Anisotropic deformation characteristics of geomaterials in a wide strain range

宽应变范围内岩土材料各向异性变形特征

基本信息

批准号：
10555161
负责人：
TAKEMURA Jiro
金额：
$ 8.26万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555161/
关键词：
Earthquake Shaking table Reinforced soil Centrifuge model tests 水平-鉛直加速度

项目摘要

Since early 80's there have been a lot of developments for shakers in centrifuge modeling and now many types of shakers with various specification are available in many centrifuges all over the world. However, the shaking directions of these shakers are all horizontal and no shaker which can simulate the; vertical vibration has been developed. In Tokyo Institute of Technology, an attempt has been made to develop 2D shaker, which can make horizontal and vertical motions of shaking table independently in the TIT Mark III Centrifuge.In order to create the motion with 2 degrees of freedom, at least two actuators are necessary for the shaker. In the newly developed 2D shakers, two inclined servo-hydraulic actuators with horizontal angle of 30 degrees are symmetrically mounted underneath the shaking table. Vertical and horizontal motions can be controlled by putting the same displacements to the cylinders of the two actuators with the same phase and opposite phase respectively. The main diff … More erence between normal ID horizontal shaker and 2D H-V shaker is that the shaking table cannot be directly supported by liner way system, which tightly fixed to the reaction frame. The linear way system has two main functions, i.e., supporting the static vertical weight of the shaking table and model under centrifugal acceleration and preventing the rocking motion of the shaking table. In the 2D shaker, the static weight is supported with four air springs so that the force from the actuators underneath the shaking table can entirely act for the dynamic motions. Furthermore two pairs of parallel links were introduced between the shaking table and liner way guides to prevent the rocking motion of the table. The maximum shaking mass is 200 kg and table size are 640x510 mm. Maximum input forces are 35kN and 30kN for the horizontal and vertical directions respectively.Using the newly developed 2D shaker, preliminary tests were conducted to check its performance. It was confirmed that the horizontal and vertical motions could be independently controlled using the shaker, although there remain many things to improve the performance. Less

自80年代初以来，在离心机建模中为振动者提供了许多发展，现在许多具有各种规格的振动剂在世界各地都可以使用。但是，这些振动器的摇动方向都是水平的，没有可以模拟的振动者。已经开发出垂直振动。在东京理工学院，已经尝试开发2D振动器，这可以使在TIT Mark III离心机中独立摇动桌子的水平和垂直运动，以便以2个自由度创建运动，至少有两个执行器对于振动者来说是必要的。在新开发的2D振动器中，水平角度为30度的两个倾斜的伺服液压执行器对称地安装在摇桌下方。垂直和水平运动可以通过将相同的位移分别放在两个执行器的圆柱体和相对相的圆柱体上来控制。主要的差异……正常ID水平振动筛和2D H-V振动器之间的更加差异是，摇动桌不能由衬里方式系统直接支撑，后者将其紧密地固定在反应框架上。线性方式系统具有两个主要功能，即支持离心加速度下摇桌和模型的静态垂直重量，并防止摇桌的摇动运动。在2D振动板中，静态重量得到了四个空气弹簧的支撑，因此摇动桌子下方的执行器的力可以完全用于动态运动。此外，在摇动桌子和衬里方式指南之间引入了两对平行链路，以防止桌子的摇动运动。最大振动质量为200千克，桌子尺寸为640x510毫米。水平和垂直方向的最大输入力分别为35KN和30KN。使用新开发的2D振动筛，进行了初步测试以检查其性能。据证实，尽管还有很多东西可以改善性能，但可以使用振动脱壶独立控制水平和垂直运动。较少的