| Title |
Evaluation of the Shaft Resistance of Drilled-in Steel Tubular Pile in Rock Depending on the Proportion of Annulus Grouting Material |
| Authors |
문경태(Moon, Kyoungtae) ; 박상렬(Park, Sangyeol) |
| DOI |
https://doi.org/10.12652/Ksce.2018.38.1.0051 |
| Keywords |
매입말뚝;주면지지력;주면고정액;배합비;시멘트풀;모르타르 Drilled-in pile;Shaft resistance;Grouting material;Mix proportion;Cement paste;Mortar |
| Abstract |
Foundation of tower structures such as wind turbine, pylon, and chimney have to resist considerably large overturning moment due to long distance from foundations to load point and large horizontal load. Pile foundations subjected to uplift force are needed to economically support such structure even in the case of rock layer. Therefore, this research performed the laboratory model tests with the variables, W/C ratio and sand proportion, to evaluate the effect of the mix proportion of grouting material on shaft resistance. In the case of cement paste, maximum and residual shaft resistance were distributed in uniform range irrespective of the changes of W/C ratio. However in the case of mortar, they were decreased with increasing W/C ratio, while they were increased and then decreased with increasing sand proportion. In the case of no sand, the maximum shaft resistance was about 540~560kPa regardless of the W/C ratio. When the sand proportion was 40%, it was about 770~870kPa depending on W/C ratio, which was about 40~50% higher than that without sand. The optimum proportion found in this research was around 40% of sand proportion and 80~100% of W/C ratio. |