of earth medium stress field caused by boundary condition between ring-loop lateral wall and loading plate are not superposed with the variation range of earth medium stress field caused by earth pressure transducer itself,a method for determining the diameter and height of ring-loop gauge was proposed.The effect of ring-loop instrument to reduce the lateral wall friction is verified through experiment.The matching error obtained from the calibration experiment with the ring-loop instrument is in good agreement with the theoretically calculated result,which verifies the reliability of the earth pressure transducer calibrated by ring-loop instrument.
Reasonable calibration of earth pressure transducer is the basic guarantee to improve the precision of earth pressure measurement.Ring-loop instrument is considered as good calibration equipment due to it overcomes the effect of lateral wall friction.By using finite element analysis,the influence of the friction contact condition between lateral wall and earth medium,the influence of the non-uniform contact state between loading plate and earth medium surface,and the influence of the stiffness mismatch between earth pressure transducer and earth medium on the distribution characteristics of earth medium stress field in ring-loop instrument were discussed.Based on the principle that the variation range of earth medium stress field caused by boundary condition between ring-loop lateral wall and loading plate are not superposed with the variation range of earth medium stress field caused by earth pressure transducer itself,a method for determining the diameter and height of ring-loop gauge was proposed.The effect of ring-loop instrument to reduce the lateral wall friction is verified through experiment.The matching error obtained from the calibration experiment with the ring-loop instrument is in good agreement with the theoretically calculated result,which verifies the reliability of the earth pressure transducer calibrated by ring-loop instrument.
引文
[1]曾辉,余尚江,陈佳妍.岩土压力传感器静匹配问题的研究进展[J].岩土力学,2005,26(7):1173-1176(ZHENG Hui,YU Shangjiang,CHENG Jiayan.Development of research on pressure transducer static matching error in rock and soil[J].Rock and Soil Mechanics,2005,26(7):1173-1176(in Chinese))
[2]曾辉,余尚江.岩土压力传感器匹配误差的计算[J].岩土力学,2001,22(1):99-105(ZHENG Hui,YU Shangjiang.The calculation of matching error of rock-soil pressure transdure[J].Rock and Soil Mechanics,2001,22(1):99-105(in Chinese))
[3]曾辉,余尚江.岩土压力传感器匹配误差的特性[J].岩土力学,2004,25(12):2003-2006(ZHENG Hui,YU Shangjiang.Characteristics of matching error of rock-soil pressure transdure[J].Rock and Soil Mechanics,2004,25(25):2003-2006(in Chinese))
[4]余尚江,曾辉.土中自由应力场与结构表面压力测量的差异[J].岩土工程学报,2003,25(6):684-687(YU Shangjiang,ZHENG Hui.The difference between measurements of stress in soil and pressure on wall-surface[J].Chinese Journal of Geotechnical Engineering,2003,25(6):684-687(in Chinese))
[5]俞儒一,安春春.土压力传感器的动力匹配问题初探[J].岩土工程学报,1988,10(6):38-47(YU Ruyi,AN Chunchun.Preliminary study on dynamic matching for soil pressure transducers[J].Chinese Journal of Geotechnical Engineering,1988,10(6):38-47(in Chinese))
[6]汪恩清,丁世敬.土压力传感器动匹配误差理论研究[J].岩土力学,1999,20(3):79-83(WANG Enqing,DING Shijing.The investigation for dynamic matching error in the registration of soil pressure cells[J].Rock and Soil Mechanics,1999,20(3):79-83(in Chinese))
[7]刘宝有.钢弦式传感器及其应用[M].北京:中国铁道出版社,1986(LIU Baoyou.Vibrating wire pressure sensors and application[M].Beijing:China Railway Publishing House,1986(in Chinese))
[8]刘宝有.土压力传感器的标定方法[J].传感器技术,1990(3):42-45(LIU Baoyou.Calibration method of soilpressure sensors[J].Transducer Technology,1990(3):42-45(in Chinese))
[9]刘宝有.电阻应变式土压力传感器土中标定的试验研究[J].传感器技术,1987(4):7-13(LIU Baoyou.Study on the calibration test in soil of resistance strain soil-pressure sensors[J].Transducer Technology,1987(4):7-13(in Chinese))
[10]李春林,陈青春,丁启朔.用于土壤压实监测的土压力传感器标定[J].实验技术与管理,2010,27(4):63-66(LI Chunlin,CHEN Qingchun,DING Qishuo.Calibration of soil pressure sensors for compaction monitoring[J].Experimretial Technology and Management,2010,27(4):63-66(in Chinese))
[11]韦四江,王大顺,郜进海,等.微型土压力盒的标定及修正[J].地下空间与工程学报,2009,5(5):1003-1006(WEI Sijiang,WANg Dashun,GAO Jinhai,et al.Calibration and correction of miniature earth pressure cell[J].Chinese Journal of Underground and Space and Engineering,2009,5(5):1003-1006(in Chinese))
[12]陈春红,刘素锦,王钊.土压力盒的标定[J].中国农村水利水电,2007(2):29-32(CHEN Chunhong,LIU Sujing,WANG Zhao.Calibration of earth pressure cell[J].China Rural Water and Hydropower,2007(2):29-32(in Chinese))
[13]Bathe K J.ADINA theory and modeling guide[M].ADINA R&D,Inc.,2010.
[14]程展林,左永振,姜景山,等.粗粒料试验中界面摩阻力的试验研究[J].岩土工程学报,2009,31(3):331-334(CHENG Zhanlin,ZUO Yongzhen,JIANG Jingshan,et al.Expermental research on interface friction in granular materials[J].Chinese Journal of Geotechnical Engineering,2009,31(3):331-334(in Chinese))
[15]张立祥,罗强,刘钢,等.基于正交试验的匹配误差影响因素分析[J].传感器与微系统,2011,30(3):50-53(ZHANG Lixaing,LUO Qiang,LIU Gang,et al.Analysis of matching error of soil pressure transducer based on orthogonal design[J].Transducer and Microsystem Technologies.2011,30(3):50-53,56
[2]曾辉,余尚江.岩土压力传感器匹配误差的计算[J].岩土力学,2001,22(1):99-105(ZHENG Hui,YU Shangjiang.The calculation of matching error of rock-soil pressure transdure[J].Rock and Soil Mechanics,2001,22(1):99-105(in Chinese))
[3]曾辉,余尚江.岩土压力传感器匹配误差的特性[J].岩土力学,2004,25(12):2003-2006(ZHENG Hui,YU Shangjiang.Characteristics of matching error of rock-soil pressure transdure[J].Rock and Soil Mechanics,2004,25(25):2003-2006(in Chinese))
[4]余尚江,曾辉.土中自由应力场与结构表面压力测量的差异[J].岩土工程学报,2003,25(6):684-687(YU Shangjiang,ZHENG Hui.The difference between measurements of stress in soil and pressure on wall-surface[J].Chinese Journal of Geotechnical Engineering,2003,25(6):684-687(in Chinese))
[5]俞儒一,安春春.土压力传感器的动力匹配问题初探[J].岩土工程学报,1988,10(6):38-47(YU Ruyi,AN Chunchun.Preliminary study on dynamic matching for soil pressure transducers[J].Chinese Journal of Geotechnical Engineering,1988,10(6):38-47(in Chinese))
[6]汪恩清,丁世敬.土压力传感器动匹配误差理论研究[J].岩土力学,1999,20(3):79-83(WANG Enqing,DING Shijing.The investigation for dynamic matching error in the registration of soil pressure cells[J].Rock and Soil Mechanics,1999,20(3):79-83(in Chinese))
[7]刘宝有.钢弦式传感器及其应用[M].北京:中国铁道出版社,1986(LIU Baoyou.Vibrating wire pressure sensors and application[M].Beijing:China Railway Publishing House,1986(in Chinese))
[8]刘宝有.土压力传感器的标定方法[J].传感器技术,1990(3):42-45(LIU Baoyou.Calibration method of soilpressure sensors[J].Transducer Technology,1990(3):42-45(in Chinese))
[9]刘宝有.电阻应变式土压力传感器土中标定的试验研究[J].传感器技术,1987(4):7-13(LIU Baoyou.Study on the calibration test in soil of resistance strain soil-pressure sensors[J].Transducer Technology,1987(4):7-13(in Chinese))
[10]李春林,陈青春,丁启朔.用于土壤压实监测的土压力传感器标定[J].实验技术与管理,2010,27(4):63-66(LI Chunlin,CHEN Qingchun,DING Qishuo.Calibration of soil pressure sensors for compaction monitoring[J].Experimretial Technology and Management,2010,27(4):63-66(in Chinese))
[11]韦四江,王大顺,郜进海,等.微型土压力盒的标定及修正[J].地下空间与工程学报,2009,5(5):1003-1006(WEI Sijiang,WANg Dashun,GAO Jinhai,et al.Calibration and correction of miniature earth pressure cell[J].Chinese Journal of Underground and Space and Engineering,2009,5(5):1003-1006(in Chinese))
[12]陈春红,刘素锦,王钊.土压力盒的标定[J].中国农村水利水电,2007(2):29-32(CHEN Chunhong,LIU Sujing,WANG Zhao.Calibration of earth pressure cell[J].China Rural Water and Hydropower,2007(2):29-32(in Chinese))
[13]Bathe K J.ADINA theory and modeling guide[M].ADINA R&D,Inc.,2010.
[14]程展林,左永振,姜景山,等.粗粒料试验中界面摩阻力的试验研究[J].岩土工程学报,2009,31(3):331-334(CHENG Zhanlin,ZUO Yongzhen,JIANG Jingshan,et al.Expermental research on interface friction in granular materials[J].Chinese Journal of Geotechnical Engineering,2009,31(3):331-334(in Chinese))
[15]张立祥,罗强,刘钢,等.基于正交试验的匹配误差影响因素分析[J].传感器与微系统,2011,30(3):50-53(ZHANG Lixaing,LUO Qiang,LIU Gang,et al.Analysis of matching error of soil pressure transducer based on orthogonal design[J].Transducer and Microsystem Technologies.2011,30(3):50-53,56