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四川境内峨眉山地区的地下玄武岩石层是我国西南地区丰富蕴藏着的岩类,其在水电项目建设中时常碰到。玄武岩的自然形成、功能效用及风化弱变,对岩层本体结构及工程性能可产生较深的影响作用。在岩体形成时的层面结构及层次节理是造成层间错位及层内错移的条件。节理间出现的裂隙可对岩层本体的规整程度及小部分岩体构架造成损害,其对岩层本体力学品质的损伤效果能够利用就地实验来获得。层体内外的错动区域决定了整个岩体构架及工程型岩体的相关性能,其为大多工程型地质课题的主要地质外限。
The underground basaltic rock in the Emei Mountain area in Sichuan Province is a kind of rock that is rich in southwest China. It is often encountered in the construction of hydropower projects. The natural formation of basalt, functional utility and weakening of weathering can have a profound effect on the structure and engineering performance of rock mass. The layer structure and the level joint in the formation of rock mass are the conditions that cause the dislocation between layers and the intra-layer slip. The fissures appearing between the joints can damage the regularity of the rock mass and damage to a small part of the rock mass. The damage effect on the mechanical quality of the rock mass can be obtained by using in-situ experiments. The staggered area inside and outside the layer determines the relevant performance of the whole rock mass framework and engineering rock mass, which is the main geological limit of most engineering geological problems.