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Club Meetings
UCA - Webinar Lunch and Learn
Department / Organization: Underground Construction Association
FREE FOOD - Please join us for a webinar on Tunnels in Swelling Ground on Aug. 28th, 12PM - 1PM , Berthoud 206
UCA will provide lunch for in person attendees. The webinar will be streamed to the in person audience.
We will start with a brief introduction to the new book on tunneling “Tunnel Design Methods” by A. Bobet and H.H. Einstein with a short discussion about the book contents and the book objectives. This will be followed by one of the aspects of tunneling, included in the book, which is that of tunnels in swelling ground. Swelling ground, i.e. time dependent volume increase, can have detrimental effects on tunneling. Very often swelling occurs together with squeezing i.e. time dependent shear deformations. In this presentation the emphasis will be placed on swelling ground with a few remarks on combined swelling and squeezing. The discussion will start with a brief description of the underlying physico-chemical processes, which can be subdivided into (physico) chemical processes, and largely mechanical processes. This is done through a description of the processes and examples of these processes affecting the performance of tunnels. Next will be descriptions of the associated testing and of a few models representing the processes. All this then leads to design in which we present the passive (flexible) or active (resistance) methods as well as combinations and other actions with which damage caused by swelling can be limited.
