Theory and practices on thin sprag-on technology of coal mine

In order to meet the requirements of the mine rapid support, safety and environment protection, based on the support idea of the thin spray-on liner ( TS L)，the advantages of a TSL in tensile strength, adhesive strength and active support performance are analyzed in comparison with shotcrete and mesh. Research on T SL for coal mines in China has been carried out, the achievements of which includes that two non-reactive TSL products for sealing and surface gas blocking have been fixed, and two types of injection machine PF1 L, WFP400 have been developed. The applications in Donghuantuo Mine and Wangpo Mine for sealing and gas blocking r espectively have been implemented. It is suggested that the environmental performance of this newly developed TSL products has met the standard of indoor building materials, qualified with very outstanding film-forming performance as well as a tensile strength of 3.5 ~ 7.8 MPa. The applications indicate that, compared with shotcret e, material handling can be reduced by 90.0% and material mixing procedure can be canceled, thus the application rates of TSL setting only need 3 workers which can be improved by3 ~ 5 times. The rising rate of gas concentration in the refuge chamber after application is reduced by about 96.5%.