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| Study and development of caterpillar pile for reducing negative friction resistance and analysis of its mechanical properties |
| DONG Jianhua1，2，ZHENG Yalin1，2，WU Xiaolei1，2 |
(1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Western Engineering Research Center of Disaster Mitigation in Civil
Engineering of Ministry of Education，Lanzhou University of Technology，Lanzhou，Gansu 730050，China)
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Abstract Aiming at the problem of negative friction of pile foundation in collapsible loess area，a kind of crawler steel pipe pile is proposed，which can not only reduce the negative friction of pile side，but also increase the positive friction. Its structure and working principle are discussed. Based on the load transfer function and combined with the motion characteristics of the track，the load transfer method is modified according to the motion characteristics of the track，and the distribution functions of the positive and negative friction on the side of the pile，as well as the calculation formulas of the pile settlement and the soil settlement considering the time effect are derived，Finally，the calculation method of the vertical ultimate bearing capacity of the new pile is given. Combined with an example，the structural characteristics and working principle of the new pile are simulated by using the nonlinear finite element software ABAQUS，and the simulated value is compared with the theoretical value. The indoor model test of new type pile and common pile is carried out. The results show that：(1) The track can make the neutral point move up and reduce the negative friction on the pile side. (2) With the increase of the distance from the pile center，the smaller the settlement is，which is more conducive to the stability of the foundation. (3) The simulation results of single pile bearing capacity are basically consistent with the theoretical calculation results，which verifies the correctness of the theoretical analysis method. (4) Compared with the ordinary straight pile，the effect of reducing negative friction is obvious，and the bearing capacity of single pile is improved，which provides certain theoretical guidance for the design of pile foundation projects in collapsible loess areas.
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2023, Vol. 42 
