Determination and application of the support resistance of surrounding rock around deep tunnels

The support resistance of surrounding rock in deep tunnels is determined by the pressure and displacement of surrounding rock obtained by theoretical calculations and the relationship between the support and displacement analyzed by the P-U figure. The range of the support resistance can be determined based on the quantitative calculation of pressure and displacement of the surrounding rock of the deep tunnel, and the support scheme and schedule can be selected considering the relationship between the surrounding rock and support in the P-U figure. This method has been applied to the support of the pump chamber of the Longgu coal mine, and the results show that: (1) The calculated pressure and displacement of the surrounding rock conform with engineering practice and the reasonable range of support resistance of a pump chamber is 4 ~ 6MPa; (2) The support scheme and schedule can be determined based on the support resistances and P-U figure; (3) The achievements have been successfully applied to coal mine engineering.