加宽堤防渗流与变形特征数值分析  

A Numerical Analysis of Seepage and Deformation Characteristics of Widened Levee

作　　者：郝伟[1] 樊恒辉[1] 党进谦[1] HAO Wei;FAN Heng-hui;Dang Jin-qian(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,712100,Shaanxi Province,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《中国农村水利水电》2018年第12期149-155,160,共8页China Rural Water and Hydropower

摘　　要：为了解堤防加宽后渗流和变形特性,以典型加宽堤防为例,将黏性土和砂性土分别作为旧堤和新填筑堤身的材料类型,运用数值分析软件对常水位作用下的加宽堤防进行渗流和变形数值计算。结果表明,新旧堤身交界面处含水率等值线不连续,总水头等值线被交界面所排斥,含水率和总水头出现急剧降低;渗透坡降在交界面处和加宽堤防坡脚处出现显著变化;交界面处含水率、总水头和渗透坡降的变化率随着堤身高度的增加而增加;堤身最大沉降出现在新堤堤肩处,沉降量与临水侧水位高度有关系,堤基的竖向变形呈马鞍形,加宽堤防的横向变形呈现出旧堤和新堤分别向外侧移动的趋势。渗流场的变化是在河流水渗流作用下,由于加宽堤防新、旧填料性质差异所造成的;变形是在新填堤防的自重作用下,渗流场影响应力场而造成的。Take typical widened levee for example,taking clay and arenosol serve as materials of old levee body and widing body,the paper uses numerical analysis software to calculate the seepage and deformation characteristics of widened levee under water level.The results show that the water content contour line is discontinuous at the intersection of the old and new levee body,the total water head contour line is rejected by the interface,and the water content and the total head appear sharply lower.Seepage slope significantly changed at the interface and widened subgrade toe.The maximum settlement of the widened levee appears at the shoulder of the new levee,and the settlement is related to the height of the water level.The vertical deformation of the levee foundation is saddle shaped.The lateral deformation of the widened levee shows the trend of the old and the new levee moving outwards.The change of the seepage field is caused by the difference of the new and old filling properties of the subgrade under the seepage action of river water.Deformation is caused by the influence of seepage field on the stress field under the effect of new levee self weight.

关 键 词：加宽堤防 渗流 变形 沉降 数值分析 

分 类 号：TV871[水利工程—水利水电工程]