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

Zhang Shaobo; Wu Jiansheng; Wei Qun; Dong Huihui

doi:10.13199/j.cnki.cst.2017.04.001

Abstract：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(TSL),the advantages of a TSL in tensile strength,adhesive strength and active support performance are analyzed in comparison with shotcrete and mesh.Research on TSL 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 PF1L,WFP400 have been developed.The applications in Donghuantuo Mine and Wangpo Mine for sealing and gas blocking respectively 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 shotcrete,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 by 3 ～ 5 times.The rising rate of gas concentration in the refuge chamber after application is reduced by about 96.5％.