已建枢纽破坝新建二线船闸防洪影响问题探讨-以清远枢纽为例

摘要

Building the second line ship lock is needed to break down the dam , and the influence of flood prevention is no more a regular issue , because it refers to the impact of the safety to the existing hydro-junction and flood prevention of the river .From the point of view of waterpower management , when the flood prevention impact of this kind of engineering is presented , the following four items should be focus on: first, whether there will be adverse impact on the safety of the existing hydro-junction; second, whether the flood control standard of the projects nearby should be reduced;third, whether there will be adverse impact on the exist-ing river regime;fourth, whether there will be adverse impact on the legitimate rights and interests of the third party .In view of the special nature of the engineering that breaking down the dam , comprehensive means should be used .The flow model in porous media and anti-sliding computing method and finite element model are used to analyze the impact of breaking down the dam on the existing hydro-junction.The physical modeling experiment is used to analyze the impact on river regime and water lever .The results of this paper can provide a reference for similar project that to build second or third line Ship lock in existing hydro -junction on water administrative management and approval .%清远水利枢纽新建二线船闸工程涉及破坝施工，其防洪问题，涉及到新建工程在施工期及运行期对已建枢纽的安全影响及河道防洪影响的问题。该文从水务管理角度，提出在论证该类建设项目的防洪影响问题时，应重点关注水行政主管部门关心的4个问题：①是否对现有水利枢纽安全造成不利影响；②是否降低附近水利工程的防洪标准；③是否对现有河势造成不利影响；④是否对第三人合法水事权益造成影响。鉴于破坝工程的特殊性，应采用综合的研究手段，运用岩土渗流、抗滑稳定计算方法、有限元数值模型等手段研究破坝对已有枢纽的影响及基坑开挖的安全；运用物理模型试验的手段研究工程对河势影响及对现有水利工程防洪水位的影响。该文成果可为类似已建枢纽新建二、三线船闸的水行政管理、审批提供参考。