Proceedings of sessions at the ASCE National Convention, held in Dallas, Texas, October 24-28, 1993.

This Geotechnical Special Publication (GSP 39) consists of 17 papers that include both practice and research in the analysis and design of geotechnical engineering and geoenvironmental works in unsaturated soils. The first part on unsaturated soil behavior addresses the history as well as current trends in unsaturated soil mechanics, methods of predicting volume change of compacted and naturally occurring soils, laboratory and field methods for obtaining unsaturated soil characteristics, unsaturated flow, and unsaturated hydraulic conductivity determination. The second part on mitigation of expansive soil damage addresses engineering practice and case histories on shrink/swell behavior, performance of moisture barriers, and performance of foundations and also focuses on successful methods of avoiding or mitigating damage for soil movements. The issues addressed in these proceedings are intended to demonstrate the wide range on unsaturated soils problems and to show advances in unsaturated soil mechanics practice.