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張 偉，嚴力軍，劉 俊
（香港華藝設計顧問（深圳）有限公司，深圳518031)[摘要] 基于實際工程背景，對處于復雜溶巖地質(zhì)條件下超長地下室基礎設計問題進行探討，針對不同地質(zhì)情況給予不同的樁型選擇。為查明溶洞和土洞分布，要求對塔樓以外地下車庫部分進行一柱一樁的超前鉆勘查，塔樓內(nèi)為一樁3~4孔，以便給基礎設計提供可靠依據(jù)。及時吸取一期工程的施工經(jīng)驗，對溶洞處理效果和方法予以總結，為后續(xù)工程提供改進措施。綜合考慮造價、施工便利和安全可靠等各項因素，分別對樁身縱筋長度取值、承臺和底板設計、超長地下室抗裂的構造措施和樁基檢測等各方面問題予以闡述，供同類工程參考。
[關鍵詞] 溶巖；預應力管樁；鉆孔灌注樁；豎向承載力特征值Discussion on Foundation Design of Super Length Basement Under Complicated Karst Geological Conditions
Zhang Wei, Yan Lijun, Liu Jun,
( Hong Kong Huayi Design & Consultant Co. Ltd. , Shenzhen 518031, China)Abstract: Based on engineering, foundation design of super length basement under complicated karst geological conditions is discussed, The choice of pile type is used differ from geological condition. In order to find out distributing about karst and soil cave,it is urge to drill for each column position in the basement outside the tower in advance, 3~4 hole is demanded for each pile inside the tower, which is the reliable basis for foundation design. Accepted construction experience from the first period, the effect and method on how to deal with karst, are summarized and improved the measures in the next period. Cost, construction convemence and safety are considered, the length of steel bar for pile, the design of pile cap and foundation slab, construction measures for prevented crack of super length basement and testing of pile foundation are expounded for reference.
Keywords: karst; PHC pile; ored hole cast-in-situ pile; characteristic value of the vertical bearing capacity
