钻地武器作用下坑道动被复结构荷载的计算

Load calculation of dynamic load lining under penetration weapon

为研究坑道动被复结构在钻地武器作用下的荷载变化情况,通过震塌荷载经验公式的计算对比,给出4级围岩在典型钻地武器GBU-28作用下的荷载变化规律。计算结果表明,震塌荷载的变化同坑道动被复段的围岩级别和支护类型有关,支护条件一定时,围岩质量越好其震塌荷载就越小;围岩级别相同时,支护条件越好其震塌荷载就越小。Ⅳ级围岩在24 m左右时,不论采用什么支护形式,其震塌荷载都较大,因此Ⅳ级围岩不适宜构筑坑道工程的口部结构,在设计中应予以避免。

In order to study load changes of the dynamic load lining under the penetration weapon-GBU28, the load changes of four kinds of enclosing rocks were calculated and compared through empirical formula. The result indicates that the load is related to the quality of the rock mass and the supporting method of the dynamic load lining; while in the same condition of support, the peeling-off arching load gets lower as the quality of the surrounding rock improves; while in the same surrounding rock, the peeling-off arching load gets lower as the supporting method improves. As the thickness of the fourth enclosing rock is about 24 meters, the peeling-off arching load is high whatever supporting method is adopted. Therefore, the main entrance of the tunnel engineering should not be constructed in the fourth enclosing rock.