Application of a combined support system to the weak floor reinforcement in deep underground coal mine

Abstract More and more coal mines begin to exploit deep resource, leading to more serious supporting problems. Common supporting measures for shallow roadways can hardly apply to the deep geological conditions, which are mainly reflected by high ground pressure, more broken and weak surrounding rock. This paper takes a winch room in China׳s Gubei coal mine as an example to study a new kind of combined supporting system for weak floor under adverse geological conditions. The stability of the winch room is simulated by FLAC3D. The deformation characteristics and stress distribution of the surrounding rock is obtained. Then, a new kind of combined supporting system as well as monitoring measures for the floor is proposed. A new type of hollow grouting cable which has many advantages is introduced in the supporting system. The results show that the combined supporting system is satisfactory.