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结合工程实际，对在粉煤灰层中钻孔容易出现塌孔和沉渣超限问题进行了试验研究，分析了塌孔类型及其机理、沉渣形式及其规律，提出了加固孔壁、增强成孔稳定性的工程措施和成孔稳定性预控参数及控制范围，对在粉煤灰层中灌注桩钻进成孔具有指导意义和参考价值。
According to the engineering practice, the hole collapse and slag overrun in borehole in fly ash layer are easy to occur. The types of collapsible hole and its mechanism, the sediment form and its regularity are analyzed. The engineering measures of pore stability and pre-control parameters and the control range of pore-forming stability are of guiding significance and reference value for drilling grouting piles in fly ash layer.