Technical Evening: “Liquefaction triggering from a slow, drained increase in phreatic surface” with David Reid (Research Fellow, UWA)
March 9 @ 17:30 - 19:30 AWSTFree
Clear evidence of the ability of a slow, drained increase in phreatic surface to trigger liquefaction in loose soils – referred to typically as the constant shear drained (CSD) stress path – has been available for about 30 years. However, it is arguably the least appreciated and understood trigger mechanism for liquefaction. Clearly, increasing the appreciation of the CSD trigger mechanism is important to ongoing efforts to increase the safety of mine waste deposits, which often include loosely-placed materials and could have a rising phreatic surface under many conceivable scenarios. The purpose of the talk is to provide a summary of the clear evidence of CSD triggering, historical examples where this was the cause of failure, and some theoretical background on the process in the context of critical state soil mechanics.