循环荷载作用下基床填料累积变形演化状态特征及试验验证  

Characteristics of Cumulative Deformation Evolution State of Subgrade Filler Under Cyclic Loading and Experimental Verification

作　　者：罗强[1] 刘钢[2,3] 张良[1] 蒋良潍[1] 熊勇[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]西华大学建筑与土木学院,四川成都610039 [3]西南交通大学道路工程四川省重点实验室,四川成都610031

出　　处：《铁道学报》2016年第7期110-116,共7页Journal of the China Railway Society

基　　金：国家重点基础研究发展计划(973计划)(2013CB036204);国家自然科学基金(51408491);西华大学自然科学重点基金(z1410602);道路工程四川省重点实验室2012年度开放自然科学基金(LHTE006201306)

摘　　要：为实现对高速铁路基床结构累积变形的有效控制,开展了循环荷载作用下土工填料累积变形演化状态特征分析,提出了土工填料累积变形状态随循环荷载水平的增加将呈现出快速稳定、缓慢稳定、缓慢破坏和快速破坏4种类型,建立了基于累积变形速率发展趋势、采用负幂函数表达的数学判别准则(幂次判别法)。通过构筑的单元结构填土模型,实现了小型刚性平板循环加载下模型填土累积变形4种状态的全过程模拟,并获得了相应的3个荷载阈值。针对高速铁路无砟和有砟轨道系统在适应基础结构沉降方面的巨大差异,明确了基床结构需分别满足快速稳定和长期稳定变形状态的控制原则及技术条件。所得成果为构建高速铁路基床结构变形状态控制设计技术提供了理论和试验依据。For the purpose of realizing the effective control of the cumulative deformation of high-speed railway subgrade,the characteristics of cumulative deformation evolution state of subgrade filler under cyclic loading have been analyzed.Four categories of the status of the cumulative deformation evolution of the subgrade filler with the change of cylic loading levels will appear,including immediate stabilization,gradual stabilization,gradual damage and immediate damage.Whats more,the mathematical criteria were built based on the development of the cumulative deformation rate with the increasing of load times,which was described by the negative power function.Through the construction of the element filler model,the whole process simulation of the four states of the cumulative deformation of the model under the cyclic loading was realized,and three corresponding load thresholds were obtained.In view of the great difference of the ballastless and ballast track systems of high speed railway in adapting to the settlement of the foundation structure,the deformation control principles and technical conditions of the subgrade structures of the ballast and ballastless tracks to meet the long-term stabbility and fast stability were specified.The results privide a theoretical and experimental basis for the deformation control design of high-speed railway subgrade structures.

关 键 词：高速铁路 基床结构 循环荷载 累积变形状态 幂次判别法 模型试验 

分 类 号：TU47[建筑科学—结构工程]