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(1 蘭州大學(xué)土木工程與力學(xué)學(xué)院， 蘭州 730000； 2 中鐵西北科學(xué)研究院有限公司， 蘭州 730000；3 石窟寺文物保護(hù)工程技術(shù)集成與應(yīng)用研究國家文物局重點(diǎn)科研基地， 蘭州 730000；4 甘肅省巖土文物保護(hù)工程技術(shù)研究中心， 蘭州 730000)
［摘要］濕陷性黃土地區(qū)地基病害常有發(fā)生，嚴(yán)重危及建筑物和構(gòu)筑物安全。主要以濕陷性黃土地區(qū)某辦公樓擴(kuò)建建筑地基基礎(chǔ)加固工程為實(shí)例，結(jié)合工程地質(zhì)條件、病害原因、地基基礎(chǔ)加固措施和監(jiān)測數(shù)據(jù)，研究了錨桿靜壓樁在濕陷性黃土地區(qū)的地基加固效果；結(jié)合工程實(shí)踐，闡述了錨桿靜壓樁在濕陷性黃土地區(qū)地基基礎(chǔ)加固過程中的關(guān)鍵控制因素。研究結(jié)果表明：錨桿靜壓樁地基加固屬于“干作業(yè)”加固，對濕陷性黃土地區(qū)地基加固較為適用，可有效降低對地基的擾動，增強(qiáng)地基加固效果；垂直度和接樁質(zhì)量是保證壓樁正常進(jìn)行的控制因素，在施工過程中應(yīng)該嚴(yán)格對其進(jìn)行控制；壓樁力和樁入土深度是保證地基加固效果的關(guān)鍵因素，在方案設(shè)計(jì)時就應(yīng)該對其重點(diǎn)考慮。
［關(guān)鍵詞］錨桿靜壓樁； 濕陷性黃土； 地基加固； 垂直度； 壓樁力； 入土深度
中圖分類號：TU472文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)06-0128-06
Study on application of anchor jacked pile foundation reinforcement in collapsible loess area
Wang Fengrui1,2,3,4， Niu Wenqing2,3,4， Zhang Xiaobing2,3,4， Sun Qi2,3,4， Hu Mingzhu2,3,4
(1 School of Civil Engineering and Mechanics of Lanzhou University, Lanzhou 730000, China; 2 Northwest Research Institute Co., Ltd. of China Railway Engineering Corporation, Lanzhou 730000, China; 3 Key Scientific Research Base of Research of Technology in Integrations and Application of the Grottos Conservation, State Administration for Cultural Heritage, Lanzhou 730000，China; 4 Gansu Engineering Technical Research Centre in Geotechnical Cultural Relics Protection, Lanzhou 730000，China)
Abstract:Foundation damages often occur in collapsible loess area, which seriously endanger the safety of buildings and structures. Taking foundation reinforcement project of expansion building for an office building in collapsible loess area as an example, combined with engineering geological conditions, damage causes, foundation reinforcement measures and monitoring data, the foundation reinforcement effect of anchor jacked pile in collapsible loess area was studied. And the key controlling factors of anchor jacked pile in foundation reinforcement process in collapsible loess area were expounded combined with engineering practice. The research results show that anchor jacked pile reinforcement belongs to “dry operation” reinforcement and is more suitable for foundation reinforcement in collapsible loess area, which can effectively reduce the disturbance to the foundation and enhance the effect of foundation reinforcement; verticality and quality of pile connection are the controlling factors to ensure the normal operation of pile-pressing, which should be strictly controlled in the construction process; piling force and piling depth into soil are the key factors to ensure the effect of foundation reinforcement, which should be taken into account in the design of the scheme.
Keywords:anchor jacked pile; collapsible loess; foundation reinforcement; verticality; piling force; piling depth
*中鐵科研院項(xiàng)目“既有建筑改造與病害處理工程動態(tài)安全保障關(guān)鍵技術(shù)研究”資助（2016-KJ005-Z005-03），中鐵科研院科技開發(fā)計(jì)劃項(xiàng)目“病害巖土體快速修復(fù)補(bǔ)強(qiáng)材料及成套裝備技術(shù)研究”項(xiàng)目資助(2018-KJ012-Z012-XB)。
通訊作者：牛文慶，碩士，工程師，Email:niuwqing_1@163.com。
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