关键词: 交叉巷道, 应变软化, 交叉角度, 沉降, 稳定性

Abstract: Abutment pressure zone and roof unloading area in the roadway intersection are superimposed. Therefore, in the roadway intersection, perturbation range of the surrounding rock is greater than other parts, which leads to intensified deformation and increased original support stress, is not conducive to the stability of the roadway. In order to analyze the stability of roadway intersection, finite element simulation software is used to simulate the five kinds of typical examples and analyze the deformation of the roadway intersection. At the same time, because most of the geomaterials have the strain-softening characteristics, the rock mass characteristics of strain softening are taken into account. The result shows that: in the roadway intersection, due to the abutment pressure superimposed, the surrounding rock deformation of the roadway is further increased. For the roadway intersection, different crossover angles influence the deformation of roadway intersection differently. The specific performances are for the main roadway (roadway1), the smaller the cross-angle is, the greater the deformation degree of acute angle side is; the bigger the cross-angle is, the greater the deformation degree of obtuse angle side is. Because the cross angles of these five model are different, the largest roof settlement areas of the main roadway (roadway 1) show different degrees of offset to the acute angle side, and the smaller the cross-angle is, the more obvious offset phenomenon is. The results also show that: the deformation of support lane (roadway 2) is also affected by cross-angle. The smaller the cross-angle is, the greater the deformation of the roadway is. The results can provide reasonable references to design and support for similar engineering.

Key words: roadway intersection, strain softening, cross-angle, settlement, stability