高层建筑钻孔桩基长期沉降特性分析

结合上海地区26栋高层建筑钻孔桩基长期沉降观测资料,分析桩端持力层的种类、桩端压缩层中砂土比、桩周土层特性等因素对钻孔桩基长期沉降特性的影响,结果表明,桩基持力层的选择和压缩层内的砂土比对桩基沉降有较大影响,钻孔桩沉降受桩周土的影响明显小于打入桩基础。

ANALYSIS ON CHARACTERISTICS OF LONG-TERM SETTLEMENT OF BORED PILE FOUNDATION OF HIGH-RISE BUILDING

Based on long-term settlement monitoring data of bored pile foundations in 26 high-rise buildings in Shanghai,analysis is made on the effects of the types of pile toe bearing strata,sand layer depth ratios in compressible layers under pile tip and soil properties surrounding the pile shaft on the long-term settlement characteristics of bored pile foundations.And the result shows that the pile toe bearing strata and the sand layer depth ratio are the major factors affecting the foundation settlement while the settlement of the bored piles is apparently less affected by surrounding soil than that of driven pile foundation is.