Research on Relationship between Direction of In-situ Stress and Stability of Surrounding Rock
The angle between the direction of the in-situ stress and the roadway axial has a great impact on the stability of the surrounding rock. The research is carried out in a horizontal roadway deep in Xishan branch mine of Sanshandao Gold Mine,and FLAC3D numerical simulation software is used for simulation analysis. The stress distribution and surrounding rock displacement after excavation under five working conditions that angles of the maximum horizontal main stress and roadway are approximately 0°,30°,45°,60° and 90° are studied. The research results show that the maximum main stress of the roadway side is about half of the maximum main stress on both sides of the roadway roof. When the angle between the roadway strike and the direction of the maximum horizontal main stress is 0 ° to 30 °,the most affected are the roadway sides,and attention should be paid to the side support. When the angle α is 30 ° to 60 °,the bearing stress and surrounding rock displacement of the roadway side are close to those of the roof. At this time,the roof and the sides should be supported with the same strength. When α is 60 ° to 90 °,the displacement of the roof is significantly greater than that of the two sides,which is prone to shear failure and attention should be paid to roof support.
In-situ stressnumerical simulationstress distributionsurrounding rock displacement
万方数据
维普
