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实现长期循环荷载作用下基床结构累积变形有效控制是建造高速铁路的技术难点之一.基于高速铁路无砟与有砟轨道路基承受列车动荷载特征,提出和完善了用于基床结构设计的荷载作用模式;根据循环荷载作用下土工填料累积变形演化状态的分类及阈值判别准则,结合室内单元结构填土模型试验,获得了级配碎石基床填料变形状态演化的阈值参数.以设计荷载条件和填料设计参数为基础,针对无砟与有砟轨道对基床变形状态控制的不同要求,采用结构分析原理,构建了基于累积变形演化状态控制的高速铁路基床结构设计计算方法,确定了无砟与有砟轨道基床结构累积变形分别满足快速稳定和缓慢稳定的状态控制要求,以地基系数K30值表征的关键参数指标.研究成果为实现高速铁路基床结构由构造设计向状态控制定值分析转变奠定了基础.
The effective control of cumulative deformation of the bed structure under long-term cyclic loading is one of the technical difficulties in constructing high-speed railway.According to the characteristics of dynamic load on unmanned and ballasted high-speed railway embankment, According to the classification and threshold criterion of cumulative deformation evolution of geotextile under cyclic loading, the threshold parameters of deformation state evolution of graded macadam base were obtained by combining with the model tests of indoor unit filling, According to the different requirements of ballastless and ballasted track on deformation control of foundation bed, structural calculation principle is used to design and calculate the structure design of high-speed railway subgrade based on cumulative deformation evolutionary state control. The cumulative deformation of ballastless bed and ballastless bed structure respectively meets the requirements of fast and stable state control and the key parameters indexed by the foundation coefficient K30.The research results are from the structural design to state control of high speed railway subgrade structure The shift in value analysis lays the foundation.