论述了泥浆护壁钻孔灌注桩的压浆机理和压浆工艺,包括压浆回路的设计,浆液配制,压浆工艺控制及压浆后的效果分析,通过试验说明了桩底压浆可以明显提高桩基承载力,并减小桩基沉降量。这对于大直径超长泥浆护壁钻孔灌注桩的施工提供了一个新的思路,桩底压浆工艺应进一步在桥梁基础中推广。 The grouting mechanism and grouting process of mud-wall cast-in-place bored piles are discussed, including the design of grouting loop, the preparation of slurry, the control of grouting process and the analysis of the effect after grouting. The test results show that the grouting of pile bottom can be obviously improved Pile foundation bearing capacity, and reduce the pile settlement. This provides a new idea for the construction of large-diameter mud retaining wall bored piles. The grouting of pile bottom should be further popularized in the bridge foundation.