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Zhou J.-J.,Zhejiang University | Gong X.-N.,Zhejiang University | Wang K.-H.,Zhejiang University | Zhang R.-H.,ZDOON Building Material Group
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2014

A series of field tests and finite element software ABAQUS were used to investigate the behavior of the static drill rooted nodular pile under compression. The simulation results were assumed to be reliable through the comparison with the measured results. The simulation results showed that: the bearing capacity of the nodular pile is higher than the bearing capacity of the pipe pile when using the static drill rooted method; the bearing capacity of the composite pile decreases with the increasing distance of adjacent nodes, while the decrement value is small; the strength of the cemented soil along the shaft has little influence on the bearing capacity of the composite pile; the friction coefficient of the cemented soil-soil interface is an important factor for the behavior of the composite pile under compression; a reasonable range for the radius of the cemented soil is proposed in practical projects. Source


Zhou J.-J.,Zhejiang University | Wang K.-H.,Zhejiang University | Gong X.-N.,Zhejiang University | Zhang R.-H.,ZDOON Building Material Group
Journal of Zhejiang University: Science A | Year: 2013

The static drill rooted nodular pile is a new type of pile foundation consisting of precast nodular pile and the surrounding cemented soil. This composite pile has a relatively high bearing capacity and the mud pollution will be largely reduced during the construction process by using this type of pile. In order to investigate the bearing capacity and load transfer mechanism of this pile, a group of experiments were conducted to provide a comparison between this new pile and the bored pile. The axial force of a precast nodular pile was also measured by the strain gauges installed on the pile to analyze the distribution of the axial force of the nodular pile and the skin friction supported by the surrounding soil, then 3D models were built by using the ABAQUS finite element program to investigate the load transfer mechanism of this composite pile in detail. By combining the results of field tests and the finite element method, the outcome showed that the bearing capacity of a static drill rooted nodular pile is higher than the bored pile, and that this composite pile will form a double stress dispersion system which will not only confirm the strength of the pile, but also make the skin friction to be fully mobilized. The settlement of this composite pile is mainly controlled by the precast nodular pile; meanwhile, the nodular pile and the surrounding cemented soil can be considered as deformation compatibility during the loading process. The nodes on the nodular pile play an important role during the load transfer process, the shear strength of the interface between the cemented soil and the soil of the static drill rooted pile is larger than that of the bored pile. © 2013 Zhejiang University and Springer-Verlag Berlin Heidelberg. Source


Zhou J.,Zhejiang University | Gong X.,Zhejiang University | Wang K.,Zhejiang University | Zhang R.,ZDOON Building Material Group | Yan T.,ZDOON Building Material Group
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

The static drill rooted nodular pile has lots of advantages such as high bearing capacity, high technology content and environment protection. In the application to some soft soil areas in the southeastern coast of China, the construction costs of the nodular piles was decreased by 10% compared to that of the bored piles, and the mud emission was largely reduced by using the static drill rooted method. Through the analysis of a test pile, it is found that the skin friction of the nodular pile is about 1.05-1.10 times that of the bored pile, while the standard of the precast pile is more appropriate with calculating the pile tip resistance of the nodular pile, and a reduction coefficient is applied. Combining the result of test pile and the literatures as well as standard in Japan, a simplified calculation formula was proposed. In order to verify the reliability of the proposed formula, test nodular piles in two projects were calculated using the formula. The calculated results fit the test results well. Therefore, the proposed formula could provide some reference for the actual engineering. ©, 2014, Academia Sinica. All right reserved. Source

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