人工挖孔扩底桩竖向承载力计算及应用分析-calculation and application analysis of vertical bearing capacity of manual digging belled pile.docxVIP

工程硕士学位论文摘 要 工程硕士学位论文 摘 要 I 摘 要 尽管人工挖孔扩底桩在国内外已得到较广泛的应用，但对于相同的人工挖孔扩底桩采 用不同国家、不同行业的建议公式进行计算，其结果相差可能一倍以上。本文首先在总结 各国挖孔扩底桩应用情况的基础上，就扩底桩的构造进行了详细的归纳。总结了扩底桩承 载力计算公式，详细叙述了人工挖孔扩底桩的受力机理和变形特征，结合已有的试桩资料， 从强度和变形两方面，对确定单桩竖向承载力的方法进行了论述，其中特别论述了扩底桩 地基变形模量的确定方法，并从 Mindlin 解出发，利用数学方法得出了影响地基土变形模 量大小的因素—泊松比 μ，初步确定了比较完善的变形模量计算公式。在此基础上，论文 详细归纳了以相对沉降为依据确定单位面积端承力 qb 的计算方法，并考虑扩底桩的“拱 效应”特点，引入了有效桩长的概念。最后结合我校新校区建设，对人工挖孔扩底灌注桩 在我校新校区的建设中应用情况进行了观测和评价。 关键词：人工挖孔扩底桩；轴向承载力；沉降；Mindlin 解；变形模量 I 工程硕士学位论文AbstractIII 工程硕士学位论文 Abstract III Abstract Structure that Despite the artificial dig the the bore extend the bottom the stake the suggestion formula for artificial for at domestic and internationally already getting the extensive the application, but for same alike digging the the bore extend the bottom the the the stake the the different the nation, different profession the of the adoption the the to proceed the calculation, its consequently the differ the possibility a the times the the are above. This text first on the summary all countries dig the the bore extend the bottom stake the foundation for applying the the circumstance, extend the bottom the stake proceeds detailed the induce.Tally the upping the extend the bottom the the the stake the the loading the the the dint to the compute the the the formula, detailed description artificialed to dig the the bore extend the bottom the the suffering of the stake the the dint machine the theories the with transform the characteristic, and join together to already have of try a data, from the strength with transform the both side, method towards certain single stake the the straighten the direction the the the loading the the the dint the the the to the the the proceeds the the the the the the the treatise, and among them and specially discuss the the extend the bottom the stake the the the foundation the to the transform the the the mold the to the measure the to the really the settle the the the method, and from the Mindlin solve to set out, make use of th