考虑渗流场和应力场耦合对混凝土坝位移的影响研究  

Study on the Effect of the Couple of Seepage Field and Stress Field on the Displacement of Concrete Dam

作　　者：黄耀英[1] 沈振中[2] 田斌[1] 王润富[2] 

机构地区：[1]三峡大学土木水电学院,湖北宜昌443002 [2]河海大学水利水电工程学院,江苏南京210024

出　　处：《水力发电》2009年第8期18-21,共4页Water Power

基　　金：国家自然科学基金资助项目(50679036)

摘　　要：采用等效连续介质模型研究了考虑渗流场和应力场耦合对混凝土坝位移的影响,结论为:①由于上游岩基内存在拉应力区,使其渗透系数增大,导致考虑耦合分析时岩基内的等水头线较不考虑耦合时偏向下游,且坝基扬压力较大。②考虑耦合与不考虑耦合对大坝垂直位移的影响略大于对水平位移的影响,但总体影响较小。无论是否考虑耦合,在岩基上作用渗流体荷载引起坝顶相对于基点的水平位移都是向上游的位移。③由于在上游岩基内存在拉应力区,渗透系数增大,从而使水平向和垂直向渗流体积力减小,导致岩基内水平向应力等值线较不考虑耦合时向下游移动,垂直向应力等值线向上游移动。The effect of the couple of seepage field and stress field on the displacement of concrete dam was studied based on equivalent continuum medium model. Some conclusions were obtained： ① due to tensile stress area exists in the upstream rock foundation, the seepage coefficient increases, equipotential head line downstream and the dam base uplift bigger than that calculated by no considering seepage field and stress field couple; ②when considering the couple of seepage field and stress field, the effect on vertical displacement of dam is bigger than that on horizontal displacement. Whether considering the couple of seepage field and stress field or not, the relative displacement upstream by the seepage volume force in the foundation; ③Since tensile stress in the upstream rock foundation, the seepage coefficient increases, seepage volume force reduce. Horizontal stress isoline moves to downstream and vertical stress isoline to upstream.

关 键 词：渗流场 应力场 耦合 位移 混凝土坝 

分 类 号：TV311[水利工程—水工结构工程]