交通荷载下低路堤高速公路路基沉降计算

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。

Cumulative Settlement of Highway Subgrade with Low Embankment Induced by Traffic Load

Cumulative settlement of highway subgrade with low embankment of Jin-Ma highway induced by traffic load was calculated using the Chai & Miura model (2002), in which the plastic vertical strain in subsoil is calculated by an empirical equation, in which constants are related to the physical and mechanical properties of subsoil. It is shown that cumulative settlement increases sharply with time in opening stages of traffic and then gradually tends to be in stable state, and cumulative settlement increases rapidly with the increase of traffic flow (more than 2000 vehicles/day) and traffic weight (more than 30t), and the decrease of the road embankment height and the depth of underground water table. Seasonal change in the cumulative settlement occurred due to the seasonal change in depth of underground water table. The heavy traffic and overloaded vehicle affect the cumulative settlement sharply.