Because the shear strength of the l

Because the shear strength of the layer is very low, the requirement of treatment is to improve the slip resistance and stability ability of the foundation for the low dip dip interlayer, especially for the downstream mud interlayer. In this case, if the interlayer is not buried deep and the amount of excavation is not very large, it is best to excavate thoroughly. If interlayer buried deep, or the thickness of upper interlayer has enough support of rock mass, and victor bedrock deep stability against sliding, can consider to only invisible dam upstream part of the sandwich, and closed processing, cut off the water seepage channel, if interlayer stress variation in the deep, on the foundation is not very significant, and there is no risk of deep sliding, processing mainly the purpose of strengthening foundation, can adopt the general consolidation grouting treatment.