Abstract
The purpose of this study is to examine in more detail under what conditions would spatial averaging over some prescribed region be sufficient to reproduce the response statistics arising from a spatially variable field. The spatially variable undrained shear strength is first simulated by a random field, and the actual response of a spatially variable clay in three problems (soil column, retaining wall, shallow foundation) is simulated using the random finite element method. This actual response is then compared to the spatial average response (the response of a homogeneous clay whose undrained shear strength is equal to certain spatial average). It is observed that the actual response can be well approximated by the spatial average response only for situations where the critical slip curve is constrained. This constraint is the most significant for the retaining wall and the least significant for the soil column.
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