ボルト支保による坑道維持効果について
坑道断面の収縮に関する基礎的研究 (第3報)
1982 年 98 巻 1128 号 p. 73-77
詳細
1982 年 98 巻 1128 号 p. 73-77
The effectiveness of rock bolting to regulate mine roadway deformation and failure condition is studied using finite element analyses and scale model tests. The results obtained in this study are as follows.
(1) The roof-side-floor bolting is the most effective support system of other bolting patterns in any strata conditions and ground pressures.
(2) The optimum bolt length is about 60% of roadway height or width. Further increases in bolt length beyond this value do not produce a proportional benefit in improving roadway conditions.
(3) The smaller the bolt spacing is, the better the roadway conditions are. It may be suggested to exsist a certain bolt spacing over which a sudden drop of the effectiveness of rock bolting occurs.
(4) The bolting in weaker rock shows higher effectiveness than in stronger one.
