摘要
采用基于有效应力原理的β法结合具体工程的试桩结果进行分析,揭示了基坑开挖导致坑底试桩极限承载力降低的内在原因,认为开挖段侧摩阻力的影响只是二者承载力差异的次要因素,更主要原因是桩顶截断标高所在平面以上未开挖土层在桩周土中产生的附加应力的影响。这种影响不仅体现在基坑开挖深度对承载力差异的影响上,也体现在基坑开挖宽度及桩基在基坑中的位置对承载力差异的影响上。
β-Method based on the effective stress theory is used to investigate the deep reason of the pile capacity reduction due to the excavation.The skin friction of embedded length above cut-off level has only minor contribution to the big difference between the pile load tests before and after excavation,the major reason is the influence of the additional stress around pile-soil interface caused by the self-weight of unexcavated overburden soil above the pile cut-off level.Such influence is not only affected by excavation depth and width,but also by pile location in excavation pit.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第S2期259-262,共4页
Chinese Journal of Geotechnical Engineering
关键词
地面试桩
坑底试桩
有效应力原理
β法
pile tested on ground
pile tested after excavation
effective stress theory
β-method
