杭嘉湖平原软土地区某高速公路软基处理评价

EVALUATION OF SOFT SOIL FOUNDATION TREATMENT OF A HIGHWAY IN SOFT SOIL AREA OF HANGJIAHU PLAIN

针对杭嘉湖平原区某高速公路,研究了不同软基处理方式的应用情况,并根据沉降监测数据进行理论预测分析,给出了各种软基处理方式处理效果的定量评价分析方法与评价结果。研究表明杭嘉湖平原地区广泛分布中浅层软土;在一般路段应用塑料排水板堆载预压法十分普遍,且当预压期充足时,处理效果较优;水泥搅拌桩和塑料套管桩在桥头路段的的处理效果并不理想;预应力管桩在结构与非结构路段都取得了较好的处理效果。研究成果可为今后类似项目的软基处理方案选择提供参考和借鉴。

The application of soft soil foundation treatments for a highway in Hangjiahu Plain was studied.An analy⁃sis of theoretical prediction was carried out based on the monitoring data of ground settlement,based on which an analysis method of quantitative evaluation was illustrated,as well as the evaluation results of the treatment effects of various soft foundation treatments.The result shows that the soft clay is widely distributed in the middle-shallow lay⁃er of Hangjiahu Plain.The preloading method with plastic drainage plates is widely used in most parts of the high⁃way,and it has better effect when the preload period is sufficient.The treatment effect of cement mixing piles and plastic casing piles at the bridgehead is not satisfactory.Prestressed pipe piles show good performance in both struc⁃tural and non-structural sections.The research results may provide a reference for the selection of soft soil founda⁃tion treatments in similar projects in the future.