海堤沉降计算中修正剑桥模型参数灵敏度分析  

Parameters sensitivity analysis of modified Cambridge model in settlement calculation of seawall

作　　者：李文翔[1] 刘曙光[1,2] 阮春生 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学水利工程系,上海200092 [3]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《水运工程》2013年第4期32-36,共5页Port & Waterway Engineering

基　　金：科技部科技基础性工作专项重大项目(2007FY110300-03);国家自然科学基金项目(50979071)

摘　　要：采用数值方法分析软基上的海堤沉降问题时,模型参数的确定是数值分析的重要内容之一。结合东海大桥港桥连接段的海堤工程数据,对修正剑桥模型在海堤沉降计算中的参数灵敏度进行分析。结果表明,初始压缩曲线的斜率λ和破坏曲线的斜率M对海堤沉降的影响最大,当λ和M的取值在±20%范围内波动时,沉降的变化率也会在大概±20%的范围内变化;而回弹斜率κ,渗透系数k,泊松比v和截距ea对海堤沉降的影响非常小,当这些参数在±20%范围内波动时,最终沉降的变化率只有±1%左右;另外,渗透系数k虽然不能改变最终沉降,但是却能对地基的固结性状产生较大的影响。所以为了能准确分析海堤沉降问题,在参数取值中,应当注意提高λ,M和k的精度。It is one of the most important steps in determining the value of model parameters in the analysis of the seawall settlement on the soft ground by numerical methods. Combining the seawall engineering data of the Donghai bridge, we analyze the parameter sensitivity of the modified Cambridge model in the calculation of seawall settlement. The resuhs show that the slope of the initial compression curve 2 and the slope of the failure curve Mhave the greatest influence on the seawall settlement. When the values of λ and Mfluctuate in the range of ±20%, the changing rate of settlement also fluctuates in the range of ± 20% .While the rebound slope κ, permeability coefficient k, Poisson＇s ratio v and intercept ea have very little influence on seawall settlement. When these parameters fluctuate in the range of ±20%, the changing rate of final settlement only fluctuates in the range of ±1%. Besides, although permeability coefficient k can＇t influence the final settlement, it has a great influence on the consolidation behavior of the foundation. As a result, in order to analyze the problem of seawall settlement more accurately, more attention should be paid on the values of λ, M and k.

关 键 词：海堤 沉降 修正剑桥模型 灵敏度分析 

分 类 号：TU43[建筑科学—岩土工程]