Abstract: In this paper, taking one mine as the engineering background, different numerical models of roadway intersection were established, and the deformation laws of surrounding rock in different roadway intersections were analyzed. Meanwhile, the security analysis method which both considering shear and tensile damages was used to analyze the security situation of surrounding rocks in roadway intersection. The results show that the surrounding rock deformation of roadway intersection shows different offset degrees to the acute angle side, and the smaller the intersection angle is, the more obvious the offset phenomenon is. Thus, the smaller the intersection angle is, the larger the scope needed to strengthen support in the acute angle side of roadway intersection. Meanwhile, due to the enlargement of disturbance to surrounding rock in roadway intersection, the roof and floor safety coefficient are relatively low in roadway intersection, and the regions where the safety coefficients is less than 1 are greater than other parts of roadway. Moreover, the safety coefficient of corner rock pillar from exterior to interior shows gradient changes, and the safety coefficient of rock mass outside the corner rock pillar is the smallest, which will be damaged first, and then develops gradually to the internal. When the intersection angle is too small, the percentage of damage area of corner rock pillar in the acute angle side is relatively larger, which is not beneficial to the stability of roadway. The results can provide reasonable references to roadway support in similar engineering conditions.

Key words: intersected roadway , deformation law , safety coefficient , stability