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圆形巷道断面爆破地震波在围岩中传播规律探讨

发表时间:2013-09-30  浏览量:1071  下载量:321
全部作者: 逄焕东,陈士海,高文乐
作者单位: 山东科技大学土木建筑学院,山东省土木工程防灾减灾重点实验室
摘 要: 根据爆破地震波位移势函数的特点,采用分离变量的方法,求解得到轴坐标下围岩质点的运动规律,以及围岩中应力随轴向距离、径向距离和时间的变化规律。将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,不同的应力部分分别与距离的1/2,3/2,5/2次方成反比,同时伴随时间、径向距离的负指数衰减;另外,影响地震波衰减和应力变化的其他因素有爆破空腔半径、围岩的赋存条件参数,以及由此引起的各向异性。
关 键 词: 井巷工程;围岩;波动方程;分离变量
Title: Exploration on the seismic wave propagation in confining rock near circular drifts section
Author: PANG Huandong, CHEN Shihai, GAO Wenle
Organization: Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, College of Civil Engineering and Architecture, Shandong University of Science and Technology
Abstract: 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 motion law of confining rock particle in axis coordinates is derived, and the rule between stress and axial distance, radial distance and time has been worked out. The general 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 internal stress in confining rock caused by blasting vibration wave decreases very quickly and different stresses are proportional to the power of minus 1/2, 3/2, 5/2 in distance respectively, as well as declines with the negative exponent of time and radial distance. At the same time, the factors which affect the stress are radius of blasting cavity, condition parameters of confining rock, and the anisotropy caused by them.
Key words: sinking and driving engineering; confining rock; wave equation; separation of variables
发表期数: 2013年9月第18期
引用格式: 逄焕东,陈士海,高文乐. 圆形巷道断面爆破地震波在围岩中传播规律探讨[J]. 中国科技论文在线精品论文,2013,6(18):1749-1753.
 
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