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

  • Chang, Muhsiung ;
  • Mao, Tze-wen ;
  • Huang, Ren-chung
  • Received : 2014.09.18
  • Accepted : 2016.01.24
  • Published : 2016.04.25

Abstract

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.

Keywords

ground improvement;geotechnical properties;soil grouting;laboratory testing;field testing

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Acknowledgement

Supported by : National Science Council of Taiwan, Diffisoil Geotechnical Engineering Co., National Yunlin University of Science & Technology (NYUST) of Taiwan