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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  

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)
Publication Information
Geomechanics and Engineering / v.10, no.4, 2016 , pp. 527-546 More about this Journal
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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