爆夯动力固结法加固软基试验研究

Experimental research on soft foundation treatment by blasting ramming dynamic consolidation

爆夯动力固结法是一种爆炸作用和上覆荷载相结合的新型地基处理方法。其作用原理是利用条形炸药在设置有排水通道的软土地基中爆炸产生高能量瞬变荷载使土体结构发生变化,软土中超静孔隙水压力急剧上升、消散,并在上覆荷载的作用下使土体快速排水固结。在广东佛山合顺-北滘公路干线拟建路段进行的现场试验和室内试验均表明了其加固软土地基的有效性,并结合沉降数据推算了爆夯设计参数,确定本次试验爆夯效果相当于3.2m高的堆载。

Blasting ramming dynamic consolidation is a new foundation treatment method which combines explosion effect of strip dynamite with surcharge to change the structure of soft soil installed with drainage in advance. In this process, the excess pore water pressure surges, dissipates and the consolidation of the soil is accelerated under the surcharge. Experiments are carried out in Heshun-Beijiao highway to prove the effect of this method. Based on settlement data, design parameters are calculated; and results show that the explosion effect of the experiment is equal to 3.2 m surcharge. The vibration problem caused by explosive ramming＇is also analyzed.