The treatment of underground mining openings under highway is a challenging task in highway construction. Although there are many research achievements and engineering prctices in railway and building engineering

the theoretical and engineering techniques to treat the underground mining openings under highway are still lack of success. Based on the pilot project of grouting engineering treating multi-layered underground mining openings filled with water located on east of Xuzhou

Jingsu province

the design and construction technique of grouting are presented in this paper. The design issues such as treating area

composition of grouting material

borehole distribution

techniques of drilling

techniques to solve problems during grouting are discussed in some details. From the field practice

the diffusion radius of grouting

grouthing quantity of single bore and criterion of ending grouting are put forward

resulting in effective design and construction technique for treating underground mining openings under complicated geological conditions.