Drilled Shaft Grouting Effectiveness in Mekong Delta

Abstract

In recent years, the post shaft-grouting technique has been used prevailingly for improving the drilled shaft bearing capacity of the high-rise building foundation projects in Mekong River basin of Vietnam. However, the effectiveness of the post shaft-grouting works for the drilled shafts is rarely obtained as expected. This paper will present results of bidirectional tests on the non-grouted and grouted shafts of the Lancaster Lincoln high-rise building project in Ho Chi Minh City, Vietnam, performed in 2016. The test shafts had diameter of 1.5 m and were constructed to 85 m depth below ground surface. The shaft grouting was performed along about 49 m above the drilled shaft toe level. The bidirectional load test results and the analysis shows that the unit shaft resistances of the sand and clay layers were increased about 150 and 300 percent after grouting, respectively.