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盧 奕，姚 華，李文春，王 華，黃厚平，吳永紅
(天津市勘察院，天津300191)[摘要] 對天津濱海地區(qū)76m鉆孔灌注樁承載機理進行了研究，分析了其荷載傳遞機理及樁側(cè)摩阻力和樁端阻力在總承載力中的發(fā)揮比重。研究結(jié)果表明：天津濱海地區(qū)超長鉆孔灌注樁基本屬于摩擦型樁，樁端阻力發(fā)揮比重很小；按照規(guī)范估算的樁側(cè)摩阻力較小而樁端阻力較大，與實際兩者發(fā)揮程度不符；合理的估算樁側(cè)摩阻力及樁端阻力，不僅有利于基礎(chǔ)的優(yōu)化設(shè)計而且還將帶來一定的經(jīng)濟效益。
[關(guān)鍵詞] 荷載傳遞；樁身軸力分布；樁側(cè)摩阻力；樁端阻力Research on the bearing capacity of the extra long cast-in-place pile in Tianjin Binhai New Area
Lu Yi, Yao Hua, LiWenchun, Wang Hua, Huang Houping, Wu Yonghong
(Tianjin lnstitute ofGeotechnicalInvestigation&Survrying, Tianjin 300191, China)Abstract: It makes a research on bearing mechanism of the extra long cast-in-place pile in tianjin coastal and analyzes load transfer mechanism and proportion relationship of pile side friction resistance and tip resistance. The results show that the extra long cast-in-place pile in tianjin coastal belong to friction piles, and the proportion of tip resistance in the total bearing capacity is correspondingly small. According to criterion, estimation of pile side friction resistance is smaller than the actual value, but the estimation oftip resistance is larger than the actual value. So reasonable estimation of them is not only beneficial to optimization design for foundation, but also brings some economic benefit.
Key words: mechanism of load transferring; distribution of axial force of piles; side friction resistance of pile; bottom resistance of pile
