车辆荷载对不同压实度黏土路堤沉降的影响

Influence of Vehicle Loads on Settlement of Clay Embankment with Different Compaction Degree

施工期重车和运营期行车荷载会影响填土路堤的沉降变形,可能导致路面病害的产生。采用数值模拟对某高速公路坡残积土地基上的不同压实度的黏土填方路堤在施工期重车和运营期行车荷载作用下的沉降变形进行分析。结果表明:施工期重车作用后路堤最大沉降量增大80.8%~103.4%,堤身最大相对沉降量增大125.1%~163.6%,且随压实度的增大而减小。运营期行车荷载产生的路堤最大沉降量和堤身最大相对沉降量增量分别为23.6%~31.1%和27.2%~73.6%。压实度越大,路堤变形受车辆荷载的影响越小,且车辆荷载对堤身压缩量的影响大于对地基的影响。

The heavy vehicle load during construction and traffic load in operation period can influence the settlement of filled embankment,and may lead to the occurrence of roadbed diseases.The settlement of a highway’s embankment with different compaction degree filled on the slope and residual soil under heavy vehicle load during construction and traffic load in operation period were analyzed using numerical simulation.The results show that the maximum settlement of the embankment with the heavy vehicle load at completion increased 80.8%~103.4%.The maximum relative settlement of the embankment itself increased 125.1%~163.6%and decreased with the increasing compaction degree.In operation period the increments of the maximum settlement of the embankment and the maximum relative settlement of the embankment itself caused by traffic load are 23.6%~31.1%and 27.2%~73.6%,respectively.The greater is the compaction degree,the less is the influence of vehicle loads on the embankment settlement.Furthermore,the influence of vehicle loads on the settlement of the embankment itself is greater than that on the settlement of the foundation.