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根据Chai和Miura(2002)提出的考虑软土初始静偏应力影响的塑性累积变形计算模型,采用淮安填土的静态和动态力学参数,对金-马高速公路低路堤路基在交通荷载下的累积沉降进行了计算分析。计算结果表明:累低路堤路基累积沉降随时间先急剧增大,然后逐渐变缓;随着车流量增加,路基累积沉降增加,车流量超过2 000辆/天,路基累积沉降增加速度加快;车载越大,累积沉降增大速度越快,车载超过30 t,累积沉降增加速度加快;随着路堤高度减小,地基累积沉降快速增加很快,路堤高度小于3 m的路基沉降增加更加快;随着地下水埋深增加,路基累积沉降减小,地下水的季节性变化导致路基累积沉降季节性变化。重交通和超载车辆对路基累积沉降影响显著。
According to the calculation model of plastic cumulative deformation considering the influence of the initial static deviatoric stress of soft soil proposed by Chai and Miura (2002), the static and dynamic mechanical parameters of Huai’an earth fill are used to calculate the accumulation of low embankment of Jin-Ma freeway under traffic load Settlement has been calculated and analyzed. The calculation results show that the accumulative settlement of the road embankment accumulates sharply and then gradually decreases with the passage of time. With the increase of the traffic flow, the cumulative settlement of the embankment increases with an increase of over 2,000 vehicles / day, and the cumulative settlement of subgrade accelerates. As the embankment height decreases, the cumulative settlement of ground quickly increases rapidly, and the settlement of embankment with embankment height less than 3 m increases more rapidly; with the increase of embankment height, With the increase of groundwater depth, the cumulative subsidence of subgrade is reduced, and the seasonal variation of groundwater leads to the seasonal change of subgrade settlement. Heavy traffic and overloaded vehicles have a significant impact on subgrade settlement.