Overview: This lecture will discuss results of recent research to improve the prediction of tunnel-induced ground movements in clay. We have developed and applied analytical solutions to investigate the measured 2D ground movements associated with open-face shield and closed-face EPB tunneling projects in stiff London Clay. Our approach optimizes a set of mode-shape parameters at the tunnel cavity in order to match the free-field ground movements and then uses these control parameters to predict the building response. The methodology has been extensively validated using data from the recent Crossrail project.|
We have also investigated directly the relationship between closed-face tunneling control parameters (face and grouting pressure) and the ground movements using 3D finite element analyses. We have extended the analyses to mixed face conditions and are now able to demonstrate a prototype design procedure for predicting and controlling surface settlements for tunneling across interfaces between clays on contrasting strength and stiffness properties.
Andrew J. Whittle is the Edmund K. Turner Professor of Civil and Environmental Engineering at MIT. His research deals with the development of constitutive models for soil behavior and their application in predicting the performance of foundations and underground construction projects. He has also carried out extensive research on wireless sensor networks for monitoring underground infrastructure notably in the detection and localization of leaks in water pipe networks. He serves as Chief Scientific Advisor for a start-up company, Visenti Pte. He has served on review panels for hurricane protection systems in New Orleans (NRC), and the stem-to-stern safety of the Big Dig tunnels in Boston, and was a Director for the Massachusetts Department of Transportation (2009-2015).
Dr Whittle is a Co-Editor of the International Journal of Numerical and Analytical Methods in Geomechanics (since 1999). He has published more than 200 papers in refereed journals and conferences, and received several awards for his work from the American Society of Civil Engineers, including the Casagrande Award (1994), the Croes Medal (1994), Middlebrooks Prize (1997, 2002, and 2005) and Huber Research Award (1998). He is a licensed professional engineer in New York State. In 2010 he was elected to the National Academy of Engineering.
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