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根据轴对称固结模型,推导出瞬时加荷刚性基础下劲性搅拌桩复合地基的固结方程,基于双层地基一维固结理论建立了固结解析解。通过与有限元法计算的固结度进行比较,证明了解析解的正确性和有效性。利用建立的固结解析解对劲性搅拌桩复合地基的固结特性进行了分析。结果表明,劲性搅拌桩复合地基的固结速率远大于传统的水泥搅拌桩复合地基,它随芯桩芯长比、劲性搅拌桩置换率和水泥搅拌桩外壳压缩模量的增加而增大,芯桩弹性模量和截面含芯率对劲性搅拌桩复合地基固结速率的影响不大。
According to the axisymmetric consolidation model, the consolidation equation of the composite foundation with stiff mixing piles under transient loading stiffness is deduced. The analytical solution of consolidation is established based on the one-dimensional consolidation theory of double-layered soil. By comparing with the degree of consolidation calculated by the finite element method, the correctness and validity of the analytical solution are proved. The consolidation characteristics of the composite foundation with the stiff mixing piles were analyzed by using the established analytical solution. The results show that the consolidation rate of the composite foundation with stiff mixing piles is far greater than that of the traditional composite foundation with cement piles. The consolidation rate increases with the core-to-core ratio, the mixing ratio of the stiff mixing piles and the compressive modulus of the cement mixing piles The elastic modulus of core and the core content of cross section have little effect on the consolidation rate of the composite foundation with stiff mixing piles.