Abstract: According to the problem of creep damage and reinforcement of roadway and chamber groups influenced by mining with high abutment stress and weak adjacent rock in Hebi 9th Colliery, strengthening method has been proposed, characterized with full cross-section, shallow-deep hole grouting and two-ended cables. The instability mechanism of roadway and chamber groups with high abutment stress has been studied by means of analogue simulation. The study has shown that as the top pressure increases, displacement of chamber rock pillar increases; bearing capacity of pillar decreases; loads of two-ended cables increases at first, then adjusts continuously in wavy shape. Two-ended cables are vital to the bearing capacity and compressive stress increase of wall surface. Narrow rock pillar is seriously damaged by high abutment stress. Overall movements happen in wall anchorage body. The industry tests have shown that the two-ended cables can effectively help to control the stability of pillar and adjacent rock.

Key words: roadway and chamber groups, mining affection, analogy simulation tests, damage character, two-ended cables