| 复合桩基地基极限承载力的下限有限元解 |
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| 引用本文： | 蒋刚,孙君,王旭东. 复合桩基地基极限承载力的下限有限元解[J]. 岩土工程学报, 2011, 0(1) |
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| 作者姓名： | 蒋刚 孙君 王旭东 |
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| 作者单位： | 南京工业大学交通学院;常州市规划设计院; |
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| 基金项目： | 国家自然科学基金项目(50478005); 江苏省自然科学基金项目(BK2004420); 江苏省“青蓝工程”(优秀青年骨干教师资助) |
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| 摘 要： | 复合桩基在达到整体极限承载状态时,因桩的遮拦作用使得地基极限承载力较天然地基有一定提高。其分析可简化为地基竖向极限承载力和地基土水平向绕桩作用产生的极限承载力提高值的叠加。利用下限有限元方法,求解得到地基的极限承载力和不同深度处土体绕桩阻力的数值解,并建立了绕桩阻力计算公式。绕桩阻力系数ks随桩间距的增加而逐渐减小。地基极限承载力提高值Δfu随桩间距的增加而逐渐降低。计算表明:复合桩基下绕桩阻力存在并不可忽视,承台下地基极限承载力有明确的提高,可以作为地基的安全储备。
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| 关 键 词： | 复合桩基 绕桩阻力 极限承载力提高值 下限有限元 |
Finite element lower bound limit solutions for ultimate bearing capacity of subsoil under raft of composite piled foundations |
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| JIANG Gang,SUN Jun,,WANG Xu-dong. Finite element lower bound limit solutions for ultimate bearing capacity of subsoil under raft of composite piled foundations[J]. Chinese Journal of Geotechnical Engineering, 2011, 0(1) |
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| Authors: | JIANG Gang SUN Jun WANG Xu-dong |
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| Affiliation: | JIANG Gang1,SUN Jun1,2,WANG Xu-dong1(1.College of Civil Engineering,Nanjing University of Technology,Nanjing 210009,China,2.Changzhou City Planning and Design Institute,Changzhou 213003,China) |
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| Abstract: | When the composite piled foundation reaches the general ultimate bearing capacity status,an increment of the ultimate bearing capacity for natural foundation is induced by barrier effect of piles.The analysis of the problem can be simplified for both the sum of the vertical ultimate bearing capacity of foundation and the increment of the ultimate bearing capacity of foundation soil horizontally sliding around piles.Based on the finite element plastic lower bound limit method,the numerical solutions for the ... |
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| Keywords: | composite piled foundation resistance around pile increment of ultimate bearing capacity finite element lower bound limit method |
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