摘要
为了对某拟建重力坝的防渗帷幕深度进行优化设计,通过有限元渗流计算,从坝体抗滑稳定、渗流变化规律、应力和坝基破坏模式等4个方面研究了不同防渗帷幕深度对重力坝稳定性的影响。研究结果表明:随着防渗帷幕深度的增加,大坝抗滑稳定系数逐渐增大,并最终趋于稳定;当防渗帷幕插入到基岩后,渗流流速和渗流量均大大减小,防渗帷幕底部坡降最小值对应的帷幕深度为4~6 m;随着防渗帷幕深度的增加,帷幕所受最大剪应力先增大后减小并最终趋于稳定,坝基垂直应力满足地基承载力要求;重力坝破坏模式与防渗帷幕深度无关,均为浅层滑动。计算成果对类似工程防渗帷幕深度优化设计有一定参考价值。
In order to optimize the depth of a proposed dam anti - seepage curtain, through finite element seepage calculation, studied the dam anti slide stability and seepage field distribution, force and foundation of the dam failure mode of different depth of diaphragm curtain. The results indicate that： with increasing of the curtain depth, the anti - slide stability coefficient increases gradually, and tends to be stable finally. When the curtain is inserted into the bed rock, the seepage flow are greatly reduced, and the bottom of the gradient corresponding to the minimum value of curtain depth between 4 - 6m; with increasing of the depth of the wall, maximum shear stress of the curtain increases and then decrease and tends to be stable finally, the vertical stress of dam foundation meets the requirement of foundation bearing capacity; the failure modes of gravity dam are shallow sliding, which is not related to the depth of curtain. The results could provide some references to the design of the depth optimization of the similar projects.
作者
王博
WANG Bo(Shanxi Province Fenhe Reservoir Management Bureau, Taiyuan 030006, Chin)
出处
《人民珠江》
2017年第2期78-83,共6页
Pearl River
关键词
防渗帷幕
渗流
稳定系数
垂直应力
anti- seepage curtain
seepage
stability coefficient
vertical stress
