Abstract：In the light of the distribution rule of coal and gas outburst and the tectonic characteristics of neighboring dominant faults in Panyi mine，a simplified two-dimensional mechanics model is set up to obtain the tectonic stresses around the concave-circular-arc fault. Then，the analytical solutions of horizontal and vertical tectonic stresses of the top wall of fault are derived. These analytical solutions show that there is an area where the vertical stress is increased to 2～3 times more than the rock weight induced stress，which is identical with the numerical simulation result. The study result can be applied to explain why the coal and gas outburst occurs in the top wall of fault and shallow lithosphere.
