'Double shell' control and support classification in deep roadways. (2015) - Yang, Bensheng
Based on the deformation and destruction characteristics of deep roadways, we developed a 'double shell' support theory, which applied both deep and shallow grouting along with bolts (cable) as the support shells. Through investigation of the support conditions of deep roadways in north China and referring to the Standard for engineering classification of rock masses, we summarised an optimisation table of 'double shell' support schemes in deep roadways. We also determined the parameters on the basis of the 'double shell' support theory, the indices of the rock grade and the mining depth of roadways. Considering the specific engineering condition of the water pump chamber of Xiandewang Coal Mine, we determined the grade of surrounding rock and established the 'single shell' (bolt + steel-mesh + cable + shotcreting + middle-deep grouting) support scheme by referring to the optimisation table. These efforts showed a good supporting effect and validated the applicability of the table.