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The paper proposes the scheme of split-level which is for the problems of downslide of roadway and flying refuse and slice slope in pseudo-inclined working face of thick seam with large dip angle in Suhanghe Coal Mine. The instability mechanism of supports is analyzed by establishing a mechanical model of its stability, and it shows that the slope section plays a key control role in controlling the equipment sliding. It can effectively reduce the sliding trend of the supports and improve the stability of the supports. Through numerical simulation, the law of strata pressure in working face is analyzed. The stress release zone and tensile failure zone of working face roof are asymmetrically distributed, and the tensile failure zone corresponds to the collapse line. Based on the field measurement, the adaptability of the support is analyzed. The support can meet the demand of safe production. The strength of the working face is not symmetrical. The rock pressure in the middle of the working face is the strongest, the dynamic load coefficient is 1.66, followed by the upper part, and the lower part is relatively flat.

To explore the relationship between permeability characteristics of rock mass and stress field and temperature field, the mechanical behavior law of rock mass under coupling conditions is further obtained. Under the coupling conditions of temperature field, seepage field and stress field, the numerical simulation of triaxial compression tests of rock mass with different confining pressure gradients and Darcy permeability coefficients is carried out. This paper shows that the confining pressure chamber is one of the factors that influence the permeability of rock mass. Under the same conditions of other fields, the larger the confining pressure, the lower the permeability of rock mass. The stress field acting on the rock mass has obvious influence on the seepage field flowing through the rock mass. The influence of seepage field through rock mass on temperature field inside rock mass is dominant. The effect of stress field acting on rock mass on the temperature field of rock mass distribution is not very significant. The triaxial compression test simulation of rock mass under multi-field coupling condition shows that the end effect is remarkable, the stress distribution at the edge is concentrated, and the stress distribution of rock mass is symmetrical.