Stoke固定-自由型共振柱实验系统测试原理及标定方法

Test principle and calibration method of Stoke fixed-free resonant column test system

共振柱作为土动力学实验教学以及科学研究的重要设备,主要用来测试土的动力参数。目前共振柱实验在设备标定和试样安装方面存在一些问题,导致测试结果不可靠。该文基于扭转激振方式,通过推导Stoke固定-自由型共振柱的测试原理,以及不同标定棒以及附加块的重复标定实验,获得了具有不规则形状驱动系统的质量惯性矩,并对该共振柱实验设备进行了标定;通过共振柱测试软黏土的剪切模量,与动三轴和弯曲元测试结果进行了对比,得到共振柱与动三轴在应变重合范围内的剪切模量相同,以及在小应变范围的剪切模量与弯曲元测试结果接近的结论。

As an important equipment in soil dynamics experiment teaching and scientific research,the resonant column is mainly used to test the dynamic parameters of soil.At present,there are some problems in equipment calibration and sample installation of resonant column test(RCT),resulting in unreliable test results.Based on the torsional excitation mode,the Stoke fixed-free RCT equipment is calibrated by deducing the principle of the RCT,and repeated calibration tests of different calibration rods and additional blocks are carried out to obtain the mass inertia moment of the drive system with irregular shape in this paper.The shear modulus of soft clay is measured by RCT and compared with the test results of dynamic triaxial and bending element.It is found that the shear modulus of RCT and dynamic triaxial is the same in the range of strain coincidence,and the shear modulus in the small strain range is close to the test results of bending element.