高能级强夯置换地基沉降理论分析及实测研究

Theoretical Analysis and Monitoring of High Energy Dynamic Compaction Replacement

根据沉降计算分层总和法,对高能级强夯置换处理后的新近深厚填土地基沉降进行理论计算。考虑到地基土层复杂性和理论计算局限性,对工后沉降开展实测研究。通过现场罐周沉降量监测与理论计算对比分析表明,高能级强夯置换复合施工工艺能有效加固性质复杂的新近深厚填土,场地工后沉降量、不均匀沉降和整体倾斜均能达到设计和规范要求。工后沉降监测曲线随着时间增长逐渐减小并趋于稳定。沉降计算和监测结果证明高能级强夯置换施工工艺处理新近深厚填土是适宜的,工后半年内场地地基土固结基本完成,大大降低工程建设周期。

This paper presents a settlement estimation of the soil improvement ground of thick fills by high energy dynamic replacement using the summation of sub-layered settlement analysis method.The actual settlements of the improved ground at the perimeters of the tanks were monitored during and after construction considering the complication of the improved soil layers and limitation of the existing theoretical settlement estimation methods.After comparing the monitored and estimated settlement values,the following conclusions can be obtained:The high energy dynamic compaction replacement method can be used in improving the thick recent random fill site.Both estimated and monitored settlement values indicated that the total,differential settlements and tilting of the structure can meet the code requirements.The rate of settlement after the construction reduces with time and the settlement approaches to stable within six months after the construction.