行车荷载作用下冲填土变形特性试验研究

本文以上海临港新城冲填土地层分布区的道路在车辆振动荷载作用下路基变形为研究对象,以一定的动应力、不同的振动频率来模拟车辆振动荷载,进行了振动三轴试验研究,试验结果表明:在固结比相同,振动幅值相同的情况下,轴向应变随着振动次数的增加呈线性增大;轴向应变随孔隙水压力的增加先缓慢增长,当孔压比达到一定值后,轴向应变会迅速增加,直到破坏;轴向应变与剪应变和径向应变呈良好的线性关系。

DEFORMATION CHARACTERISTICS OF HYDRAULIC FILL UNDER TRAFFIC LOADING IN SHANGHAI

The deformation characteristic of hydraulic fill in Shanghai is studied in this paper. The roadbed made of hydraulic fill can be deformed & liquefied under the traveling traffic loading. The same dynamic stress, different dynamic frequency are adopted to simulate the traveling traffic loading. Hydraulic fill is tested by dynamic triaxial experiment. Through the analysis of these test results, the following conclusions are drawn. With the same consolidation ratio & swing, axial strain increases linearly with increasing vibration times. the axial strain increases slowly in the start of increasing pore water pressure. When pore water pressure ratio reaches the certain value,the axial strain increases quickly up to destroy. The relation between the axial strain and the radial strain and the shear strain is linear. Results of tests supply valuable reference to design, construction of roadbed and avoid disaster of engineering geological in hydraulic fill of Shanghai.