土钉桩抗拔承载性能试验与仿真分析研究

土钉桩复合结构是一种新型桩。为了探求土钉桩结构的抗拔承载性能，本研究进行了模型桩现场抗拔试验，并采用了三维有限元数值仿真技术，分析研究了土钉桩结构的抗拔性能，验证了数值仿真结果的可靠性。Goodman接触面单元用来模拟桩和土之间的接触，梁单元用来模拟土钉。基于弹塑性理论建立了土的应力应变关系。采用ANSYS分析了桩-土钉-土之间的相互作用问题。与裸桩进行对比，试验结果和数值结果都表明土钉桩结构具有很好的抗拔承载性能。本文研究为这种新型桩在今后的设计和应用具有一定的现实指导意义。

Research on uplift bearing capacity of the pile-nail with field-testing and numerical sinulation

The composite structure of pile-soil nail is a new uplift pile. The 3D-finite element numerical simulation was adopted to study the uplift bearing capacity of the Pile-Nail composite structure. Goodman＇s contact interface element is used to simulate behavior of soil and pile interaction. Beam element is used to simulate Nail. The stress-strain of soil is established based on elastoplasticity theory. The pile-soil nail-soil interaction is analyzed by software ANSYS. The field-test results and numerical results show that pile-nail composite structure has good uplift bearing capacity compared with pile structure. The research on uplift bearing capacity of pile-nail composite structure can be used to guide the design and construction of pile-nail composite structure.