Large Mat Foundation Analysis on Expansive Soil

by James P. Stewart, Syracuse Univ, Syracuse, NY, USA,
Lawrence D. Johnson, Syracuse Univ, Syracuse, NY, USA,

Document Type: Proceeding Paper

Part of: Geotechnical Aspects of Stiff and Hard Clays


This paper describes a comparison of predicted and observed performance of mat foundations on stiff expansive soil. Foundation performance was predicted using a new computer program BOSEF that explicitly accounts for soil moisture movement as well as soil structure interaction. The steady state moisture flow model adopted herein is appropriate for the longterm moisture regime near the interior of a large mat. The approach may not be appropriate near the edges of mats or for small mats or when seasonal moisture changes are significant. Computer program BOSEF is tested against previously published and unpublished mat foundation observations. The results show that moisture flow analysis is an important aspect of mat behavior on expansive clays.

Subject Headings: Soil water | Moisture | Soil analysis | Computer software | Soil stabilization | Soil water movement | Mat foundations | Porous media flow

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