Stability principle of big and small structures of rock surrounding roadway driven along goaf in fully mechanized top coal caving face

Abstract

Based on the characteristics of the surrounding rock of roadway driven along the goaf in a fully mechanised top coal caving face, the stability principle of big and small structures is put forward, which provides the theoretical basis to the application of bolting. The mechanical characteristics of the arc-triangle key block in the main roof and the stability of the roadway during drivage and extraction and the effect on the roadway driven along the next goaf are analysed. The main factors which affect the stability of the small structure of the surrounding rock are discussed. The bolting surrounding strength reinforcement theory is applied to study the important significance of improving the pre-tension of bolting and the support strength. 4 refs., 7 figs., 2 tabs.