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(嘉興學院建筑工程學院 314001) 高 飛(上海巖土工程勘察設(shè)計研究院 200002)
【提要】 樁端后注漿是軟土地區(qū)大直徑超長鉆孔灌注樁發(fā)展的必然趨勢。依據(jù)軟土地區(qū)某超高層建筑大直徑超長鉆孔灌注樁試樁的豎向抗壓靜載試驗結(jié)果，通過對基樁的豎向極限承載力性狀、樁身軸力傳遞特性以及樁側(cè)阻力、樁端阻力發(fā)揮特性的分析研究，揭示了樁端后注漿對基樁承載性狀的影響情況，深入探討了軟土地區(qū)大直徑超長后注漿灌注樁的荷載傳遞機理和豎向承載性狀，并提出了單樁承載力的估算方法。
【關(guān)鍵詞】軟土 大直徑超長灌注樁 樁端注漿 高噸位靜載試驗 荷載傳遞
Test Research   on Vertical Bearing Capacity of Superlong Largediameter Basegrouting Bored Piles in Soft Soil/Shen Xiaomei1,Gao Fei2(1 Architecture Engineering College, Jiaxing University,Jiaxing 314001,China;2 Shanghai Geotechnical Investigation & Design Institute,Shanghai 200002,China)
Abstract:Basegrouting is an inevitable development trend of overlength largediameter bored piles in soft clay area.Based on the results of vertical static loading test of the two single piles with basegrouting in the super highrise building,the influence of basegrouting on the bearing property of the pile is revealed by analyzing its properties of vertical limit bearing capacity,axial load transmission and tip and shaft resistance of pile.The load  t-ransfer performance and bearing mechanism are discussed in detail.A method is suggested to estimate the ultimate bearing capacity of a single pile.
Keywords:soft soil;super long and large diameter bored pile;base grouting;vertical static loading test