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在软土地区进行高填方路堤施工时地基会产生较大的变形,需要在填筑施工过程中严密监测地基的变形和孔压变化情况。介绍了国外某软土地区高填方机场跑道的建设,通过现场监测获得了路堤填筑过程中地基沉降和孔隙水压力的变化规律。基于第一级堆载预压获得的监测数据,采用反演分析获得了基于孔压数据和沉降数据拟合的径向固结系数hc和地基的平均固结度。在第一级加载监测数据反演分析的基础上,预测了地基在下一级堆载下沉降发展规律。同时,根据监测数据得出了孔压系数与路堤堆载速率之间的关系,为控制堆填速率提供参考。对指导软土地区高填方路堤工程的监测具有借鉴意义。
In high-embankment embankment construction in the soft soil area will have a greater deformation of the foundation, the need to closely monitor the deformation during the construction of the ground and pore pressure changes. The construction of high-fill airport runway in a soft soil area in foreign countries is introduced. Through the on-site monitoring, the variation law of foundation settlement and pore water pressure during embankment filling is obtained. Based on the monitoring data obtained by the first stage of surcharge preloading, the radial consolidation coefficient hc and the average consolidation degree of foundation based on the fitting of pore pressure data and settlement data were obtained by inversion analysis. Based on the first-stage loading monitoring data inversion analysis, the settlement subsidence rule of subgrade under the next stage is predicted. At the same time, the relationship between pore pressure coefficient and embankment pile-up rate is obtained based on the monitoring data, which provides a reference for controlling the filling rate. It is of significance to guide the monitoring of high embankment embankment in soft soil area.