大直徑超長摩擦灌注樁在深圳地區(qū)應(yīng)用研究
張偉，王興法，劉俊，嚴(yán)力軍，趙洋
- 摘 要
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(香港華藝設(shè)計(jì)顧問(深圳)有限公司， 深圳 518031)［摘要］基于深圳后海片區(qū)場地地質(zhì)情況存在樁基持力層埋深較深、強(qiáng)風(fēng)化層樁周土的摩擦力特征值較高的特點(diǎn)，對比分析超高層建筑采用大直徑超長摩擦灌注樁的可行性。計(jì)算分析表明：較小直徑基樁承載力由樁身強(qiáng)度控制，較大直徑基樁承載力由樁巖土層承載力特征值控制?？紤]不同區(qū)域場地土層分布的差異性，1，2號塔樓、裙房部分樁端持力層分別選擇強(qiáng)風(fēng)化層下段、中風(fēng)化層和強(qiáng)風(fēng)化層上段，各區(qū)域持力層有所區(qū)分，做到經(jīng)濟(jì)合理。對塔樓和部分裙房基樁采用樁端后注漿技術(shù)，能起到加固樁底沉渣、彌補(bǔ)泥漿護(hù)壁施工工藝不足造成的樁端阻力損失等問題。結(jié)合現(xiàn)有檢測手段和試驗(yàn)?zāi)芰Γ岢隼迷囼?yàn)樁進(jìn)行靜載荷試驗(yàn)，并通過在樁身內(nèi)預(yù)埋鋼管，解決超長樁樁底鉆芯取樣困難的問題。針對此類型地質(zhì)情況的樁基設(shè)計(jì)和施工經(jīng)驗(yàn)可為深圳后海片區(qū)同類型工程提供參考。［關(guān)鍵詞］大直徑超長摩擦灌注樁; 靜載試驗(yàn); 樁身強(qiáng)度; 單樁承載力特征值中圖分類號：TU473.1+4 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號：1002-848X(2013)23-0092-08Application and research of large-diameter and super-long friction bored piles in ShenzhenZhang Wei, Wang Xingfa, Liu Jun, Yan Lijun, Zhao Yang(Hong Kong Hua Yi Designing Consultants(S.Z.) Ltd., Shenzhen 518031, China)Abstract: Based on the characteristics of super-deep bearing layer and high characteristic value of skin friction in highly weathered rock under geological conditions in Houhai areas of Shenzhen, the rationality of application of large-diameter and super-long friction bored piles was analyzed by comparison analysis of super-tall buildings. The computational results show that the bearing capacities of small-diameter and large-diameter piles are controlled respectively by pile strength and skin friction. Considering the difference of soil layer distribution in different areas, the bearing layers for pile-end are chosen as respectively lower segment, middle-weathered layer and superior segment of highly weathered layer for 1,2 towers and podium to save cost. The technique of post-grouting at the pile-end was adopted in towers and part of podium, which can reinforce sediment at pile-end and compensate for stress loss of pile-end due to insufficient construction technology at shaft wall protection by drilling mud. Combining the existing examination method and test capacity, it is proposed to carry out static loading test for test piles and embed steel pipes in piles, which can solve the problem of core-pulling for sampling of super-long piles. The experience of design and construction is provided for reference for this type of geological conditions in Houhai areas of Shenzhen.Keywords: Large-diameter and super-long friction bored pile; static loading test; pile strength; characteristic value of the vertical bearing capacity of a single pile作者簡介：張偉，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師，香港工程師學(xué)會(huì)正會(huì)員，Email：zw_huayi@126.com。參考文獻(xiàn)［1］中國海洋石油深圳新大廈巖土工程勘察報(bào)告［R］.深圳市勘察測繪院有限公司，2010.［2］SJG 01—2010 地基基礎(chǔ)勘察設(shè)計(jì)規(guī)范［S］.北京：中國建筑工業(yè)出版社,2010.［3］GB 50046—2008 工業(yè)建筑防腐蝕規(guī)范［S］.北京：中國計(jì)劃出版社,2008.［4］JGJ 94—2008建筑樁基設(shè)計(jì)技術(shù)規(guī)程［S］.北京：中國建筑工業(yè)出版社,2008.［5］DBJ 15-31—2003 建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范［S］.北京：中國建筑工業(yè)出版社,2003.［6］張偉,劉俊,趙洋.不同地質(zhì)條件下基樁樁徑選擇差異性討論［J］.建筑結(jié)構(gòu)·技術(shù)通訊,2013,43(1):22-24.［7］周建龍，包聯(lián)進(jìn)，童駿，等. 天津高銀117大廈基礎(chǔ)設(shè)計(jì)研究［J］.建筑結(jié)構(gòu), 2012,42(5):19-23.［8］JGJ 106—2003建筑基樁檢測技術(shù)規(guī)范［S］.北京：中國建筑工業(yè)出版社,2003.［9］DBJ 15-60—2008建筑地基基礎(chǔ)檢測規(guī)范［S］.北京：中國建筑工業(yè)出版社,2008.［10］SJG 09—2007建筑基樁檢測規(guī)程［S］.北京：中國建筑工業(yè)出版社,2007.
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