京哈高速沈阳至四平段改扩建之蒲河立交区软土地基处理方案论证

Project Demonstration on Treatment for Soft Soil Foundation of Puhe Overpass Area in Reconstruction and Extension of Shenyang-Siping Section of Jingha Expressway

立交区内主线加宽部位存在第四系(Q4)沉积地层的草炭土,厚0.4~7.9m,具有高压缩性、高含水量、大孔隙比等特点,路基填筑后新老路基产生较大差异沉降量,后期运营中易引起路面开裂等病害,影响行车舒适度、危及行车安全、增加养护费用,需采取有效措施进行处理。通过对加宽段地质条件的准确把握,对稳定性、工后差异沉降等进行计算分析,结合工程实际进行方案比选,最终得出合理有效的处治方案。

The widening part of mainline in overpass area has turf soil of sedimentary strata of quaternary system(Q4),which is 0.4~7.9m thick,with features like high compressibility,high water content,ratio of great pore and so on.The large differential settlement that is produced by new and old subgrade after subgrade filling,and diseases like pavement cracking in the post-stage operation may influence the driving comfort,imperil the driving safety,and increase the maintenance expense,so it is necessary to take effective measures to dispose.Through the accurate grasp of geological conditions of widening section,the computational analysis on stability,differential settlement after construction and so on is made.In combination with practical project,the scheme comparison is made,so as to obtain reasonable and effective treatment schemes at last.