摘要
为了研究水位变化对重力坝坝基稳定性的影响,以拟建燕云电站重力坝为例,采用有限元软件PLAXIS计算了坝体在水位上升过程中的抗滑稳定,重点研究了重力坝坝基破坏模式、抗滑稳定系数、塑性破坏区、渗流场以及防渗帷幕受力的变化情况。结果表明:水位上升对重力坝坝基破坏模式影响显著,水位较低时为浅层滑动,水位升高后为表层滑动;水位上升将导致坝基抗滑稳定系数减小,坝基塑性破坏范围增大,在坝踵处集中分布;防渗墙底部渗流速度最大,两侧剪应力主要分布在墙体中部与岩层交界处。研究成果对工程的顺利开展有一定指导意义。
In order to study the influences of changing of water level on the foundation stability of gravity dam,this paper took Yanyun hydropower station dam as an example,and adopted PLAXIS to calculate the anti-sliding stability under water level rising conditon. We studied the dam failure mode,stability coefficient,plastic failure zone,seepage field and shear stress of cutoff wall. The results shows that the failure mode is effected by water level rising remarkbly,the shallow slide appears when the water level is low,however when the water level is deep,the failure mode is the surface sliding and water level rising will lead the decreasing of sliding coefficient,dam foundation plastic damage range increases,which centralized at the dam heel; the biggest velocity appeared at the bottom of diaphragm wall,both sides shear stress distribute during the minddle wall and the rock junction.
作者
周丹
杜修娟
ZHOU Dan DU Xiujuan(Sichuan Water Conservancy Vocational College, Chengdu, Siehuan 611231, China School of Energy and Power Engineering, Xihua University, Chengdu, Sichuan 610039, China)
出处
《水利与建筑工程学报》
2017年第1期151-156,170,共7页
Journal of Water Resources and Architectural Engineering
基金
西华大学研究生创新基金项目(ycjj2015162)
