Application of Down-Hole Dynamic Compaction (DDC) in Thick-Bedded Collapsible Loess Area

By means of engineering cases,the application of down-hole dynamic compaction(DDC method) in thick-bedded collapsible loess area was discussed.This method,not only to eliminate collapsibility of foundation soil,but also to greatly improve its bearing capacity so that obvious results of treating foundation can gained and raw materials can widely used,has the extensive applicability and good application foreground that can use local materials,save cultivated land,and protect eco-environment so as to reduce the engineering cost.