- 摘 要
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（蘇州九城都市建筑設(shè)計(jì)有限公司， 蘇州 215123）
［摘要］大直徑超長后注漿鉆孔灌注樁單樁合理注漿量和極限承載力的確定成為設(shè)計(jì)所面臨的問題。介紹了后注漿鉆孔灌注樁后注漿的加固機(jī)理和注漿方式。著重介紹了蘇州中心廣場項(xiàng)目不同樁徑、不同持力層的大直徑超長后注漿鉆孔灌注樁的試樁數(shù)據(jù)，并結(jié)合蘇州金雞湖周邊其他4個(gè)超高層項(xiàng)目大直徑超長后注漿鉆孔灌注樁的試驗(yàn)數(shù)據(jù)，分析了大直徑超長后注漿鉆孔灌注樁的承載性能。根據(jù)《建筑樁基技術(shù)規(guī)范》(JGJ 94—2008)和上海市《地基基礎(chǔ)設(shè)計(jì)規(guī)范》(DGJ 08-11—2010)中的相關(guān)公式，估算了單樁注漿量和單樁極限承載力標(biāo)準(zhǔn)值，并將其估算結(jié)果與試驗(yàn)數(shù)據(jù)進(jìn)行對比，給出了蘇州地區(qū)類似地質(zhì)條件下直徑1000mm大直徑超長后注漿鉆孔灌注樁樁端后注漿量的合理范圍為2～4t的建議，提出了大直徑超長后注漿鉆孔灌注樁試樁之前的單樁極限承載力標(biāo)準(zhǔn)值可按《建筑樁基技術(shù)規(guī)范》(JGJ 94—2008)中樁側(cè)阻力和樁端阻力增強(qiáng)系數(shù)的上限值進(jìn)行估算。研究結(jié)果可為蘇州地區(qū)大直徑超長后注漿鉆孔灌注樁的類似工程設(shè)計(jì)提供參考。
［關(guān)鍵詞］大直徑超長鉆孔灌注樁； 后注漿； 極限承載力標(biāo)準(zhǔn)值； 注漿量； 靜載荷試驗(yàn)
中圖分類號：TU473文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)06-0122-06
Experimental study on large-diameter super-long post-grouting bored cast-in-place pile in Suzhou
Zhong Jianmin
(Suzhou Nine Urban Architectural Design Co., Ltd.， Suzhou 215123, China)
Abstract:The determination of reasonable grouting volume and ultimate bearing capacity of single pile for large-diameter super-long post-grouting bored cast-in-place pile has become the problem in design. The reinforcement mechanism and grouting method of post-grouting bored cast-in-place pile were introduced. The test pile data of the large-diameter super-long post-grouting bored cast-in-place piles with different pile diameters and embedded in different bearing layers in Suzhou Central Plaza Project were emphatically introduced. The bearing performance of the large-diameter super-long post-grouting bored cast-in-place pile was analyzed combined with the test data of large-diameter super-long post-grouting bored cast-in-place piles of 4 super high-rise buildings around Jinji Lake in Suzhou. According to the relevant formulas in Technical code for building pile foundation (JGJ 94—2008) and Foundation design code of Shanghai (DGJ 08-11—2010), the single pile grouting volume and single pile standard value of ultimate bearing capacity were estimated, and the estimations were compared with experimental data. This suggestion is provided that the reasonable range of grouting volume of pile end of the large-diameter super-long post-grouting bored cast-in-place pile with a diameter of 1000mm is 2～4t under similar geological conditions in Suzhou, and that the single pile standard value of ultimate bearing capacity of the large-diameter super-long post-grouting bored cast-in-place pile before the pile test can be estimated according to upper limit value of pile side resistance and pile end resistance enhancement coefficients in Technical code for building pile foundation (JGJ 94—2008). The research results can provide reference for similar engineering design of large-diameter super-long post-grouting bored cast-in-place pile in Suzhou.
Keywords:large-diameter super-long bored cast-in-place pile; post grouting; standard value of ultimate bearing capacity; grouting volume; static loading test
作者簡介：鐘建敏，碩士，正高級工程師，一級注冊結(jié)構(gòu)工程師，注冊土木工程師（巖土），Email：82503755@qq.com。
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