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Geomechanics and Engineering
  Volume 10, Number 4, April 2016, pages 527-546
DOI: http://dx.doi.org/10.12989/gae.2016.10.4.527
 


A study on the improvements of geotechnical properties of in-situ soils by grouting
Muhsiung Chang, Tze-wen Mao and Ren-chung Huang

 
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 ≥ 7.5, respectively, by the grouting.
 
Key Words
    ground improvement; geotechnical properties; soil grouting; laboratory testing; field testing
 
Address
Construction Engineering Department, National Yunlin University of Science & Technology, Taiwan.
 

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