用迭环式单剪仪做不排水周期剪切试验测饱和砂土的液化应力时,由于封闭试样的橡胶膜受力后拉伸,发生侧向膨胀的影响,使得量测的孔隙水压力偏低,文中分析了体积依从性的影响,还介绍了做排水试验的电容式体变传感器以及高灵敏度差动电感式位移传感器的结构。这两种自制的传感器均配接于动态电阻应变仪上,制作和使用方便,经试验证明其性能良好,并可用于其它土工动力试验中。 When the liquefied stress of saturated sand is measured by the cyclic shear test, the pressure of the pore-water pressure Low, the paper analyzed the impact of volume compliance, but also introduced the capacitance displacement sensor to do the drainage test and high sensitivity differential inductive displacement sensor structure. Both of these self-made sensors are attached to a dynamic resistance strain gauge, which is easy to manufacture and use and has been tested to demonstrate good performance and can be used in other geotechnical tests.