碎石桩法处理液化地基时桩间距的确定

Spacing of Gravel Pile in Treatment of Liquefiable Ground

碎石桩法处理可液化地基土一般采用振动成桩工艺。地表会因振动密实产生一定的沉降,沉降量的大小与桩间距的设计有关。而桩间距的大小,又直接影响到地基处理的技术经济效果。就修订前后的《建筑地基处理技术规范》中的相关规定,讨论了碎石桩处理可液化地基时桩间距确定的有关问题,提出了考虑地表下沉量的桩间距的计算方法和公式。通过工程实例进行了验证和比较,表明设计计算结果更为合理,方法具有很好的实践应用价值。

The vibrating gravel piles are used to treat liquefiable ground. The vibrating process will cause a certain settlement. The settlement is related to the pile spacing, and further affects the expend of treatment. The problem about pile spacing on ground treatment for liquefaction counteraction using gravel piles, with regard to the active Technical code for ground treatment ofbuildings（JGJ79—2002）and the old one, is discussed. The calculation methods of pile spacing considering the ground surface settlement are recommended and are proved to be proper in practice.