丁湾水库大坝除险加固及其安全评价

丁湾水库大坝安全类别为三类,需进行除险加固。大坝除险加固采取了坝基与坝肩帷幕灌浆、坝体高喷灌浆、重建排水棱体、上下游护坡等措施。以加固后的典型坝体横剖面为研究对象,采用有限单元法对正常蓄水位、设计洪水位和校核洪水位等工况下的坝体渗透稳定性进行分析,并采用刚体极限平衡法计算相应工况下的坝体抗滑稳定安全系数。计算结果表明:除险加固后,各工况下大坝浸润线位置明显降低,坝体渗流量显著减小,渗透坡降均小于允许渗透坡降,坝体不会发生渗透破坏;抗滑稳定安全系数均大于规范要求,坝身不会发生滑动失稳。

Safety Evaluation and Reinforcement for Dingwan Reservoir

Through evaluation the dam safety of DingWan Reservoir was the third class.It had to reinforce.We choose the reinforcement measures of curtain grouting in the foundation and abutments,high-press gunite in dam body,new prism drainage in slope toe and slope protection on both upstream and downstream faces.Then,we took a typical reinforced dam cross section as an object of research,applied the finite element method to analyze the dam seepage stability under the conditions of normal pool level,design flood level and flood check level.The stability against sliding and safety evaluation was calculated with limit equilibrium method for rigid block.The calculation results show that: after reinforcement dam saturation line is significantly reduced,the dam seepage flow is significantly reduced,penetration gradient is less than the permissive gradient with each condition,the dam seepage failure does not occur,the anti-slide safety coefficient is greater than that of standard requirements and the dam body does not slide instability.