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

自从80年代初期，在许多中央的depaus中，都可以使用摇动者进行离心模型和各种振动者的类型在东京技术学院（Toky of Technitute of The Mark III Central）在Tokeo the Necsary的Necsary中，在Tit Mark III Central中独立开发了摇动餐桌的垂直运动。 30度是对对称的摇动表，可以通过将相同的位移放在同一相相的圆柱体上。固定在反应框架上。摇晃的表可以完全针对动态运动。使用新开发的2D振动器，进行了初步测试以检查其水平和垂直运动。