Effect of Compaction Grouting on Mechanical Properties of Soils

• Main Authors: Cheng-Hsiung Liu, 劉正雄
• Other Authors: Hung-Jiun Liao
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/62793229827510661864

碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 81 === A 2-D laboratory model test and a full scale field test were adopted to study the deformation characteristics of soil around the grout bulb generated by the compaction grouting method. It was found that if the soil was not homogeneously deposited, the grout bulb tended to develop first toward the soil with lower strength before a more homogeneous soil mass has been achieved. This phenomenon was confirmed by the field test. The degree of strength improvement of the soil tended to decrease with the dis- tance from the injection point. The weaker the original shear strength, the higher the degree of strength impro- vement can be obtained. However, the UUU triaxial test results also indicated that the area of influence did not increase unlimitedly with the volume of grout being injected into the soil. No obvious increase in the grout bulb in- fluenced area was observed when the radius of the influenced area was more than three times as large as that of the grout bulb. However, the degree of strength improvement for the soil within the influenced area was found to increase with the volume of injected grout. Field test results showed that the SPT blow counts for the soil in between the neighboring injecting points could be increased as much as 150~200% if the infecting points were properly layouted and certain the water pressure dissipation pipes were installed.