摘要
针对某病险浆砌石重力坝坝体和坝基渗漏问题,提出了坝面布设土工膜联合坝基帷幕补强的渗漏修复方案,采用有限元法,对大坝开展多工况下渗流场计算,得到了大坝等水头线分布、浸润线高度、渗透坡降及渗流量,重点对土工膜和帷幕的防渗效果进行了论证分析。结果表明,大坝上游面土工膜削减水头显著,膜后坝体浸润线位置低,坝体渗流量小;坝基补强后的帷幕亦有较好的防渗效果,有效限制了坝基渗漏,帷幕渗透坡降小于允许坡降。采用土工膜联合帷幕补强修复浆砌石坝体渗漏是合理可行的。
In view of the seepage of the dam body and dam foundation of a dangerous masonry gravity dam,this paper puts forward the seepage repair scheme of laying geomembrane on the dam surface and strengthening the curtain of the dam foundation,calculates the seepage field of the dam under multiple working conditions by the finite element method for obtaining the distribution of the equal head line,the height of the seepage line,the seepage gradient and the seepage flow of the dam,and emphatically demonstrates and analyzes the anti-seepage effect of geomembrane and curtain.The results show that:The geomembrane on the upstream face of the dam can significantly reduce the water head,the position of the dam seepage line after laying with the geomembrane is low,and the seepage flow of the dam is small.The curtain after reinforcement of dam foundation also has a good anti-seepage effect,which effectively limits the seepage of dam foundation,and the seepage gradient of curtain is smaller than the allowable gradient.Therefore,it is reasonable and feasible to use geomembrane combined with curtain reinforcement to repair the seepage of masonry gravity dam.
作者
王力波
岑威钧
郑长海
WANG Libo;CEN Weijun;ZHENG Changhai(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)
出处
《人民珠江》
2021年第6期107-111,共5页
Pearl River
基金
河海大学大学生创新创业训练计划项目(201910294020)。
关键词
浆砌石重力坝
土工膜
渗流场
渗漏修复
masonry gravity dam
geomembrane
seepage field
seepage repair
