Criterion for Flow Liquefaction Instability
This paper describes a general liquefaction flow instability criterion for elastoplastic soils based on the concept of loss of uniqueness.We apply the criterion to the general case of axisymmetric loading and invoke the concepts of effective stresses and loss of controllability to arrive at a general criterion for the onset of liquefaction flow.The criterion is used in conjunction with an elastoplastic model for sands to generate numerical simulations.The numerical results are compared with experimental evidence to give the following insights into predicting liquefaction.1) The criterion proposed clearly and naturally differentiates between liquefaction flow (instability) and cyclic mobility.2) Flow liquefaction not only depends on the potential of the material to generate positive excess pore pressures,but more importantly,it also depends on the current state of the material,which is rarely predicted by phenomenology.
Undrained instabilities elastoplasticity flow liquefaction sands
José E.Andrade Alfonso M.Ramos Arcesio Lizcano
Civil and Mechanical Engineering,California Institute of Technology,1200E.Califomia Blvd.Pasadena,CA Geophysical Institute,Pontificia Universidad Javeriana,Cra 7 No 42-27 Bogotá,Colombia Civil and Environmental Engineering,Universidad de Los Andes,Cra 1 No 18 A-12,Bogotá,Colombia
国际会议
北京
英文
167-172
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）