水坝工程中强蚀花岗岩的改良研究

Study on improvement of strong corrosion granite in dam project

选取我国西北某地区水电站坝区内的强蚀变花岗岩作为研究对象,针对强蚀变花岗岩具有经浸水饱和后压缩量增大即遇水软化、强度衰减即水稳定性差等物理及力学性质,不宜直接用于工程坝基填筑需进行改良。设计不同掺灰比,将水泥和生石灰作为改良剂对强蚀变花岗岩进行改良。对比分析改良前后强蚀变花岗岩试样的物理特性,发现两种改良剂均使其各性能得到显著改善。综合对比两种改良剂的性质最后确定最优化改良方案是7%掺灰比的水泥改良剂。

Select strong corroded granite in the dam area of a hydropower station in a region of northwestern China as the research object. Regarding the strong physical alteration properties of granitic rocks, such as water softening, strength decay, water stability and so on, they should not be directly used for engineering dam foundation filling, and need to be improved. With different ash blending ratios, refine strongly corrosive granite with cement and quicklime as modifiers. By comparing the physical properties of the strongly altered granite samples before and after the improvement, it is found that the two modifiers have significantly improved their properties. Comprehensive comparison of the nature of the two modifiers finally determines that the optimal improvement of the solution is 7% cement quicklime mixed ratio modifier.