土工动力离心模型试验中物理破坏模拟比较及关键问题

A Comparison of Dynamic Response and Failure Simulations in Geotechnical Dynamic Centrifugal Model Tests and the Key Issues

摘要:

针对土工动力离心模型试验中模型与原型在动力响应和动力破坏模拟两个不同层次的相似程度。首先分析总结离心模型试验在动力响应模拟、动力破坏模拟两个方面的研究发展现状；然后分析这两种模拟模型中的相似比尺的实现要求、特点和区别；最后，针对抗滑模型桩和地铁模型，分析推导动力离心模型在动力响应模拟和动力破坏模拟中具体的模型理论比尺关系和关键问题，进一步指出目前土工动力离心模型试验研究存在的一些问题和发展方向。分析结果表明，针对模型与原型的相似比尺关系，动力破坏模拟模型的相似条件远比动力响应模拟模型的相似条件要求更为严格，这也是动力破坏模拟模型能够揭示岩土结构原型破坏的根本原因。

Abstract:

Focusing on two similar levels of the simulation of dynamic response and dynamic failure in the model and the prototype for geotechnical dynamic centrifuge model tests，this paper analyzes and summarizes the research and development status of the simulation of dynamic response and failure in the centrifugal model test.The implementation requirements and differences of a similar scale were analyzed in simulations of the dynamic response and failure.According to the anti-slide pile and tunnel models，the specific model-theoretical scale relationships were deduced, and the key problems of the simulation of dynamic response and failure in the dynamic centrifuge model are discussed in the paper.The existing problems and development direction of the geotechnical dynamic centrifuge model test are described.The results show that for a similar scale relationship between the model and the prototype，there is a stricter similar scale requirement for the dynamic failure model than for the dynamic response model，which is the fundamental reason that the dynamic failure simulation model can reveal the prototype failure of geotechnical structure.