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前言近年来,上海地区的高层建筑发展很快,而高层建筑的基础型式也较多。有的采用补偿式箱形基础,有的用桩基,也有用筏基加桩基、箱基加桩基等型式。至于桩的设计与持力层的选择也有多种情况:有以浅埋于地表下的砂层为持力层的短桩(约8米长),有以暗绿色亚粘土硬层为持力层的中长桩(长度约在25米左右),也有以深埋于地表下的砂层为持力层的长桩(长度约在28米以上)。1984年上海还出现了55米长的钢管桩
Foreword In recent years, high-rise buildings in Shanghai have developed rapidly, and high-rise buildings have more basic types. Some use compensated box-type foundations, some use pile foundations, and they also have rammer-based pile foundations, box foundations and pile foundations. As for the design of the pile and the selection of the bearing layer, there are also many cases: There are short piles (about 8 meters long) with the sand layer shallowly buried under the surface as the bearing layer, and there is a layer of dark green subclay as the holding layer. The middle and long piles (about 25 meters in length) also have long piles (length of about 28 meters or more) with a sand layer that is buried deep under the surface of the ground. In 1984 Shanghai also appeared 55 meters long steel pipe piles