Prof. David M. Potts
戴维·M·波茨教授
英国伦敦帝国理工学院岩土工程教授；英国皇家工程院院士、英国土木工程师学会会士
Lecture
岩土工程分析中的应变软化行为与渐进破坏模拟
Simulating Strain Softening Behaviour and Progressive Failure in Geotechnical Analysis
Biography
嘉宾介绍
戴维·M·波茨教授本科毕业于伦敦国王学院，获剑桥大学博士学位及伦敦大学理学博士学位，是英国土木工程师学会会士、伦敦城市行业协会会士和英国皇家工程院院士，并曾作第42届Rankine讲座。
他已发表或合作发表技术论文450余篇，并因科研工作获得多项奖励，长期参与国际学术委员会、顾问组和期刊编辑工作，曾任《Computers and Geotechnics》联合主编以及《Géotechnique》荣誉主编。加入帝国理工学院前，他曾在荷兰壳牌研究实验室从事海上基础试验和理论研究。
在帝国理工学院任职期间，他长期承担岩土力学数值分析、边坡稳定、挡土结构和基础工程教学，并重点研究计算分析方法及其在实际岩土结构设计中的应用。他曾任土力学教研室主任、土木与环境工程系副主任以及岩土工程学科负责人，并广泛参与英国及海外工程咨询。
Lecture Abstract
报告摘要
中文内容根据会务组提供的英文Biography与Abstract整理。
多数土体在剪切过程中表现出应变软化行为，但在工程分析中纳入这一行为十分困难，因此在实际设计中考虑应变软化仍具有较大挑战。传统解析方法难以处理此类问题；在数值分析中，若直接将软化行为引入经典有限元法，可能产生网格依赖和数值不稳定等问题。
报告将讨论这些关键困难，并分析将非局部应变方法与有限元法结合的优点和局限。在此基础上，将进一步研究该组合方法在若干岩土工程问题中的应用，重点说明应变软化如何导致应变局部化及渐进破坏，以及相应数值方法如何提高对复杂破坏过程的模拟能力。
Biography — English+
Professor Potts obtained a B.Sc from Kings College London, a Ph.D from Cambridge University and a D.Sc. from London University. He is a fellow of the Institution of Civil Engineers, the City and Guilds of London and of the Royal Academy of Engineers. He presented the 42nd Rankine lecture. He has been author and co-author of more than 450 technical publications and has received numerous awards for his research. He has served on many editorial boards and international committees and advisory panels. He was co-editor of the international journal Computers and Geotechnics from 2011 to 2013 and honorary editor of Geotechnique from 2017 to 2020. Before joining the academic staff at Imperial College he worked at the Shell Research Laboratories in Holland on both experimental and theoretical aspects related to offshore foundations. At Imperial College he has taught courses on the use of numerical analysis in geomechanics, slope stability, earth retaining structures and foundations to both undergraduate and post graduate classes. His research has involved the development and application of computer methods of analysis and, more particularly, the application of numerical analysis to the design of real geotechnical structures. He was Head of the Soil Mechanics Section from 1998 to 2006, Deputy head of the Department of Civil and Environmental Engineering from 2002 until 2012 and Head of the Geotechnics Section from 2012 to 2014. He has consulted widely both within the UK and overseas. His position at Imperial College was sponsored by the Geotechnical Consulting Group, London from 2005 to 2022.
Abstract — English+
Most soils exhibit strain softening behaviour when sheared. However, inclusion of such behaviour in engineering analyses is problematic and therefore accounting for this behaviour in engineering design is challenging. Analytical procedures cannot deal with such behaviour and numerical analysis finds such behaviour demanding. For example, inclusion of softening behaviour into the classical finite element method can result in a lack of objectivity (i.e. mesh dependency) and numerical instability. This lecture considers these issues and discusses the advantages and disadvantages of combining the nonlocal strain approach with the finite element method. It then investigates the application of this combination to some geotechnical engineering problems in which strain softening soil behaviour results in strain localisation and progressive failure.