填海工程深厚碎石回填地基强夯试验研究

Experimental study on dynamic compaction of deep gravelly filling soil for land accretion engineering

针对填海工程大厚度碎石回填地基,开展了3000k N·m、6000k N·m和10000k N·m的高能级强夯现场试验,通过夯前、夯后现场超重动力触探试验、瑞雷波检测和夯后平板载荷试验结果的对比分析,确定出不同夯击能下强夯的影响深度和地基加固效果。综合分析认为,3000k N·m夯击能影响深度约为6m,承载力特征值为180k Pa;6000k N·m夯击能影响深度为6~9m,承载力特征值为200k Pa;10000k N·m夯击能影响深度为9~12m,承载力特征值为200k Pa。试验结果可为同类地区高能级强夯工程提供参考。

For the land accretion with deep gravelly filling soil,the 3000 k N·m,6000 k N·m and 10000 k N·m high energy level dynamic field tests are carried out to determine the different effect of dynamic compaction reinforcement through the comparative analysis of heavy dynamic penetration,Rayleigh wave detection and plate loading test results. For the 3000 k N·m tamping energy,the influence depth is about 6m and the load bearing capacity is 180 k Pa. For the 6000 k N·m tamping energy,the influence depth is 6 ~ 9m and the load bearing capacity is 200 k Pa. For the 10000 k N·m tamping energy,the influence depth is 9 ~ 12 m and the load bearing capacity is 200 k Pa. The test results could provide reference for the high energy level dynamic compaction in the similar areas.