Learning from the successful experience in expressway passing through coal mine-out area,based on a scientific analysis,appraisal was made the mine-out area deformation and the stability of cover rock in the area,and full filling pressure grout injection method was adopted as the engineering measure for dive.

This paper introduces the main methods,raw materials needed and equipment requirements of treating the mined-out area under the superhighway by using full-caving pressure-grouting method,and expounds the methods for the technical control,raw materials test and construction quality control in the construction.

Connecting with the actual situation of the construction, and according to the features of the coal gob area, this paper introduces the treatment of the geological hazards for the foundation by using completely filled grouting.

Based on treating mined-out region engineering with grouting method on one expressway,this paper studies the designing method and construction techniques.

Based ontreating multilayer mined-out region engineering by grouting method,this paper studies the designing and computing method, construction tech-nics.