泥浆护壁钻孔灌注桩施工属于隐蔽工程，成桩质量的好坏直接影响上层结构的安全和建筑物的沉降。
The construction of drilled hole with shaft wall protection by drilling mud belongs to the concealed work, the pile quality influences directly the superstructure security and the building subsidence.
泥浆护壁钻孔灌注桩的嵌岩深度的控制值问题目前尚未明确。
The proper control value of embedded depth in rock of slurry drilled pile, so far has not been determined.
泥浆护壁钻孔灌注桩当桩端持力层为砂土层等非岩石层时，通过桩底压密灌浆能有效地提高单桩承载力。
When the bearing stratum at the tip of bored pile is sandy soil stratum, the method of pile tip pressure grouting can effectively improve the bearing capacity of single piles.
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