Numerical Study of Settlement Reduction Ratio for the Bottom Ash Mixture Compaction Pile

??????????????? ??????????????? ????????? ???????????? ????????? ????????? ????????? ???????????? ????????? ??????????????????(SCP)?????? ?????? ??????????????????(GCP)????????? ???????????? ??????. ????????? ????????????????????? ????????? ??????????????? ??????????????? ?????? ??????????????? ?????? ???????????? ?????????, ????????????????????? ????????????????????? ??????????????? ????????? ???????????? ??????????????? ???????????? ???????????? ??????. ??????, ????????? ????????? ????????? ????????? ??????????????? ???????????? ????????? ????????? ?????? ????????? ???????????? ?????? ????????? ??????????????? ??????. ??? ??????????????? ??????????????????????????? ?????? ????????? ???????????? ???????????? ??? ???????????? ?????? ???????????? ????????????????????? ??????????????? ????????????????????? ???????????????. ??????, ???????????????????????? ????????? ?????? ???????????????(SRR)??? ???????????????. ?????? ????????? ????????? ?????????. ??????????????? ?????? ????????????????????? ??????????????? ???????????? ????????? ????????? ???????????? ???????????? ?????? ??????????????? ????????? ???????????? ?????????????????? ???????????? ????????? ?????????. ??????, ????????? 20???40%??? ??????????????? ??????????????? ?????????????????? ????????? ??? ????????? ????????????, ????????? 40% ??????????????? ???????????? ????????? ???????????? ????????? ????????????. ??? ???????????? ????????? ??????????????? ????????? ????????? ?????????????????? ?????? ??? ???????????? ??????????????? ???, 30???40%??? ???????????? ????????? ????????? ????????????.In general, sand compaction pile(SCP) method and gravel compaction pile(GCP) method have been mainly used to reinforce soft soils such as soft clay or loose sandy ground. But the sand compaction pile method has problems such as lack of sand supply and destroying the nature while collecting sand, the gravel compaction pile method has a problem such as decreased permeability of the drainage material due to clogging. Recently, the study to replace sand with bottom ash which has similar engineering properties with sand is in active. As a fundamental research on bottom ash mixture compaction pile utilizing bottom ash, its behavioral characteristics depending on granular materials and replacement ratio has been simulated numerically. In particular, Settlement Reduction Ratio(SRR) according to the distance from the center of pile was calculated. The main findings were as follows. Change values of Mixture Compaction Pile's SRR according to granular materials showed similar patterns and stiffness of the composite soil is increased depending on the replacement ratio so SRR showed decreased patterns. Especially, when the replacement ratio is in 20~40%, it increase significantly. When the replacement ratio is over 40%, it increase slowly. When considering the economics, 30~40% replacement ratio is appropriate