Geomechanics and Engineering

  • 제10권4호
  • /
  • Pages.527-546
  • /
  • 2016
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A study on the improvements of geotechnical properties of in-situ soils by grouting

  • Chang, Muhsiung (Construction Engineering Department, National Yunlin University of Science & Technology) ;
  • Mao, Tze-wen (Construction Engineering Department, National Yunlin University of Science & Technology) ;
  • Huang, Ren-chung (Construction Engineering Department, National Yunlin University of Science & Technology)
  • 투고 : 2014.09.18
  • 심사 : 2016.01.24
  • 발행 : 2016.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper discusses improvements of compressibility, permeability, static and liquefaction strengths of in-situ soils by grouting. Both field testing and laboratory evaluation of the on-site samples were conducted. The improvement of soils was influenced by two main factors, i.e., the grout materials and the injection mechanisms introduced by the field grouting. On-site grout mapping revealed the major mechanism was fracturing accompanied with some permeation at deeper zones of sandy soils, where long-gel time suspension grout and solution grout were applied. The study found the compressibility and swelling potential of CL soils at a 0.5 m distance to grout hole could be reduced by 25% and 50%, respectively, due to the grouting. The effect on hydraulic conductivity of the CL soils appeared insignificant. The grouting slightly improved the cohesion of the CL soils by 10~15 kPa, and the friction angle appeared unaffected. The grouting had also improved the cohesion of the on-site SM soils by 10~90 kPa, while influences on the friction angle of soils were uncertain. Liquefaction resistances could be enhanced for the sandy soils within a 2~3 m extent to the grout hole. Average improvements of 40% and 20% on the liquefaction resistance were achievable for the sandy soils for earthquake magnitudes of 6 and ${\geq}7.5$, respectively, by the grouting.

키워드

과제정보

연구 과제 주관 기관 : National Science Council of Taiwan, Diffisoil Geotechnical Engineering Co., National Yunlin University of Science & Technology (NYUST) of Taiwan

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