降水联合强夯加固吹填粉土地基现场试验研究

Experimental research on dredger-filled powder soil foundation treatment with well-point dewatering combined with dynamic compaction method

结合潍坊港某吹填土地基处理工程,分析了降水联合强夯过程中孔隙水压力及沉降变化特点,并结合加固前后标准贯入试验和平板载荷试验对降水强夯加固效果进行了对比分析。试验结果表明:每遍点夯均能产生较大的沉降,且最大累计沉降量与夯击能大小成正比;每遍点夯后超孔隙水压力消散较快,且超静孔隙水压力均在1～2 d内消散90%以上。通过现场检测表明:加固后地面下7. 0 m深度范围的标密实度显著增大,地基承载力得到了较大的提高,加固效果良好。

Combined with the saturated dredger soil treatment engineering in Weifang port,the foundation settlement and pore water pressure were monitored and analyzed in the process of well-point dewatering combined dynamic compaction. In addition,the treatment effect was verified by comparing before and after the reinforcement of standard penetration tests and load-plate tests. Results show that: greater settlement can be produced at each time of dynamic consolidation, and the settlement is proportional to the impact energy; the excess pore water pressure dissipates rapidly after each time of dynamic consolidation,and the excess pore water pressure dissipates more than 90% in 1-2 d. The field test shows that the compactness of the 7.0 m depth range is greatly increased,the bearing capacity of the foundation has been greatly improved,and good results of reinforcement have been achieved.