硬壳层软土地基竖向附加应力分布研究  

Vertical Additional Stress of Soft Soil Foundation with Upper Crust

作　　者：张军辉 江伟唯[1] 郑健龙[1] 

机构地区：[1]长沙理工大学公路工程教育部重点实验室,长沙410004

出　　处：《长江科学院院报》2011年第5期42-45,共4页Journal of Changjiang River Scientific Research Institute

基　　金：交通部西部交通科技项目(2009-318-000-062);交通部西部交通科技项目应用基础研究项目(2009-319-825-090);湖南省教育厅项目(08C100);长沙理工大学公路工程省部共建教育部重点实验室开放基金资助项目(kfj090105)

摘　　要：采用有限元法对条形均布荷载作用下硬壳层软土地基竖向附加应力进行数值模拟,得到了不同厚宽比及模量比时层间竖向附加应力系数,编制了表格以便查询;通过二元回归分析得到了厚宽比、模量比与层间竖向附加应力系数的近似函数关系;结合"等效深度"概念,推导了一个硬壳层软土地基竖向附加应力分布的计算公式,并通过实例验证了计算公式的有效性。The distribution of vertical additional stress of soft soil foundation with upper hard crust under uniform strip load is numerically simulated by finite element method.Through the simulation,the coefficients of interlayer vertical additional stress with different ratios of crust thickness to load width and ratios of crust modulus to soft soil modulus are obtained,and tables with these coefficients are given for reference.Furthermore,an approximate function of these coefficients versus ratio of crust thickness to load width and ratio of crust modulus to soft soil is presented using binary regression analysis.Finally,a calculation formula for vertical stress of soft soil foundation with upper hard crust is deduced based on the concept of equivalent depth,and the validity of this formula is verified by case calculation.

关 键 词：硬壳层 软土地基 竖向附加应力 沉降 二元回归分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]