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水泥粉煤灰碎石桩(即cement frying-ashgravel pile)简称为CFG桩。是用碎石、石屑、粉煤灰和少量水泥,加水拌和,用振动沉管打桩机或长螺旋钻管内泵压成桩机制成的具有一定黏结强度的桩,桩和桩间上通过褥垫层调解,联合作用形成复合地基。造价较低,施工方便。文章以闻合高速公路K31+300钢筋混凝土拱涵基底处理为例,针对湿陷性黄土地基处理施工工艺,对采用水泥粉煤灰桩复合地基施工进行了综合分析,并对施工可行性进行了探讨。
Cement fly ash gravel pile (ie, cement frying-ashgravel pile) referred to as CFG pile. Is the use of gravel, stone chips, fly ash and a small amount of cement, add water mixing, with vibratory tube pile driver or long auger pipe pump into the piling machine has a certain bond strength of the pile, pile and pile through the mattress Cushion mediation, the combined effect of the formation of composite foundations. Lower cost, easy construction. Taking Wenchong K31 +300 reinforced concrete arch culvert foundation treatment as an example, aiming at the construction technology of collapsible loess foundation treatment, the construction of composite foundation with cement fly ash pile is comprehensively analyzed and the feasibility of construction is analyzed. Discussion.