Determining　Static　Resistance　of　Pile　Toe　During　Driving with　　Acceleration　of　　Pile Top

A　method　based on　the　stress-wave　theory　to　estimate　the　static　resistance　at　pile　toe　during　pile　driving　has　been　developed.　　In　this　method,　the　static　resistance　at　pile　toe　can　be　calculated　directly　with　the　rebound　at　pile　top　and　impulse　duration　from　the　acceleration　signal　at　pile　top.　　Compared　with　CPT,　CASE　method　and　blowcount　test,　the　result　is　more　reliable　and　almost　independent　of　soil-damping,　ram-drop-height　and　cushion-stiffness.　　The　method　can　be　used　to　estimate　the　bearing　capacity　of　single　pile　and　to　control　the　depth　of　pile　to　be　drived.