车辆荷载作用下冲填土的孔压发展试验研究  

Study on Pore Water Pressure of Hydraulic Fill under Traffic Loading

作　　者：杨坪[1] 唐益群[1] 周念清[1] 王建秀[1] 严学新[2] 王寒梅[2] 

机构地区：[1]同济大学岩土工程重点实验室 [2]上海市地质调查研究院,上海200072

出　　处：《地下空间与工程学报》2008年第2期253-258,340,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金资助项目(40372124);上海市博士后科研基金资助项目(05R214145)

摘　　要：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、破坏时孔隙水压力发展规律为研究对象,以不同的振动频率和动应力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:在相同固结比,不同振动频率和振幅情况下,孔隙水压力随着振动次数的增加而增大,在开始振动的前一段时间,孔隙水压力增加较快,但当振动次数比达到0.2以后,孔隙水压力增加比前一段时慢,但会一直持续增加,直到液化破坏。冲填土在低频率和高频率车辆振动荷载作用下孔隙水压力的发展模式不同,低频率下孔隙水压力的发展规律可以用多项式进行模拟;高频率下孔隙水压力的发展规律可以用幂指数模型进行模拟。本研究成果为上海临港新城冲填土地层分布区的道路路基的设计、施工以及防止工程地质灾害的发生提供了有价值的参考。The pore water pressure of hydraulic fill in Shanghai Newport town was studied in this paper when the roadbed deformed ＆ liquefied under the traveling traffic loading. The different dynamic frequency ＆ dynamic stress is adopted to simulate the traveling traffic loading. The hydraulic fill was tested by dynamic triaxial experiment. Through the analysis of these test results, the following conclusions have been drawn： With the same consolidation ratio, different dynamic frequency and swing, the pore water pressure increases with dynamic times. The pore water pressure increases quickly in the former period of dynamic time ; when dynamic time ratio reach 0.2, the pore water pressure increases slowly up to the destroy of the road. The development of pore water pressure under low dynamic frequency of traveling traffic loading is different from that under high one. The pore water pressure curve under low dynamic frequency of traveling traffic loading can be fitted by Cubic, the pore water pressure curve under high dynamic frequency of traveling traffic loading can be fitted by Power index. Results of research supply valuable reference to design, construction of roadbed and prevention of engineering geological disaster in hydraulic fill of Shanghai Newport town.

关 键 词：车辆振动荷载 冲填土 动三轴试验 孔隙水压力 

分 类 号：TU435[建筑科学—岩土工程]