摘要
隔河岩大坝为重力拱坝,最大坝高151m。大坝座落在倾向上游的石灰岩上,灰岩下为弱透水的页岩。石灰岩中岩溶发育,透水性极不均一,按透水性可分成7个区。采用平面有限元法和三维电阻网模拟试验对坝基渗流进行研究,以优化渗控措施。根据概化的地质模型进行计算和试验的结果,并注意到对水库渗漏量和地下水位的影响都不大的条件下,作者认为,初步设计中所确定的灌浆帷幕的深度可以适当缩短,但当断层下切较深,深层又存在强透水带,且其透水性ω>0.11/min·m·m时,则这种部位的帷幕应切断这种强透水带。此外,右岸帷幕的长度也可适当缩短。
The Geheyan dam is a gravity arch dam, with a maximum height of 151 m. It is founded on the limestone stratum which dips to the upstream and is karstified. There is a shale straum underlying the limestone. In accordance with its seepage parameter, the limestone stratum can be divided into seven zones. On an hydrogeologic model, the conditions of the seeppage flow through the dam foundation has been studied using 2 —D FEM and 3-D electric resistance network analog experiment to find the optimal seepage control measures. In the light of the results obtained, the author suggests that the depth of the grout curtain which was designed in the preliminary design stage may be suitably reduced. but wherever the fault fracture runs deep together with the existance of the high permeability zones with permeability greater than 0. 1~2/min. m. m the grout curtain should reach enough depth to intercept these zones. Furthmore, the length of the curtain line on the right bank may be suitably reduced also.
出处
《人民长江》
北大核心
1992年第11期29-32,共4页
Yangtze River
关键词
有限元
三维电阻网
重力拱坝
FEM calculation
3—D electric resistance network analog experiment seepage flow
