论文部分内容阅读
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。
In order to grasp the working characteristics of the ballastless track pile foundation under the train load, taking the Suiyu high-speed railway as the background, through the indoor large-scale dynamic model test, the loading frequency is 5 Hz and the excitation is 200,000 times. Structural Behavior of Subgrade and Pile - Soil Variation Law. The test results show that the amplitude of dynamic displacement, the axial force of pile and the dynamic stress of soil between piles hardly change with the increase of vibration frequency, and the interaction between pile and soil tends to be stable after 10000 times of load excitation. The dynamic stress is distributed in the shape of “K ” along the depth. Compared with the soil, the pile shares most of the dynamic load and the position of the vibration affects the dynamic stress. The pile foundation deepens the dynamic influence range of the bed and improves Subgrade soil stress state.