刚性下卧层的存在会造成地基中的附加应力,产生应力集中现象,并对上层地基的沉降变形造成影响。笔者利用地基变形放大系数分析刚性下卧层对地基变形的影响,通过数值模拟的方法,对不同模量比和地基土相对厚度时的地基变形放大系数进行了研究。结果表明:上下土层的模量比对变形放大系数有直接影响,不可忽略; 当刚性下卧层上方土层厚度与基础宽度比值大于5.0时,地基变形放大系数的数值可认为接近于零。
Abstract
Additional stress concentration occured in the subsoil because of the existence of rigid ground, and the settlement of upper layer will be influenced. The method of new code which consider the influence of rigid ground by enlarge coefficient of settlement can be used for reference. Through numerical simulation, the enlarge coefficients of different modulus ratio and different layer thickness are researched. Analysis result shows that the modulus ratio of upper layer and rigid ground has effect on settlement, and when h/b of settlement greater than 5.0, the enlarge coefficient is colse to zero.
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基金
收稿日期:2013-10-23 修回日期:2014-01-08
基金项目:国家住建部研发项目(2011-K3-33); 江苏高校优势学科建设工程资助项目(PAPD)
第一作者:赵志峰,副教授,博士。E-mail:zzf0911@163.com
引文格式:赵志峰,杨帆. 刚性下卧层对地基变形影响的计算方法[J]. 南京林业大学学报:自然科学版,2014,38(5):139-142.
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