高能级强夯加固软基现场试验研究

In-situ experimental research on high energy dynamic compaction on soft foundation

依托沿海某碎石土回填地基上成功实施的10 000 k N·m高能级强夯实验区,通过深层水平位移监测项目,对高能级强夯施工过程中周边土体环境深层土体位移进行了分析,为高能级强夯的设计、监测提供了依据.通过实验区设置测斜管对水平位移随深度变化的趋势分析、隔振沟隔振效果分析,揭示了一些规律,为该工艺大面积推广应用及高能级强夯加固机理分析提供数据参考.对地基处理效果进行检验,对夯点和桩间土进行了4个荷载试验,利用荷载试验得到的p-s曲线根据切线模量法反算加固后土体的强度参数,最后利用反算的参数建立有限元模型进行分析.

This paper studies the implementation of high energy of 10 000 k N·m dynamic compaction reinforcement of the coastal gravel backfill foundation.The deep soil displacements are analyzed through monitoring the deep soil displacements,in order to improve the high energy dynamic compaction design and lay a foundation for monitoring.Conclusions can provide data reference for the technology popularization and application to large area; and high energy dynamic compaction mechanism analysis is made by analyzing inclinometer variation with depth and vibration isolation effect.The reinforcement effect is examined by 4 loading tests.Based on tangent-modulus method,the strength parameters of soil are back calculated through p-s curves obtained by loading tests.Finally,by using the strength parameters of soil,finite element model is built to analyze the effect of reinforcement.