圆形巷道断面爆破地震波在围岩中传播的规律探讨
首发时间:2012-11-12
摘要:装药起爆后,其爆破地震波对围岩的作用是地下工程和结构抗震的重要研究内容。本文根据爆破地震波位移势函数的特点,采用分离变量的方法,求解得到轴坐标下的围岩质点运动规律,求出了围岩中应力随轴向距离、径向距离和时间的变化规律。把一般情况下的爆生气体压力作为边界应力条件荷载,施加于巷道围岩,求解得到了应力变化的振幅参数。结果表明:爆破地震波所导致的围岩内应力衰减极快,不同的成分分别与距离1/2,3/2,5/2次方成反比,还伴随有时间、径向距离的负指数衰减;同时,影响地震波衰减和应力变化的其他因素还有爆破空腔半径、围岩的赋存条件参数,以及由此引起的各向异性。
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Study on Propagation Law of Blasting Seismic Wave in Confining Rock near Circular Drift Section
Abstract:The effectiveness of seismic wave plays important role after the charge's initiating in confining rock. In this paper, according to the characteristic of the displacement potential function of the blasting vibration wave, by the method of separation of variables, the rule between stress and axial distance, radial distance and time has been worked out. The generally used blasting gas pressure is conducted as boundary condition, which acts upon the wall of confining rock, and the amplitude parameter of the stress has been given. The result suggests that the stress in confining rock decreases very quickly, and it is proportional to the power of minus 1/2, 3/2, 5/2 in distance, as well as declines with time and radial distance, respectively. At the same time, the factors which has hold on the stress are radius of blasting cavity, condition parameters of confining rock, and the anisotropy caused by them.
Keywords: shaft and tunnel engineering blasting vibration confining rock wave equation separation of variables
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圆形巷道断面爆破地震波在围岩中传播的规律探讨
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