上海地区建筑工程普遍采用桩基，但以粘性土为持力层的预制桩实测承载力普遍低于理论值，主要是因为休止期较短及对端承力作用认识不足。
Pile foundation is widely used in construction in Shanghai region, but the site test data on bearing capacity of pre-cast concrete pile based on cohesive soil were lower than theoretical level.
软岩地基上的嵌岩桩基础一般都认为是端承桩，设计时假定上部结构荷载全部由桩来承受，而不考虑桩间土的承载力。
Piles socketed in soft rock were traditionally regarded as end bearing piles, and the loads transferred from superstructure were assumed in design to be shouldered totally by the piles.
浆体与软弱地基土结合形成复合地基，可提高桩端承载力。
Cement paste with the weak foundation soil combine to form a composite foundation, can improve pile bearing capacity.
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