在有限的扩底桩计算公式中，普遍存在着对爆扩桩的承载机理不清楚，对扩大头作用的体现机理表达不准确等问题。

In the limited formula of explosive-enlarged hole pile, there are some unclear expressions of the mechanism in bearing load.

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讨论了影响扩底桩的扩大头发挥作用与持力层相关的因素，包括持力层土的性质、扩大头进入持力层的深度、持力层的厚度。

These influences include character of the bearing stratum, depth of belled end in the bearing stratum, thickness of the bearing stratum.

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在压桩过程中同时在桩侧注入浆液，桩尖达到设计深度后，浆液随着桩的沉入在桩端形成注浆扩大头。

In the time of pressing the pile, the grout are inject into the soil. When the pile tip reaches the design depth, then continue to inject grout into the pile, so that the pile head expand.

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