Study on application of TBM construction technology in coal mine construction in Yunnan-Guizhou area

Yunnan Province and Guizhou Province are important coal production bases in southern China. It has been preliminarily proved that the coal reserves in the hinterland of the south and north in Guizhou Province reach 33 billion tons, of which the coal reserves that can be transported nearby by water reach 9.2 billion tons. There is an urgent need for efficient and safe coal mining. In recent years, TBM (Tunnel Boring Machinel) has been gradually applied in coal mine roadways due to its high degree of intelligence, safety and efficiency, especially in many mining areas in the central and eastern regions. This paper was based on a lot of applied research on TBM Tunnel Boring Machine construction in domestic coal mines, the applicability and advancement of TBM construction technology and the traditional drilling and blasting method in different types of roadway in modern coal mine were analyzed. It is found that TBM construction technology has more obvious advantages in the construction of hard rock roadway because of its efficient rock breaking method, high degree of excavation and support of parallel operation, less disturbance to the surrounding rock during rock breaking, which is conducive to the stability of surrounding rock. At the same time, the comprehensive cost advantage is very significant in the long-distance development of roadway excavation, and the construction of a tunnel can achieve three functions of one roadway, however, the adaptability to the geological conditions is poor. Taking the excavation project of the +1 095 m transport roadway in Juxin Coal Mine of Guineng company as an engineering background, and the roadway support type and construction that meet the characteristics and requirements of the full-section roadheader for rapid construction of coal mine hard rock roadway are proposed. “Guneng No. 2” TBM has achieved the successful application of “small cross-section, large slope, and small turning radius” in practical engineering. Combined conventional tunnel TBM with coal mine roadways with different mining depth and service life characteristics, a unique mining TBM suitable for different types of coal mine roadways has been developed, which greatly improves the efficiency and safety of mine construction. It has important popularization and reference significance for the development of TBM Construction Technology in coal mine field.