强夯法处理吹填砂地基的试验研究

Experimental Study on Dynamic Compaction in Treatment of Hydraulic Fill Sand Subgrade

强夯法是处理吹填砂地基的一种有效方法。试验表明:吹填砂地基经过强夯后超静孔隙水压力消散速度较快;第一遍强夯会对后继强夯的孔压上升及消散周期产生不利影响,所以第二次夯击超静孔隙水压力比第一次高,且消散速度慢;不同夯击能量会导致各区孔隙水压力变化规律不一;地基土平均比贯入阻力及地基承载力均有大幅度提高。

Dynamic compaction method is an effective method to deal with hydraulic fill sand subgrade.It is shown from experiment that excess pore water pressure of hydraulic fill sand subgrade after dynamic compaction dissipates rapidly.The primary dynamic compaction will bring adverse effect on increase and dissipation cycle of pore water pressure at subsequent compaction,so the excess pore water pressure through secondary compaction is higher and dissipates faster than that through the primacy compaction.Different compaction energy will cause variable rule of pore water pressure.Foundation soil average penetration resistance and foundation bearing capacity will be largely increased.