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(華東建筑設(shè)計研究院有限公司  上海 200002)
［提要］  樁端后注漿灌注樁單樁合理注漿量與承載力的計算成為工程界關(guān)注的主要問題之一，尚無設(shè)計規(guī)程可循。結(jié)合上海地區(qū)樁端后注漿灌注樁的工程實踐，基于已有研究成果和上海軟土地區(qū)工程地質(zhì)條件，提出了物理幾何意義明確的合理注漿量公式，并從樁身與樁端擴徑的角度提出了樁端后注漿鉆孔灌注樁承載力的計算公式。計算方法直觀地體現(xiàn)了注漿量對后注漿樁承載力提高的影響，并與所給出的合理注漿量公式相聯(lián)系，參數(shù)便于確定。在上海若干工程中的應(yīng)用結(jié)果表明方法是合理的。
［關(guān)鍵詞］  后注漿  鉆孔灌注樁  合理注漿量  單樁承載力  計算方法
Estimate of the Reasonable Quantity of Grouting and the Bearing Capacity of Post Basegrouted Bored Pile/Wu Jiangbin, Wang Weidong(East China Architecture Design & Research Institute Co., Ltd., Shanghai 20002,China)
Abstract:The most interested problems of the design of post basegrouted bored pile are the estimate of the quantity of grouting and the bearing capacity. A formula of the estimate of post grouting, with clear geometrical meaning and matching dimension, is brought out. Then based on the formula, the estimation of bearing capacity of post basedgrouted pile is brought out from the point of view of the enlarge of the pile after grouting. The method behaves the affection of quantity of grouting on the bearing capacity of post grouting pile directly. The estimate method of quantity of grouting and bearing capacity is applied in the project of a tall building in Shanghai and gets reasonable result.
Keywords:post grouting; bored pile; reasonable quantity of grouting; bearing capacity; computation formula
*上海市科委重點攻關(guān)項目：深層地下結(jié)構(gòu)開發(fā)關(guān)鍵技術(shù)研究(052112010)。