摘要
结合Midas/GTS有限元分析软件,以某大型水电站围堰工程为例,通过计算分析得出了深厚覆盖层地基高土石围堰在完建期和蓄水期两种工况下的应力变形特性。结果表明:在两种工况下,堰体垂直位移的方向均竖直向下,最大值发生在堰体底部;完建期堰体及堰基的水平位移呈现两种趋势,上游部分水平位移指向上游,下游部分水平位移指向下游,蓄水期堰体及堰基的水平位移均指向下游;堰体的大、小主应力分布基本均为压应力,并从堰面向堰内逐渐增大,最大值发生在堰体底部的防渗墙附近,在防渗墙周边应力较为集中、梯度相对较大。
Based on the finite element analysis software Midas/GTS, and taking a large hydro-power station as an example, this paper analyzes through calculations the stress-deformation behaviors of the high earth-rock cofferdam on deep overburden foundation both in the construction period and impoundment period. The results show that under the two conditions, the direction of the vertical displacement of the cofferdam is downward with the maximum value occurring at the bottom; In the construction period, the horizontal displace-ments of the cofferdam and its foundation show two trends: the horizontal displacement of the upstream part is to the upstream and the downstream part to the downstream; in the impoun-dment period, the horizontal displacement of the cofferdam and its foundation are both to the downstream; The large and small principal stress distribution of the cofferdam is mainly comp-ressible stress, which gradually increases from the surface to the center, and the maximum occurs near the cut-off wall, and the stress is concentrated in the cut-off wall surrounding with relatively large gradient.
出处
《电网与清洁能源》
北大核心
2015年第12期121-125,共5页
Power System and Clean Energy
关键词
深厚覆盖层
高土石围堰
有限元分析
应力变形特性
deep overburden foundation
high earth-rock cofferdam
finite element analysis
stress-deformation behavior
