新型空心圆柱仪的研制与应用
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摘要
为研究交通、波浪等荷载产生的主应力轴循环旋转应力路径对土体性状的影响,研制了可以在轴力、扭矩中高频率下共同变载的空心圆柱仪(HCA),并分析了设备的技术参数和性能指标.在静态试验环境下,设备的内外围压、轴力和扭矩均可独立控制;在动态试验环境下,轴力和扭矩可作任意波形周期变化,变载频率可达5 Hz.传感器工作性能稳定,测量精度高,有多重校合,并配备了非接触式水下应变传感器.通过开发专用切样装置,利用该设备对原状黏土样进行初步试验,分别验证了仪器实现主应力轴旋转特殊应力路径以及在中、高频率下轴力和扭矩的任意波形变载功能,说明此空心圆柱仪具备模拟包括主应力轴旋转在内的复杂应力路径的工作能力.
A novel hollow cylinder apparatus(HCA) was developed to investigate the influence of cyclic principal stress rotation induced by traffic or wave loads on soil's properties,which could afford a combined axial-torsional loading system at medium-high frequency.And the HCA's technical index and loading characteristics were analyzed.This apparatus can control the inner,outer pressure,axial load and torque independently under static tests;and it can achieve the periodical change of axial load and torque in the predefined random form under high dynamic tests(5 Hz).The transducer system works stably and has high accuracy and multiple checking,moreover the non-contact underwater proximity sensors are equipped.A special cutting device was designed to investigate the apparatus' performance of realizing the special principal stress rotation stress path and the random vibration of axial load and torque at medium-high frequency with the intact clay samples,separately.The results proved the HCA's capability of simulating the complicated stress path including principal stress rotation.
A novel hollow cylinder apparatus(HCA) was developed to investigate the influence of cyclic principal stress rotation induced by traffic or wave loads on soil's properties,which could afford a combined axial-torsional loading system at medium-high frequency.And the HCA's technical index and loading characteristics were analyzed.This apparatus can control the inner,outer pressure,axial load and torque independently under static tests;and it can achieve the periodical change of axial load and torque in the predefined random form under high dynamic tests(5 Hz).The transducer system works stably and has high accuracy and multiple checking,moreover the non-contact underwater proximity sensors are equipped.A special cutting device was designed to investigate the apparatus' performance of realizing the special principal stress rotation stress path and the random vibration of axial load and torque at medium-high frequency with the intact clay samples,separately.The results proved the HCA's capability of simulating the complicated stress path including principal stress rotation.
引文
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[8]栾茂田,郭莹,李木国,等.土工静力-动力液压三轴-扭转多功能剪切仪研发及应用[J].大连理工大学学报,2003,43(5):670 675.LUAN Mao-tian,GUO Ying,LI Mu-guo,et al.Develop-ment and application of soil static and dynamic universal tri-axial and torsional shear apparatus[J].Journal of Dalian U-niversity of Technology,2003,43(5):670 675.
[9]沈扬,周建,龚晓南.空心圆柱仪(HCA)模拟恒定围压下主应力轴循环旋转应力路径能力分析[J].岩土工程学报,2006,28(3):281 287.SHEN Yang,ZHOU Jian,GONG Xiao-nan.Analysis onthe ability of HCA to imitate cyclic principal stress rotationunder constant confining pressure[J].Chinese Journal ofGeotechnical Engineering,2006,28(3):281 287.
[2]VAID Y P,SAYAO A,HOU E H,et al.Generalizedstress path dependent soil behavior with a new hollowcylinder torsional apparatus[J].Canadian GeotechnicalJournal,1990,27(5):601 616.
[3]SAYAO A,VAID Y P.A critical assessment of stressnonuniformities in hollow cylinder test specimens[J].Soils and Foundations,1991,31(1):60 72.
[4]SIVATHAYALAN S,VAID Y P.Truly undrained re-sponse of granular soils with no membrane-penetrationeffects[J].Canadian Geotechnical Jouenal,1998,35(5):730 739.
[5]ISHIHARA K,TOWHATA I.Sand response to cyclicrotation of principal stress directions as induced by waveloads[J].Soils and Foundations,1983,23(4):11 26.
[6]周云东.地震液化引起的地面大变形试验研究[D].南京:河海大学,2003.ZHOU Yun-dong.Laboratory study on large ground de-formation induced by earthquake liquefaction[D].Nan-jing:Hohai University,2003.
[7]刘汉龙,周云东,高玉峰,等.多功能静动三轴仪研制及在液化后大变形中的应用[J].大坝观测与土工测试,2001,25(5):48 51.LIU Han-long,ZHOU Yun-dong,GAO Yu-feng,et al.Design of static-dynamic dual purpose triaxial compres-sion test apparatus and its application in the study ofearthquake-induced large deformation[J].Dam Obser-vation and Geotechnical Tests,2001,25(5):48 51.
[8]栾茂田,郭莹,李木国,等.土工静力-动力液压三轴-扭转多功能剪切仪研发及应用[J].大连理工大学学报,2003,43(5):670 675.LUAN Mao-tian,GUO Ying,LI Mu-guo,et al.Develop-ment and application of soil static and dynamic universal tri-axial and torsional shear apparatus[J].Journal of Dalian U-niversity of Technology,2003,43(5):670 675.
[9]沈扬,周建,龚晓南.空心圆柱仪(HCA)模拟恒定围压下主应力轴循环旋转应力路径能力分析[J].岩土工程学报,2006,28(3):281 287.SHEN Yang,ZHOU Jian,GONG Xiao-nan.Analysis onthe ability of HCA to imitate cyclic principal stress rotationunder constant confining pressure[J].Chinese Journal ofGeotechnical Engineering,2006,28(3):281 287.
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