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为揭示疏桩支撑路基结构的荷载传递机理,针对疏桩作用路基的荷载效应特点,基于剪切位移分析法原理和大桩群单元简化模型,提出了疏桩支撑路基内部的荷载传递剪切位移分析模型;通过假定单元模型内、外土柱界面剪切力与对应相对位移的理想弹塑性关系,结合广义剪切位移概念,推导了路基单元模型的荷载传递控制方程,进而考虑疏桩路基中路基-垫层双层结构特点,建立了双层体系下路基荷载传递的剪切位移解析解。研究结果表明:所提出的模型在疏桩路基中具有较好的适用性,可拓展应用于分离式桩筏基础的桩土荷载效应分析。
In order to reveal the load transfer mechanism of sparse pile supporting embankment, aiming at the load effect characteristics of sparse pile subgrade, based on the principle of shear displacement analysis and simplified model of large pile group unit, the load transfer shear displacement Through the ideal elastoplastic relationship between shear force and corresponding relative displacement of inner and outer soil columns and the concept of generalized shear displacement, the load transfer governing equations of subgrade element model are deduced. Then, Subgrade-cushion double-layer structure, the analytic solution of shear displacement of subgrade load transfer under two-layer system is established. The results show that the proposed model has good applicability in sparse pile embankment and can be applied to the analysis of pile-soil load effect of split piled raft foundation.