对于钻孔灌注桩，由于成桩过程中钻孔机具会对桩端土体产生搅动、切削、挤压等作用，对持力层产生扰动，因而也会使端阻力降低；在持力层为砾石层中钻孔灌注桩正循环清孔一般只是将细颗粒淸上来，而粗大颗粒仍留在桩端造成空隙增大，泥浆沉淀到空隙中造成端阻力降低。凡是湿法施工的钻孔灌注桩一般均要采用泥浆护壁，就必然会带来桩端沉渣问题。
钻孔灌注桩的沉渣问题可导致桩的承载力降低，桩沉降过大。图(b)为典型的桩端沉渣过厚的破坏曲线，由于沉渣过厚，使得桩侧阻力发挥完全而桩端未承担荷载, 导致桩自动下沉120mm,并且压力下跌。在沉渣被压实后，随着端阻力的部分恢复，承载力又逐渐增加。
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