某城市道路深厚软土路基沉降计算及对比分析

某城市新区滨海主次干道沿线均为深厚软土路基,软土层平均厚度超过20m,路基填筑高度2.0～8.0m。为控制工后沉降对道路正常使用的影响,设计时需选取可靠的沉降计算方法,确保工后沉降能够满足设计要求。本文对采用真空联合堆载预压法处治的道路先行段分别采用分层总和法和有限元方法进行了沉降计算,比对计算及实测结果表明,有限元计算结果与实测结果更为吻合,能够为路基处治方案的设计优化提供可靠的参考依据。

Settlement calculation and comparative analysis of deep soft soil roadbed for certain urban road

Along the primary and secondary coastal roads in certain urban new area,the deep soft soil exists in the roadbeds.The average thickness of the soft soil is more than 20m,and the height of the subgrade filling is about 2.0~8.0m.The reliable settlement calculation results are needed to control the influence of post-construction settlement on the normal application of the road in the process of designing.The most settlement of the soft soil layer could be controlled in the construction period to ensure the post-construction settlement to meet the requirement.The layer wise summation method and the finite element method are utilized for the settlement calculation of the test section which was treated by using the method of vacuum-surcharge preloading.By comparing the calculating results and the field monitoring data,the results from the finite element method is more consistent with the monitoring data,which could provide the reliable reference for the optimization design of the subgrade.