Design of drum centrifuge with two-directional shaking

物理模型是岩土工程领域发展迅速的一个领域，其中转鼓离心机相对于梁式离心机具有独特的优势，并探索了各种可能性。首席调查员有在宇都宫大学设计两台滚筒离心机的经验，自1991年以来一直致力于开发用于岩土工程教学的滚筒离心机，自1991年以来与剑桥大学合作，第一个版本自1994年以来一直在广岛大学运行。该研究项目的目的是在东京工业大学设计和安装一台直径1.2 m的转鼓离心机，并开发双向振动能力。研究项目的主要成果是开发模型地面施工方法和在转鼓离心机上工作的各种执行器。模型地基的施工方法有砂土地基、原状地基、粘土地基、挤密砂桩加固粘土地基、膨润土砂交替层地基等。本项目开发的执行器包括推进式和拉出式加载系统和波浪发生器。针对可能出现的双向振动问题，提出了相应的设计策略。在总结宇都宫大学研制的卧式振动筛经验的基础上，借鉴臂式离心机颠簸路面系统的概念，设计制造了转鼓连续冲击装置。显然，由于转鼓的能量较大，没有出现明显的垂直分量。

Physical modeling is an area of rapid development in geotechnical engineering field, in which drum centrifuge has unique advantages over beam type centrifuge and various possibilities have been explored. Head investigator has experiences of designing two drum centrifuges at the University of Utsunomiya and has been working on the development of drum centrifuge for geotechnical teaching, collaboration with Cambridge University since 1991 and the first version has been operating at Hiroshima University since 1994. This research project aims to design and install a 1.2 m diameter drum centrifuge at the Tokyo Institute of Technology and to develop a two -directional shaking capability.The main outcomes of the research project are the development of model ground construction methods and various actuators working at the drum centrifuge. The methods of model ground construction included, sand ground, undisturbed ground, clay ground, clay ground improved by sand compaction piles, and alternate layers ground of bentonite and sand. The actuators developed in this project include push-in and pull-out loading systems and wave generators. For the possible design strategies for two-directional shaking were proposed. Based on the past experiences of horizontal shaker developed at the Utsunomiya University and the concept of bumpy road system developed for arm type centrifuge, the device for creating a series of impact on the rotating drum was designed and manufactured. It was clear that due to large energy of rotating drum, distinguishable vertical component did not occur.