2、当采用基岩作为桩的持力层时，应查明基岩的岩性、构造、岩面变化、风化程度，确定其坚硬程度、完整程度和基本质量等级，判定有无洞穴，临空面、破碎岩体或软弱岩层；
3、查明水文地质条件，评价地下水对桩基设计和施工的影响，判定水质对建筑材料的腐蚀性；
4、查明不良地质作用，可液化土层和特殊性岩土的分布及其对桩基的危害程度，并提出防治建议；
5、评价成桩可能性，论证桩的施工条件及其对环境的影响。
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