CAJ | 학술논문

基于常被忽略的爆炸荷载对邻近巷道背爆侧围岩缺陷的扰动问题，采用爆炸加载数字激光动态焦散线试验系统，探究了爆炸荷载作用下邻近巷道背爆侧不同倾角裂纹缺陷的扩展规律。试验结果表明：爆炸荷载作用下，直墙拱形巷道背爆侧倾角θ=30o(逆时针方向为正)的预制裂纹最终扩展位移最大，之后随着倾角增大或者减小，裂纹扩展位移均逐渐减小；弧形断面对应力波的削弱作用小于矩形断面，这导致斜向上预制裂纹扩展位移为关于水平方向对称的斜向下裂纹的2~3倍；能量释放率对裂纹的扩展具有驱动效应，且其随时间基本呈现先振荡增加达到峰值，然后振荡减小为零的规律，但这种振荡幅度随裂纹最终扩展位移的减小而变小。上述的研究为邻近巷道背爆侧经济安全合理的支护提供了理论依据。
기우상피홀략적폭작하재대린근항도배폭측위암결함적우동문제，채용폭작가재수자격광동태초산선시험계통，탐구료폭작하재작용하린근항도배폭측불동경각렬문결함적확전규률。시험결과표명：폭작하재작용하，직장공형항도배폭측경각θ=30o(역시침방향위정)적예제렬문최종확전위이최대，지후수착경각증대혹자감소，렬문확전위이균축점감소；호형단면대응력파적삭약작용소우구형단면，저도치사향상예제렬문확전위이위관우수평방향대칭적사향하렬문적2~3배；능량석방솔대렬문적확전구유구동효응，차기수시간기본정현선진탕증가체도봉치，연후진탕감소위령적규률，단저충진탕폭도수렬문최종확전위이적감소이변소。상술적연구위린근항도배폭측경제안전합리적지호제공료이론의거。
Based on the often neglected problem of disturbance of explosive load to the defects of sur-rounding rock in adjacent tunnel back-blasting side, using explosion load digital laser dynamic caustics experimental system,the slant crack propagation regularities of neighboring roadway side are explored under explosion dynamic load. The experimental results show that crack extension final displacement is the largest, when the angle of prefabricated crack is in the side of back blasting of the straight wall and arch tunnel is 30° under the blasting load, then with the increasing or decreasing of crack angle, the ul-timate displacements of crack extension all tend to decrease gradually;attenuated effect for stress wave of arc is less than the rectangle. Consequently, oblique upward crack extension displacement is 2-3 times of oblique down crack which is symmetry with horizontal subjected to blasting loading. In addi-tion, energy release rate has driving effect on the propagation of the crack, and the energy release rate reaches the maximum in a moment and then gradually decreases to zero. But this change range becomes <br> small with the crack extension displacement decreasing. The research provides theory basis for the eco-nomic and reasonable supporting of adjacent tunnel back-blasting side.