摘要
水帘水库大坝为浆砌石重力坝,水库自建成后出现两岸坝肩裂缝、坝内排水廊道底板渗水、挑流鼻坎两边挡水墙裂缝等问题,一直处于带病运行状态。为掌握大坝安全状况,根据水帘水库地质勘探和大坝安全鉴定现场检测资料,通过参数反演,对非溢流坝段和溢流坝段的典型断面进行二维渗流有限元法计算分析,全面评价了水帘水库大坝的渗流安全状况。结果表明:水帘水库上游防渗面板防渗效果下降,坝踵建基面处渗透坡降较大;在设计和校核工况下,大坝坝基扬压力较大,坝基排水孔处扬压力折减系数大于设计折减系数,大坝渗透稳定性不满足规范要求。
Shuilian reservoir dam is classified as masonry gravity dam ,which now faces the problems of cracks on both sides of the abutment ,seepage from the floor of the discharging channel within the dam and cracks on the retaining wall beside the flip bucket after the completion of the construction .This unhealthy operation state poses a great threat to the safety of this dam .In order to understand the status of the dam safety ,according to the data of the geological survey and dam safety field tests ,two-dimensional seepage finite element analysis of the typical cross sections in the overflow and non-overflow dam sections was conducted with the parameter inversion method .Based on the analysis ,the safety status of the seepage flow in Shuilian reservoir dam was evaluated comprehensively .The evaluation results indicate that the func-tion of the anti-seepage panel in the upstream of the dam is failing with a larger seepage slope gradient at the dam heel foundation;under the design and check conditions ,the uplift pressure of the dam foundation is increased ,the value of the uplift pressure reduction coefficient of the drainage holes at the dam foundation is smaller than the design value , which leads to the conclusion that the stability of the dam seepage can not meet the requirements of the codes .
出处
《水利与建筑工程学报》
2015年第5期218-222,共5页
Journal of Water Resources and Architectural Engineering
关键词
浆砌石坝
现场检测
参数反演
渗流
二维有限元
masonry dam
field test
parameter inversion
seepage
two-dimensional finite element
