摘要
本文叙述了土工模型放在离心力场中的必要性,介绍了南京水利科学研究院研制的20gt土工离心机。自1982年起,已在该机上用离心模拟技术解决陆上及近海的岩土工程技术难题,叙述了这些试验项目与离心模拟数据采集系统;本文还介绍了已研制多年的具有激振功能的400gt大型土工离心机的总体布置、结构型式与驱动系统以及确定该机规格性能的根据。该大型离心机计划于1990年年底建成使用 该机设有80年代国际先进水平的动态平衡系统、水工模型试验用的供水系统及模拟地震装置等,所以本机可用于检测海洋工程受风暴、波浪及地震等动荷载影响时,基础工程在海底的稳定性,这是海上采油等结构物常遇到的重大难题。因此,利用此台大型离心机进行离心模型试验,并结合数值分析以及大比尺的现场试验等常用方法,将是优化海洋工程设计、施工及管理维修等方面的重要手段。另外,南京水利科学研究院于1989年建成和投入使用了一台50gt土工离心机,本文不详细介绍。
This paper describes the desirability of geotechnicsl models placed in centrifuge, and introduces the 20gt geotechnical centrifuge developed by Nanjing Hydraulic Research Institute(NHRI),which was the first at home in 1982 to use centrifuge modelling for investigating difficult problems of geotechnical engineering on land and in sea. A summary of the projects finished in this centrifuge and of the microcomputer based data acquisition system used for centrifuge modelling is given next.Finally, the deveoplment of a 400 gt large centrifuge with stakitng capacity s presented. The paper describes the general arrangement of the centrifuge facilities,the main structure of the centrifuge and power driver. The reason for the centrifuge performances is also explained. The new centrifuge is scheduled for completion in the end of 1990. Although the stability of the offshore structural foundation ( e. g. open-sea oil production platform,etc. ) with dynamic loads due to wind, ice or current forces, imoact or earthquake is a very difficult problem, we will study the geotechnical problem by means of the advanced large centrifuge, in which three system, i.e. in-flight balancing system, water flow system and earthquake simulator are installed. A combination of centrifuge model testing, numerical analysis such as FEM ( Finite Element Method), and large-scale field testing will significantly enhance the design of safer and more economical offshore structures.
出处
《海洋工程》
CSCD
北大核心
1990年第3期55-62,共8页
The Ocean Engineering
