深埋直墙拱形地下洞室爆破振动数值模拟分析

Numerical Simulation Analysis of Blasting Vibration in Deep Buried Straight Wall Arch Underground Cavern

地下水封油库的地下洞室通常采用钻爆法开挖,爆炸释放出的巨大能量会引起一系列危及工程安全的问题会影响到地下水封油库的正常使用,严重时还会造成人员伤亡和重大的经济损失。本文借助于ANSYS/LS-DYNA动力有限元分析软件来模拟爆破开挖对某地下水封石油洞库1#洞室围岩动力响应的影响,研究内容主要包括爆破开挖引起的洞室围岩质点振动速度分布情况,沿洞室轴向的传播规律。在相同时刻内地下洞室围岩质点各方向的振速呈对称性分布;X方向的最大振速出现在直立墙中部位置,而Y和Z方向最大振速出现在底板中部位置;随着爆心距R的增大,地下洞室截面上X、Y方向的峰值振速分布图形状变化较小,而Z方向的峰值振速分布图形状逐渐趋于圆形。

The underground caverns of underground sealed oil depots are usually excavated using the drilling and blasting method. The huge energy released by the explosion can cause a series of problems that endanger engineering safety and affect the normal use of underground sealed oil depots. In severe cases, it can also cause casualties and significant economic losses. This paper uses ANSYS/LS-DYNA dynamic finite element analysis software to simulate the impact of blasting excavation on the dynamic response of the surrounding rock of 1# cavern of an underground water sealed oil cavern. The research content mainly includes the distribution of particle vibration velocity of surrounding rock caused by blasting excavation, and the propagation law along the axial direction of the cavern. At the same time, the vibration velocities of the surrounding rock particles in the underground cavern exhibit a symmetrical distribution in all directions. The maximum vibration velocity in the X direction appears in the middle of the vertical wall, while the maximum vibration velocity in the Y and Z directions appears in the middle of the bottom plate. As the distance between the explosion center R increases, the shape of the peak vibration velocity distribution map in the X and Y directions on the cross-section of the underground chamber changes less, while the shape of the peak vibration velocity distribution map in the Z direction gradually tends to be circular.