在长螺旋钻成孔过程中,孔底残留过多虚土,以致清孔达不到要求,为解决该问题,提出了利用泥浆与虚土相结合随钻出孔的清孔新方法。分析了泥浆护壁原理,在高铁复合路基工程实例中利用成小直径孔的随钻出孔清孔新方法,效果显著,方法实用可行,开创了长螺旋钻成孔的清孔新方法。 In the long auger drilling process, the hole bottom too much residual soil, so that clear hole does not meet the requirements, in order to solve this problem, put forward the use of mud with the virtual soil with drilling holes when the new hole cleaning method. The principle of slurry retaining wall was analyzed. A new method of clearing hole with drilled holes into small diameter holes was used in the engineering example of high speed railway complex subgrade. The method has obvious effect and the method is practicable and opens up a new method of clearing holes with long auger holes.