| Title |
Study on Applicability of Simultaneous Multiple Compaction Grouting Method in Soft Clay Ground |
| Authors |
이효범(Lee, Hyobum) ; 정현석(Jung, Hyun-Seok) ; 정의엽(Jung, Eui-Youp) ; 최항석(Choi, Hangseok) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.6.0779 |
| Keywords |
컴팩션 그라우팅;CGS 공법;다중 동시주입;연약지반;표준관입시험 Compaction grouting;CGS method;Multiple simultaneous injection;Soft ground;Standard penetration test |
| Abstract |
The compaction grouting method is one of the conventional ground improvement methods, which consolidates and compacts the surrounding ground through the injection of grout materials with low mobility. Injecting the grout into the ground can improve the soil properties, as well as form a composite of soil-grout columns. However, the conventional grout pumping is not applicable to handle multiple injection holes at the same time, which may diminish its constructability when the construction time is not enough. This paper proposes a simultaneous multiple compaction-grouting method using a new pump system developed to cover up simultaneously three injection holes at a time. Field injection tests with a single injection hole and with triangular arrangement of injection holes were conducted to evaluate the applicability of the proposed method to soft clay ground. In addition, a series of standard penetration tests (SPTs) were performed to assess the efficiency of each arrangement in improving the soft ground. It is noted from the in-situ test results that the interval distances between injection holes and the elapse time for ground stabilization are the crucial factors governing the applicability of the simultaneous multiple compaction-grouting method to improve the soft clay ground. |