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Condition indicators for soil behavior under earthquake loading

Abstract:

In working package 4 of the MERCI framework, the behavior of soils under earthquake loading is investigated to provide physical based condition indicators rather than the empirical ones used in most microzonation and risk analyses. Focus is given to liquefaction of soils as it provides an enormous potential of damages on structures. Ground amplification is based on a one-dimensional analysis using linear equivalent soil parameters presuming level ground conditions. Different procedures in determining or combining both indicators in an efficient and state-of-the art way are evaluated, while the non-linearity of this interaction is neglected in this approach. To enhance the condition indicators for liquefaction, laboratory experiments are carried out on clean to silty sand to investigate the influence of the loading function (given by earthquakes) and the influence of the initial stress state on different soils by using a hollow cylinder apparatus (HCA). In this presentation, the relevant Condition indicators for liquefaction are identified first. The procedure using laboratory and field methods is explained and its implementation in the Bayesian network is shown. The effect on the results on liquefaction potential of using procedures defined by various codes will be discussed briefly. The laboratory investigation program with the HCA is introduced and first results are shown considering the influence of the loading function on fine sand and introducing the potential condition indicator is presented, which will be formulated to be implemented in the final Bayesian net.

Authors:

Buchheister, Juliane

Index Terms:

earthquake; condition indicator; soil behaviour; hollow cylinder apparatus; SoilGroup; Buchheister, Juliane

Further Information:

Date published: 28.08.2006