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（北京市建筑設(shè)計研究院有限公司， 北京 100045）
［摘要］國瑞·西安國際金融中心主塔樓地上75層，地下4層，建筑總高度349-7m，為目前西北地區(qū)在建第一高樓。綜合周邊工程設(shè)計資料和勘察報告，塔樓采用混凝土灌注樁基礎(chǔ)方案，樁基采用樁徑1-0m、有效樁長約70m的超長樁。鑒于目前該地區(qū)超長灌注樁施工經(jīng)驗(yàn)尚不充分，為了更準(zhǔn)確地了解樁基承載性狀進(jìn)行了專門的試驗(yàn)樁工程。在調(diào)研分析周邊高層建筑樁基設(shè)計方案的基礎(chǔ)上，選取樁徑為1-0m、施工樁長達(dá)76m的樁進(jìn)行試驗(yàn)樁工程，采用反循環(huán)成孔施工工藝及樁側(cè)樁端后注漿工藝。檢測成果表明，成孔質(zhì)量、樁身完整性均滿足規(guī)范和設(shè)計要求，76m長的試驗(yàn)樁單樁豎向極限承載力均可取30 000kN，根據(jù)勘察報告提供的樁側(cè)摩阻力和采用滑動測微應(yīng)力測算得到樁側(cè)摩阻力計算，有效樁長為70m的單樁豎向抗壓極限承載力可取為28 000kN。完備的試驗(yàn)樁設(shè)計、施工及檢測工程為后續(xù)的工程樁設(shè)計提供了可靠的依據(jù)。
［關(guān)鍵詞］國瑞·西安國際金融中心； 超高層； 超長灌注樁； 試驗(yàn)樁； 載荷試驗(yàn)
中圖分類號：TU473-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2016)17-0099-06
Static loading test design and data analysis on super-long bored pile of Glory\5Xi′ an International Financial Center
Fang Yunfei, Wang Yuan, Sun Hongwei
(Beijing Institute of Architectural Design, Beijing 100045, China)
Abstract:The main tower of Glory\5Xi′an International Financial Center has overground 75 floors and 4 floors underground, and the total height of the building is 349-7m. It′s the highest building under construction currently in the northwest region of China. Considering surrounding engineering design data and survey report, the tower adopts the concrete bored pile foundation scheme with super-long piles of pile diameter of 1-0m and effective pile length of about 70m. In view of the fact that the construction experience of super-long bored pile in this area is not enough, the special test pile project was carried out in order to understand the bearing capacity of the pile foundation more accurately. Based on the research analysis on the surrounding high-rise building pile foundation design scheme, piles with pile diameter of 1-0m and construction pile length up to 76m were chosen to test. The pile adopted reverse circulation pile hole-drilling construction process and pile side & end post grouting technology. Test results show that hole-drilling quality and completeness of pile body shall meet the specification and design requirements, and vertical ultimate bearing capacity of 76m long test single pile is 30 000kN. According to the pile side friction resistance calculated by the micro stress at pile sliding side and pile side friction resistance provided by survey report, single pile vertical compression ultimate bearing capacity is recommended as 28 000kN for pile with effective pile length of 70m. The complete test pile design, construction and detection engineering provide a reliable basis for the design of the following engineering piles.
Keywords:Glory\5Xi′ an nternational Financial Center; super-tall building; super-long bored pile; test pile; loading test
作者簡介：方云飛，碩士，高級工程師，注冊土木工程師（巖土），Email:fangyunfei@126.com。
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