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在分析桩土相互作用的基础上,将柔性桩和天然地基形成的复合地基当作刚性桩的等效天然地基,考虑垫层效应,推导了复合地基在弹性工作阶段桩土的荷载分担比及沉降的解析解,利用解析解编制程序分析长、短桩弹性模量对桩土荷载分担比的影响。分析表明,随长桩弹性模量的增大,长桩的荷载分担比增大,短桩及桩间土的荷载分担比减小,但长桩的弹性模量大于28 000MPa时,其对桩土的荷载分担比影响较小;随短桩弹性模量的增大,长桩的荷载分担比减小,短桩及桩间土的荷载分担比增大。
Based on the analysis of pile-soil interaction, the composite foundation formed by flexible piles and natural foundation is regarded as the equivalent natural foundation of rigid piles. Considering the effect of cushion, the load-sharing ratio of pile-soil in elastic working stage is deduced. Analytical solution of settlement, analytic solution program for the analysis of long and short pile elastic modulus of the load-sharing ratio of pile-soil impact. The analysis shows that with the increase of the elastic modulus of long piles, the load sharing ratio of long piles increases, while the load sharing ratio of short piles and piles decreases. However, when the elastic modulus of long piles is more than 28 000 MPa, With the increase of short-pile elastic modulus, the load sharing ratio of long piles decreases and the load-sharing ratio of short piles and inter-piles increases.