高水位軟土地區(qū)樁基礎(chǔ)設(shè)計思路和方法
李培，周筍，王洋，張雨薇
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（北京市建筑設(shè)計研究院有限公司， 北京 100045）
［摘要］在高水位地區(qū)，由于受到水浮力的影響，樁的受力比較復(fù)雜。結(jié)合一高水位軟土地區(qū)的樁基礎(chǔ)設(shè)計實例，歸納總結(jié)出高水位軟土地區(qū)樁基礎(chǔ)設(shè)計的思路和方法：樁是抗拔樁還是抗壓樁應(yīng)該根據(jù)設(shè)計所考慮的各種工況綜合判定，樁數(shù)的確定應(yīng)采用多工況包絡(luò)設(shè)計；在正確判定樁受力類型的基礎(chǔ)上，樁的配筋應(yīng)滿足其實際受力需要，同時還應(yīng)滿足相應(yīng)的構(gòu)造要求。目前，正在被廣泛應(yīng)用的PHC管樁，雖然廉價且施工速度快，但其抵抗水平力的能力很差，在高水位軟土地震多發(fā)地區(qū)應(yīng)慎重選用。在高水位軟土地區(qū)選用后壓漿鉆孔灌注樁并采用樁側(cè)、樁底同時注漿的施工工藝，對大幅提高單樁豎向極限承載力有很好的效果。［關(guān)鍵詞］高水位; 軟土; 樁基礎(chǔ)設(shè)計; PHC管樁; 后壓漿鉆孔灌注樁中圖分類號：TU473 文獻標識碼：A 文章編號：1002-848X(2015)18-0094-07
Ideas and methods of pile foundation design in the area with high water level and soft soilLi Pei, Zhou Sun, Wang Yang, Zhang Yuwei(Beijing Institute of Architectural Design, Beijing 100045, China)Abstract: In the area with high water level, due to the influence of water buoyancy on building, pile force is complicated. With a pile foundation design example in the area with high water level and soft soil, the ideas and methods of pile foundation design in the area with high water level and soft soil were summarized. The pile should be judged as a uplift pile or compression pile according to the various working conditions in design. The determination of the pile quantity should adopt envelope design. Based on correct determination of pile mechanical type, pile reinforcement should meet the actual mechanical needs as well as the requirements of corresponding construction details. At present, prestress high concrete (PHC) piles are being widely used, because of the low cost and easy construction, but the ability to resist the horizontal force is very poor, so the earthquake prone area with high water level and soft soil should be chosen carefully. In addition, the post grouting for cast-in-situ pile grouted on the side and bottom of the pile at the same time could substantially increase the vertical ultimate bearing capacity of single pile in the area with high water level and soft soil.Keywords: high water level; soft soil; pile foundation design; PHC pile; post grouting for cast-in-situ pile
作者簡介：李培，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師，Email: 1040773008@qq.com。
