This volume contains papers contributed by experts on recent developments in geotextiles, geomembranes, and other geosynthetics in ground improvement. The papers presented here comprise the twelfth volume of a series of publications on the annual geotechnical symposia. For ease of reference this volume has been divided into four sections, namely: Laboratory and field tests; Embankments, excavations, slopes and earth retaining structures; Soil and rock improvement schemes; Site investigation and other selected topics.