摘要
针对水电站试蓄水期间出现坝基、坝体和坝肩渗漏问题,为确保大坝挡水结构具有较高安全稳定性,基于实地详细勘查并充分结合工程地质和原设计方案,对大坝结构应力和抗滑稳定性进行了安全复核计算。复核成果表明,设计断面单薄、无专门防渗结构、施工质量差等是引起大坝渗漏的主要原因。大坝中部溢流坝坝段,结构应力和整体稳定性满足规范要求。非溢流坝坝段,坝踵在特殊荷载组合工况下出现0.17~0.18 MPa的拉应力,且左岸坝基安全稳定系数<[2.5]的最小安全限值,需采取措施进行安全加固。
In order to solve the leakage problems in dam foundation,dam body and dam abutment during impoundment period. To ensure the dam structure has a high safety and stability based on the field detailed investigation,engineering geology and original design,the security review of dam stress and stability against sliding has been done. The security review results show that the thin design section,no special impervious structure,and poor construction quality are the main reasons to cause the leakage in dam structure. The central overflow dam' s structure stress and overall stability can meet the regulator requirements. In the non- overflow dam,dam heel has the tensile stress of 0. 17 ~0. 18 MPa in special load combination conditions,and the security and stability factor is smaller than2. 5 which is the regulator's minimum safety limits,and reinforced security measures need to be taken in these dam part.
出处
《水利科技与经济》
2016年第9期87-89,105,共4页
Water Conservancy Science and Technology and Economy
关键词
重力坝
大坝渗漏
结构应力
稳定性
gravity dam
dam seepage
structural stress
stability
