TY - JOUR
T1 - Field load tests on plastic tube cast-in-place concrete piles
AU - Qi, Chang Guang
AU - Chen, Yong Hui
AU - Iskander, Magued
N1 - Funding Information:
The authors would like to acknowledge the scholarship awarded to the first author by the China Scholarship Council to study at New York University for 1 year. The work was also sponsored by the Qing Lan Project and the National Natural Science Foundation of China (Project No. 51178160).
Publisher Copyright:
© ICE Publishing 2016, all rights reserved.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - An instrumented axial load test programme was conducted to study the load transfer behaviour of plastic tube cast-inplace concrete piles (TC piles), which are increasingly being used for support of embankments over soft ground in China. Additionally, in order to enhance the bearing properties of TC piles, the effects of shaft pre-grouting and increasing the diameter of the pile were investigated through load tests. Grouting was found to increase the capacity by 8–20%, while settlement decreased by 20–36%. Additionally, increasing the diameter from 16 to 20 cm resulted in a 10–17% decrease in capacity, due to the accompanying decrease in pile length to accommodate the capabilities of the available construction equipment. Also, increasing the diameter increased settlement by 14–33%. The effect of the pile set-up was investigated, and the capacity was increased by 20%, 8% and 11% for TC piles, gravity-grouted piles and enlarged-diameter piles for axial load tests conducted after 105 d relative to tests conducted after 24 d. In addition, three calculation models of single-pile settlement were evaluated with respect to predictions made of the bearing capacity and settlement.
AB - An instrumented axial load test programme was conducted to study the load transfer behaviour of plastic tube cast-inplace concrete piles (TC piles), which are increasingly being used for support of embankments over soft ground in China. Additionally, in order to enhance the bearing properties of TC piles, the effects of shaft pre-grouting and increasing the diameter of the pile were investigated through load tests. Grouting was found to increase the capacity by 8–20%, while settlement decreased by 20–36%. Additionally, increasing the diameter from 16 to 20 cm resulted in a 10–17% decrease in capacity, due to the accompanying decrease in pile length to accommodate the capabilities of the available construction equipment. Also, increasing the diameter increased settlement by 14–33%. The effect of the pile set-up was investigated, and the capacity was increased by 20%, 8% and 11% for TC piles, gravity-grouted piles and enlarged-diameter piles for axial load tests conducted after 105 d relative to tests conducted after 24 d. In addition, three calculation models of single-pile settlement were evaluated with respect to predictions made of the bearing capacity and settlement.
KW - Field testing & monitoring
KW - Grouting
KW - Piles & piling
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U2 - 10.1680/grim.13.00053
DO - 10.1680/grim.13.00053
M3 - Article
AN - SCOPUS:84955080673
SN - 1755-0750
VL - 169
SP - 9
EP - 21
JO - Proceedings of the Institution of Civil Engineers: Ground Improvement
JF - Proceedings of the Institution of Civil Engineers: Ground Improvement
IS - 1
ER -