裙板式条形基础在黏性土中的承载力分析

饱和黏性土上的浅基础常会面临地基承载力不足的问题,常规的方法是采用深基础或进行地基处理,往往增加了不必要的造价。此时如果能寻找到一种具有更高承载力的浅基础,将能有效解决这类问题。受到国外海上平台使用裙板式基础的启发,提出一种裙板式条形基础。通过设置竖向裙板将有效约束基底土的剪切滑动,从而显著提高极限承载力。采用有限元建立了黏性土上裙板式条形基础的计算模型,通过数值模拟对比分析了裙板式基础和实体基础的承载力和破坏模式。分析表明,裙板式基础拥有相同高度的实体基础的承载力,但更节省材料、施工更简便。通过理论分析,推导出裙板式条形基础在黏性土中的承载力计算公式,并对比验证了公式计算结果的准确性。

Study of Ultimate Bearing Capacity of Skirt StripFoundation over Undrained Clay

Lack of enough bearing capacity is often a problem in shallow foundation over saturated clay. The common solutions are pile foundation or soil improvement which will cause unnecessary cost. Looking for a shallow foundation with higher bearing capacity will be an alternative solution for this conflict. Inspired by the skirt foundation in the abroad offshore platform, a new type of skirt strip foundation was put forward in the paper. This foundation can obviously increase the ultimate bearing capacity of the ground by restricting the shear slide of the underlying soil through vertical skirts. The numerical model of skirt strip foundation over undrained clay was built first. Then the bearing capacity and failure mode of the skirted foundation and the embedded foundation were compared. Analysis showed that the bearing capacity of skirt foundation was identical to that the embedded foundation of the same height. The skirt foundation had the advantages of convenient operation and material saving. The computing equation of bearing capacity was derived by theoretical analysis and the precision of the presented equation was verified by comparison.