高速铁路桩网结构加筋垫层变形影响因素研究

摘要

通过理论分析和有限元计算,对各种条件下桩网结构加筋垫层受力和变形进行系统分析,获得桩网结构体系中加筋垫层的受力变形特点和应力分布传递规律.加筋垫层对桩网结构桩、土应力分配影响明显,进而对桩网结构的整体受力扣变形产生影响.研究了影响加筋垫层变形的主要因素,计算不同条件下垫层变形的规律,并结合桩头结构形式,分析垫层变形的特点.结合不同桩体结构与加筋垫层的相互作用机理,分析不同垫层结构及加筋体特性对加筋垫层荷载传递的影响规律.结合室内缩比例模型试验,验证了计算结果的可靠性和准确性.%Based on theoretical analysis and finite element calculation,the stress and deformation of pile-net structure reinforced bedding under different conditions were analyzed systematically to obtain the deformation characteristics and stress distribution and transfer law.The reinforced bedding had obvious influence on the stress distribution between pile and soil,which could effect the global stress and deformation distribution of the pile-net structure.The main influence factors of deformation of reinforced bedding were studied,the law of deformation under different conditions were calculated.Combination with the interaction mechanism of different pile structures with reinforced beddings,the influence of different bedding structures and the characteristics of reinforcement on the load transfer of reinforced bedding were analyzed.The simulation results were verified by the in-door model test to prove the effectiveness and accuracy of simulation results.