一种在三轴压力室内测试土样剪切波速的新装置  

A New Device to Measure the Shear Wave Velocity of Soil Samples

作　　者：王建华[1] 程国勇[1] 张立[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2004年第2期152-156,共5页Journal of Tianjin University：Science and Technology

基　　金：天津市自然科学基金资助项目(023607511).

摘　　要：为了研究土的剪切波速与其三轴剪切试验力学指标之间的关系,依据扭剪振动原理,开发出一种测试三轴压力室内土样剪切波速的传感器.该传感器工作频率达5kHz,比现有同类装置低至1/10左右;体积小、发射能量大,能够测试软粘土和饱和松散砂土试样的剪切波速;测试波形无偏振.它容易与目前各种形式的静、动三轴剪切仪配套,形成剪切波速与剪切三轴联合试验装置.剪切波速测试装置对土样无扰动,测试过程快捷,测试信号稳定,测试波形中无纵波干扰,很容易识别出剪切波的初至时间.In order to study the correlation between shear wave velocity of soils and their triaxial shear test mechanics index,a new transducer is developed on the basis of torsion vibration principle.It can be used to measure shear wave velocity of soil samples in triaxial cell.Its work frequency is 5 kHz,which is almost 10 times lower than that of the same kind of shear wave velocity measurement device used at present.As a result,the transducer has very high transmitting energy so that it can be used to measure shear wave velocity of soft clays and saturated loose sands.Furthermore,the arrival time of shear wave passing through samples can be determined easily and shear wave velocity of soils can be measured by using it because its measurement signal has no polarized direction and disturbance of compressive wave.According to the working principle of the new device,the transducers used in other static or cyclic triaxial test apparatus can also be developed easily to construct new combined shear wave velocity and triaxial test systems.

关 键 词：剪切波速传感器 三轴剪切试验 扭剪振动 抗震分析 测试装置 

分 类 号：TU411[建筑科学—岩土工程] TP212[建筑科学—土工工程]