This paper briefly expounds the engineering and geological situation of Yuncheng 500 kV Electric substation, and through the comparison of the replacement cushion method, lime-soil compaction method, dynamic tamping method, and pile foundation method, etc.

In the light of the problem existing in the design and construction of collapsible loess foundation that the foundation subsides obviously and cause s damages of the buildings above it, and probes into the working mechanism and a pplication scope of replacement cushion method and compaction pile method.

The paper expounds the significance, methods and applicability of soft soil foundation treatment, and introduces emphatically the replacement cushion method and the heavy-tamping method in deep compaction.

Connecting with the practices of treatments of the soft roadbed, this paper introduces several common treatment methods of soft roadbed, including soil replacement cushion method, tamping method, vibroflotation method and high-pressure rotary method.

Utilizing soilremoval and replacement treats shallow ground of multistoried building;

The common method for treating collapsible loess foundation is soil- bedding method, but because the site is limited in actual construction and the plane treatment scope can t satisfy the requirements of the norms, the lime- soil pile is used as a subsidiary one to cover the shortage of the soil- bedding method.

Engineering application of replacement cushion method;