- 摘 要
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(1 福建省新五環(huán)工程設計院有限公司廈門分公司, 廈門 361009; 2 黎明職業(yè)大學, 泉州 362000)
[摘要]基于規(guī)范法和“樁土形成水泥土加固體共同作用的等代墩基”原理、群樁效應、負摩阻力作用、樁基承載力計算相關理論公式的對比分析,通過具體的工程實例探討了水泥攪拌樁與旋噴樁復合地基的拓展計算方法及液化層場地的處理措施。分析結果表明,進行非大面積場地處理時,復合基礎承載力計算結果不能全部滿足設計要求,結構存在安全隱患,故拓展驗算是必要的。對于場地存在液化層的復合地基設計,應根據建筑物設防類別和地基液化等級采取相應的加強措施:一般情況下可進行大面積場地處理,以消除液化層,當采用非大面積場地處理時,不僅應滿足承載力驗算要求,還應滿足抗震構造要求。
[關鍵詞]復合地基; 水泥攪拌樁; 旋噴樁; 單樁豎向承載力; 等代墩基; 拓展驗算
中圖分類號:TU472.3+6 文獻標識碼:A 文章編號:1002-848X(2014)08-0025-06
Discussions on composite foundation design with cement mixing piles and jet grouting piles
Yang Wenwu1,2
(1 Xiamen Branch of Fujian Xinwuhuan Construction Design Co., Ltd., Xiamen 361009, China; 2 Liming Vocational University, Quanzhou 362000, China)
Abstract: Based on specific engineering examples, extension calculation methods of composite foundation with cement mixing piles and jet grouting piles were discussed as well as treatment measures of the area with liquefied layers, considering code methods, principle of “formation of cement-soil solid combination equivalent pier foundation from pile and soil”, the pile group effect, the effect of negative skin friction resistance and contrastive analysis of the theoretical formula for the calculation of the pile foundation ultimate bearing capacity. The analysis results show that in small-area ground treatment, composite foundation bearing capacity calculation results can not meet the design requirements, which make it necessary to carry extensive calculation to ensure safety. For composite foundation designs in ground with liquefaction layers, strengthening measures are necessary according to seismic classification and foundation liquefaction level. In general, large-area ground treatment should be carried out to eliminate the liquefaction layers, and in small-area ground treatment, bearing capacity of the structure as well as the details of seismic design should meet the requirements.
Keywords: composite foundation; cement mixing pile; jet grouting pile; single-pile vertical bearing capacity; equivalent pier foundation; extensive calculation
作者簡介:楊文武,高級工程師,一級注冊結構工程師,監(jiān)理工程師,Email:yangwenwuhyjs@126.com。
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