| Title |
The Study of Appropriate Mixture Ratio and Replacement Ratio of Bottom Ash Mixture Compaction Pile in Soft Ground |
| Authors |
도종남(Do, Jong Nam) ; 주익찬(Chu, Ick Chan) ; 채휘영(Chae, Hwi Young) ; 천병식(Chun, Byung Sik) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.4C.139 |
| Keywords |
연약지반개량;다짐말뚝공법;폐색;저회;혼합비;치환율 soft ground improvement;compaction pile method;clogging;bottom ash;mixing ratio;replacement ratio |
| Abstract |
In this study, various laboratory tests using bottom ash, which has similar engineering properties with sand, were conducted in order to solve the problem of clogging in granular compaction pile and to address sand supply and demand. In particular, testing was performed to help reduce clogging and minimize voids in a crushed stone compaction pile constructed in soft ground. Based on compaction tests and large diameter direct shear tests, an optimum mixing ratio was determined to be 80:20 (crushed stone to bottom ash) because an 80:20 mixing ratio showed the highest shear strength. Test results showed that as the bottom ash content increased above 20%, internal friction angle decreased. Another test method showed freezing and thawing had little effect when the replacement ratio was over 40%. Therefore, bottom ash mixed compaction piles in soft ground are most economical at a 40% replacement ratio. |