The uses of grouting in geotechnical engineering range from filling in voids to compensating for volume loss in tunnelling. The aim of this book is to improve understanding of grouting techniques and thereby to encourage its proper use. The first section looks at the main grouting techniques and explains the main principles behind them. It explores concepts such as groutability, the classification and chemistry of grouts, and grouting plant and equipment. The six main techniques - permeation, rock grouting, hydrofracture, ground compaction, jet grouting and compensation grouting - are then examined in more detail, illustrated throughout with case studies.