The weak interlayer mainly refers to the interlayer with low strength between bedrock layers or in the middle of fracture planes that has been mudded or easily melted.The treatment method of soft interlayer depends on the occurrence of the interlayer and the stress condition of the foundation.For the interlayer with steep dip Angle, if it is not connected with the reservoir, the method of excavation and backfilling concrete can still be used to solve the bearing capacity problem of the foundation.