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建筑在软弱岩基上的高心墙土石坝的地基处理,直接关系到大坝工程的施工质量、稳定安全和经济效益,是土石坝建设中关键性的技术问题之一。已经建成并按正常高水位运行多年的升钟水库拦河大坝的建设,为解决这类技术问题提供了一个较好的实例。本文主要分析了升钟水库大坝区的区域地质、工程地质条件及软弱岩基特性,叙述了大坝心墙防渗体与基岩接合部位、过渡区及坝壳区的地基处理以及心墙下部基岩内部处理的设计和施工技术及其质量标准,而且对其实际效果进行了综述。
The foundation treatment of high-core earth-rockfill dam built on soft rock base is directly related to the construction quality, stability, safety and economic benefits of the dam project. It is one of the key technical problems in the construction of earth-rockfill dam. The construction of a river dam dam that has been built and operated at normal high water level for many years provides a good example for solving such technical problems. This paper mainly analyzes the regional geology, engineering geological conditions and the characteristics of soft rock foundation in Shengzhong Reservoir Dam Area, describes the foundation treatment of the dam core wall impervious body and bedrock joint, transition zone and dam shell area, The design and construction technology of the internal treatment of the lower bedrock and its quality standards, and an overview of its actual effect.