关键词: 高应力, 软岩, 巷道支护, 变形机理

Abstract:

According to the problem of roadway in high stressed soft rock with large deformation of surrounding rock, serious failure of support structure, in spite of roadway maintenance in No.2 coal mine of Zhaogu, deformation mechanism of roadway in high stressed soft rock is studied with the application of laboratory testing, theoretical analysis and field measurement. The result indicates the surrounding rock is integrated in a short time after roadway excavation. But the mechanical properties of shallow part of surrounding rock is changed. Strength decreases rapidly and surrounding rock deformation increases sharply. Support resistance can inhibit the surrounding rock deformation when it reaches some range. However, plastic zone and deformation can’t be changed when the support resistance exceeds the range. The proposed plan on surrounding rock controlling is fast anchor net spray firstly, reservation deformation in 520mm in advance secondary support which uses U-shape steel. Field application shows that the plan can effectively control the deformation of surrounding rock of roadway in high stressed soft rock.

Key words: high pressure, soft rock, roadway support, deformation mechanism