ABSTRACT
Dynamic compaction (DC) improves weak soils by controlled high-energy tamping where the applied energies can be greater than 100 times that of
CONTENTS
3.1 Introduction ................................................................................... 57 3.2 History ........................................................................................... 58 3.3 Plant and equipment ....................................................................... 58 3.4 Terminology ................................................................................... 60 3.5 How dynamic compaction works ................................................... 61
3.5.1 Granular soils ...................................................................... 62 3.5.2 Cohesive soils ....................................................................... 65 3.5.3 Landlls ............................................................................... 68 3.5.4 Collapsible soils ................................................................... 69
3.6 Site investigation ............................................................................. 70 3.7 Depth of treatment ......................................................................... 70 3.8 Environmental considerations ........................................................ 72 3.9 Practical aspects ............................................................................. 74 3.10 Induced settlement .......................................................................... 75 3.11 Additional comments ...................................................................... 76 3.12 Testing ............................................................................................ 78
3.12.1 Standard penetration test ..................................................... 79 3.12.2 Pressuremeter ....................................................................... 80 3.12.3 Dynamic cone test ............................................................... 80 3.12.4 Static cone penetration test .................................................. 80 3.12.5 Dilatometer .......................................................................... 81
3.13 Case histories .................................................................................. 81 3.14 Concluding remarks ....................................................................... 82 Acknowledgment .................................................................................... 84 References ............................................................................................... 84
driven piling. The reaction of soils during dynamic compaction treatment varies with soil type and energy input. A comprehensive understanding of soil behaviour, combined with experience of the technique, is therefore vital to successful improvement of the ground. Dynamic compaction is capable of achieving signicant improvement to substantial depth, often with considerable economy when compared to other geotechnical solutions.
