【摘要】 为了掌握在列车荷载作用下无碴轨道桩板结构路基的工作性状,以遂渝高速铁路为背景,通过室内大比例动态模型试验,加载频率为5 Hz,激振20万次,研究了桩板结构路基桩-土工作特性变化规律。试验结果表明:在荷载激振1万次后,动位移幅值、桩身轴力、桩间土动应力随着振动次数的增加几乎不变,桩-土共同作用趋于稳定;桩间土的动应力沿深度近似呈"K"形分布,与土体相比,桩分担了大多数动力荷载,激振位置对动应力有影响;桩基加深了基床的动力影响范围,改善了路基土体的受力状态。更多还原

【Abstract】 In order to investigate the mechanical behavior of pile-plank embankment for high-speed ballastless track under moving load,based on Suining-Chongqing High-speed Railway,the pile-soil interaction characteristics of pile-plank embankment were researched by indoor great scale dynamic model test,in which the loading frequency is 5 Hz and the loading times are 2×105.Test result indicates that the amplitude of dynamic displacement,pile shaft force,dynamic stress in soil between piles remain constant after 1×104 times of vibrant loading,and pile-soil interaction tends toward stability.The amplitude curve of dynamic stress is approximately "K" form with the depth in soil between piles,piles share most dynamic stress compared with soil,and dynamic stress is affected by loading position.Pile structure expands the depth of the dynamic response of roadbed and improves the stress state of roadbed soil.1 tab,7 figs,11 refs.更多还原