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

作者：Chang Muhsiung^*; Mao Tze wen; Huang Ren chung

来源：Geomechanics and Engineering, 2016, 10(4): 527-546.

DOI：10.12989/gae.2016.10.4.527

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

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 similar to 15 kPa, and the friction angle appeared unaffected. The grouting had also improved the cohesion of the on-site SM soils by 10 similar to 90 kPa, while influences on the friction angle of soils were uncertain. Liquefaction resistances could be enhanced for the sandy soils within a 2 similar to 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.

• 出版日期2016-4