Settlement Restraint of Soft Ground by Low Slump Mortar Injection

저유동설 몰탈주입에 의한 연약지반의 침하억제 효과

  • 천병식 (한양대학교 공과대학 토목공학과) ;
  • 여유현 (한국해양대학교 공과대학 토목공학과) ;
  • 정영교 (덴코리아 그라우팅(주) 대표이사)
  • Published : 2001.12.01

Abstract

In this study the pilot test of CGS as injection method by low slump mortar was performed and the results were analyzed in order to find out the application of this method and effect of settlement restraint. The site far pilot test is adjacent to apartments supported by pile foundations. Sand drain method was performed previously as countermeasures against settlement, but settlement occur continuously because this ground is very soft. Site investigations such as SPT, DCPT and vane shear test were performed to determine the characteristics of ground improvement. Field measurements and FDM analysis were performed on purpose to find out the displacement of ground during injection works. From the results of this study, CGS method can be optimized by the control of diagram, space, depth, injection material, and injection pressure. CGS improved soft ground compositely by the bearing effect of CGS columns and reinforcement of adjacent ground. Considering that increase of N value is about 2.1, CGS can be considered as an effective method to increase the bearing capacity as well as to stop the settlement of soft ground. It is also expected to be economic and effective in improvement of ground when it is used in applicable sites.

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