埋深对圆形洞室爆破临界破坏振速的影响研究

The Influence of Buried Depth on Critical Vibration Velocity of Circular Cavity Under the Acting of Blasting Loading

采用多极坐标和复变函数方法,利用一个半径很大的圆近似代替半空间的直边界,运用应力波理论,研究了爆破振动作用下,洞室埋深对圆形地下洞室临界振速的影响。以埋深为9 m和600 m的地下洞室为例,比较了爆破地震波作用下,不同埋深地下洞室的应力和振速分布;根据实际工程需要,求出了爆破地震波以不同角度入射,洞室埋深不同时围岩的弹性临界破坏振速。

The multi-polar coordinate, complex function and stress wave theory are employed to study the influence of buried depth on critical vibration velocity of circular cavity induced by blasting vibration, a circular cavity with large radius is used to replace the straight boundary of the half space. Taking the underground cavities with depth of 9 m and 600 m as the examples, the stress and vibration velocity distribution of underground cavities with different depth is compared under the acting of blasting seismic wave. Based on the need of practice engineering, the critical failure vibration velocity of the cavities is presented under the condition that the incident angel of stress wave and the depth of cavity are different.