Additional stress analysis of upper soil between piles in rigid pile-net composite foundation

作者：Liu Junfei^*; Zhao Jian; Zhao Guotang; Ma Jianlin; Li Huajian

来源：China Railway Science, 2011, 32(2): 15-19.

• Additional stress
• Axial forces
• Axially symmetric
• Calculation methods
• CFG pile
• Cylindrical coordinates
• Decay rate
• Field test
• Friction angles
• Negative friction
• Numerical simulation
• Pile caps
• Pile composite foundation
• Pile soil interaction
• Pile-net composite foundation
• Rigid piles
• Shearing force
• Single piles
• Soil stress
• Treatment area

Combining with the field test of CFG pile-net composite foundation, the additional soil stress of upper soil between piles was analyzed. The test shows that the soil stress of upper soil is just increased in a certain range of depth, while the additional soil stress decreases quickly with depth and the axial force of upper pile increases with depth. Using axially symmetric cylindrical coordinate, for rigid-pile composite foundation without pile cap, the pile-soil interaction in the treatment area of single pile is analyzed, and a calculation method of additional stress in the upper soil of pile-net composite foundation is created. The results show that, under the action of the shearing force in the soil and friction among pile and soil, the load supported by pile and soil is redistributed. The load supported by soil is decreased and the load supported by pile is increased. The larger the cohesion and friction angle of soil is, the faster the decay rate of the additional stress of soil will be. By comparing the calculation value with the result of numerical simulation and field test, it shows that the calculation method proposed in this paper is reliable.

• 出版日期2011
• 单位西南交通大学