【摘要】 为探讨水平受荷桩的非线性桩-土相互作用关系,考虑桩侧土体的应力分布规律,先求得桩侧土体的最大径向正应力(剪应力τrθ=0),再通过应力边界条件求解桩侧土体应力平衡微分方程,得到桩-土界面上的土体应力增量解答,据此求解桩侧土抗力,同时考虑土体纵向应力改变对土抗力的影响,最终建立基于桩侧土体应力状态的单桩p-y曲线模型。通过与已有试验结果的对比分析,验证所得p-y曲线的合理性与可行性。研究结果表明:黏聚力c=0时,桩侧土抗力极限值Pu沿深度近似线性增大,且内摩擦角φ由27.5°增至40°时各深度处Pu约增大0.8倍;弹性模量参数m由150增至400时,各深度处的Pu增大约0.4倍,但增幅随m增大而逐渐减小。此外,φ=0时,Pu沿深度增大的速率随深度增加而迅速减小,且c由2k Pa增至10 kPa时各深度处Pu增大约3～4倍。更多还原

【Abstract】 To discuss the no-linear interaction between horizontal loaded pile and subsoil, the maximum radial stress of the surrounding subsoil(shear stress τrθ=0) was first obtained by considering the stress distribution of the soil. Then, the stress equilibrium differential equation of the soil around the pile shaft was solved by introducing the stress boundary condition, and the stress increment solution of soil along the pile-soil interface was given to analyze the lateral resistance of soil around the pile shaft. The effect of longitudinal stress change on soil resistance was also considered to set up the p-y curve of monopile foundation based on stress state of soil. Finally, the solutions from the presented p-y curve were verified by comparing the calculated results with the available experimental data. Furthermore, a detailed parameter analysis shows that, if the cohesion c equal to 0, the ultimate lateral resistance of soil around the pile shaft Pu increases almost linearly along the depth and the increase of φ from 27.5° to 40° results in the 1.8 times value of Pu; the increase of elastic modulus coefficient m from 150 to 400 results in the 1.4 times value of Pu, while the increasing rate of Pu decreases gradually as the m increases. On the other hand, if the φ equal to 0, the increasing rate of Pu along the depth decreases rapidly and the increase of c from 2 kPa to 10 kPa results in a 3～4 times increase of Pu.更多还原