SUPPORT TECHNOLOGY OF POLYPROPYLENE FIBER CONCRETE SHOTCRETE LAYER AND ITS APPLICATION TO GUQIAO COAL MINE
聚丙烯纤维混凝土喷层支护技术及其在顾桥矿区的应用

According to mechanical principle of polypropylene fiber concrete structure, the applicability of polypropylene fiber concrete in the coal mine spray tunnel protection is researched. Combined with the typical anchor spray tunnel of Guqiao Mine, the reasonable proportion, tension, resistance of compression and shear of polypropylene fiber concrete spray layer are completed by laboratory test. Compared with the general concrete spray layer, the stress distribution is more homogeneous and the yield capacity is better. Industrial experiment shows that the tensile strength and toughness of the polypropylene fiber concrete spray layer are higher than those of general one. The rebound of the polypropylene fiber concrete is low and the construction technology is simple. Therefore, it has wider application.