本文指出了用振动单剪仪进行不排水试验存在的一些问题,分析了叠环式剪切盒的缺陷,详细介绍了我们研制的常体积振动单剪仪.该单剪仪为电磁激振式,有一特殊的静力加荷系统,以加筋乳胶膜作为剪切盒.它不仅具有普通的振动单剪仪的一切功能,还可以用来进行螺母加载或砝码加载常体积试验,可在?肖除了孔压的情况下测定土的不排水动力特性,从而克服了不排水试验存在的问题.本文还给出了饱和砂样的不排水、砝码加载常体积、螺母加载常体积振动液化试验,及干砂样的螺母加载常体积振动液化试验的结果,并进行了分析比较,表明常体积液化试验基本上不受试样饱和度的影响,甚至可用干砂样测试砂的振动液化特性,具有迅速简便的优点. 一、引言 1976年唐山地震后,国内对砂土液化的研究更加重视起来.在我国,振动三轴仪是室内研究砂土液化最早使用的仪器,并积累了不少经验和资料.然而动三轴试验对现场 This paper points out some problems in the undrained test using a single vibration shearing machine, analyzes the defects of the stacked ring shear box, and describes in detail the constant volume vibration single shear instrument developed by us. The single shear instrument is an electromagnetic excitation type. There is a special static loading system with reinforced latex film as the shear box. It not only has all the functions of ordinary vibration single shears, but also can be used for nut loading or weight loading and constant volume testing. Shaw measures the undrained dynamic characteristics of soil in addition to pore pressure, thereby overcoming the problems of undrained tests. This paper also presents the undrained, saturated weighted loading volume, nut-loaded, constant-volume vibrating liquefaction of saturated sand samples. The test and the results of dry-sand nut loading constant-volume vibration liquefaction test, and analysis and comparison show that the constant-volume liquefaction test is basically not affected by the saturation of the sample, and even the dry sand sample can be used to test the vibration liquefaction characteristics of the sand. , has the advantages of rapid and simple. I. INTRODUCTION After the Tangshan earthquake in 1976, domestic research on liquefaction of sand became more important. In China, vibration triaxial apparatus is the earliest use of sand liquefaction in indoor research. Devices, and accumulated a lot of experience and information. However, dynamic triaxial tests on site