Numerical simulation on behavior of static drill rooted pile under tension
ZHOU Jia jin1,2, WANG Kui hua1,2, GONG Xiao nan1,2, ZHANG Ri hong3,YAN Tian long3
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China,2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China; 3. ZCONE High tech Pile Industry Holdings Company Limited, Ningbo 315000, China
A group of field tests and finite element software ABAQUS were used to investigate the uplift bearing capacity of the static drill rooted nodular pile. The numerical simulation result was verified to be reliable by being compared to the measured results. The simulation results show that the load displacement curve of the static drill rooted nodular pile under tension appears to be stable because of the existence of the enlarged pile base, moreover, the curve becomes more flat with the diameter of the enlarged pile base increasing. The modulus of the cemented soil along the shaft and the cemented soil at the enlarged base both have little influence on the uplift bearing capacity of the static drill rooted nodular pile. The uplift bearing capacity of the static drill rooted nodular pile is supported mainly by the enlarged pile base in soft soil areas where the amount of the skin friction is small, and to increase the diameter of the drilling hole along the shaft will decrease the bearing capacity of the enlarged pile base. The height of the enlarged cemented soil base has little influence on the uplift bearing capacity of the static drill rooted nodular pile, while the uplift bearing capacity of the static drill rooted nodular pile will increase with the diameter of the enlarged pile base increasing. As a result, the diameter of the enlarged base can be amplified to 2 times of the diameter of the drilling hole along the shaft on condition that the strength of the cemented soil is guaranteed.
ZHOU Jia jin, WANG Kui hua, GONG Xiao nan, ZHANG Ri hong,YAN Tian long. Numerical simulation on behavior of static drill rooted pile under tension. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(11): 2135-2141.
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