古老变粒岩地区 ,岩体风化剧烈、风化深度大且各处风化深度差异极大 ,地表多呈散砂粒状 ,该文对其在水利水电工程地质勘察中遇到问题进行了深入研究 ,初步掌握了古老变粒岩区岩体风化规律 In the ancient granulite area, the rock mass is weathered violently, the weathering depth is large and the weathering depth is very different in all places. The surface of the granite is mostly in the form of loose sand and granule. This article has carried on the thorough research to the problems encountered in the geotechnical investigation of hydroelectric engineering, Grasp the weathering rule of the ancient granulite rock mass