爆破振动对陡倾层状岩体隧道稳定性影响
发布时间：2018-10-14 20:52
【摘要】：钻爆法是隧道掘进的一种主要施工方法,在爆破振动作用下,围岩及支护结构的稳定性将受到影响。隧道围岩稳定性是施工中最重要的安全问题,所以,隧道爆破掘进时,必须弄清楚隧道围岩和支护结构对爆破振动的动力响应,从而将爆破产生的影响控制在允许范围之内。本文针对陡倾层状岩体的特点,以杭瑞高速公路贵州境内青山隧道为研究背景,通过现场监测,在研究爆破振动衰减规律的基础上,采用数值模拟方法,系统的研究了爆破振动作用下,围岩和支护结构的振速、应力和位移的动态响应规律。取得的主要研究成果如下:1.现场监测,得到青山隧道不同爆源距拱脚处的爆破振动速度,采用M.A萨道夫斯基公式回归分析建立爆破振动沿隧道拱脚处的传播衰减规律公式,通过公式预测安全振速下单段最大装药量,并通过对其他两个不同地质条件和爆破方案的隧道进行爆破振动监测,从而提出合理的振动控制措施。2.采用ADINA有限元软件,建立与现场监测相同段的隧道三维数值模型,考虑岩层结构面的影响,研究爆炸地震波在青山隧道III类围岩中的传播衰减规律,同时分析了爆破过程中围岩和支护结构应力场和位移场的变化规律。3.分析爆破振动诱发陡倾层状围岩隧道失稳机理,并针对陡倾层状围岩几种常见的失稳形式进行分析,对围岩失稳的临界振速进行预测。
[Abstract]:Drilling and blasting method is one of the main construction methods for tunneling. Under the action of blasting vibration, the stability of surrounding rock and supporting structure will be affected. The stability of tunnel surrounding rock is the most important safety problem in construction. Therefore, the dynamic response of tunnel surrounding rock and supporting structure to blasting vibration must be made clear when tunneling by blasting, so that the influence of blasting is controlled within the allowable range. In view of the characteristics of steeply inclined layered rock mass, taking Qingshan Tunnel in Hangrui Expressway as the research background, based on the field monitoring, and on the basis of studying the attenuation law of blasting vibration, the numerical simulation method is adopted in this paper. The dynamic response law of vibration velocity, stress and displacement of surrounding rock and supporting structure under blasting vibration is studied systematically. The main research results are as follows: 1. On site monitoring, the blasting vibration velocity at different blasting source distance from arch foot in Qingshan tunnel is obtained. The propagation and attenuation law formula of blasting vibration along the arch foot of tunnel is established by means of M.A. Sadolski formula regression analysis. The maximum charge quantity of the order section of the safe vibration velocity is predicted by the formula, and the blasting vibration monitoring of the other two tunnels with different geological conditions and blasting schemes is carried out, and the reasonable vibration control measures are put forward. 2. Using ADINA finite element software, the three-dimensional numerical model of tunnel in the same section as field monitoring is established. Considering the influence of rock structure plane, the propagation and attenuation law of explosion seismic wave in III surrounding rock of Qingshan tunnel is studied. At the same time, the variation law of stress field and displacement field of surrounding rock and supporting structure during blasting are analyzed. The mechanism of tunnel instability induced by blasting vibration is analyzed and the critical vibration velocity of rock mass instability is predicted according to several common instability forms of steep inclined layered surrounding rock.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
本文编号：2271606
[Abstract]:Drilling and blasting method is one of the main construction methods for tunneling. Under the action of blasting vibration, the stability of surrounding rock and supporting structure will be affected. The stability of tunnel surrounding rock is the most important safety problem in construction. Therefore, the dynamic response of tunnel surrounding rock and supporting structure to blasting vibration must be made clear when tunneling by blasting, so that the influence of blasting is controlled within the allowable range. In view of the characteristics of steeply inclined layered rock mass, taking Qingshan Tunnel in Hangrui Expressway as the research background, based on the field monitoring, and on the basis of studying the attenuation law of blasting vibration, the numerical simulation method is adopted in this paper. The dynamic response law of vibration velocity, stress and displacement of surrounding rock and supporting structure under blasting vibration is studied systematically. The main research results are as follows: 1. On site monitoring, the blasting vibration velocity at different blasting source distance from arch foot in Qingshan tunnel is obtained. The propagation and attenuation law formula of blasting vibration along the arch foot of tunnel is established by means of M.A. Sadolski formula regression analysis. The maximum charge quantity of the order section of the safe vibration velocity is predicted by the formula, and the blasting vibration monitoring of the other two tunnels with different geological conditions and blasting schemes is carried out, and the reasonable vibration control measures are put forward. 2. Using ADINA finite element software, the three-dimensional numerical model of tunnel in the same section as field monitoring is established. Considering the influence of rock structure plane, the propagation and attenuation law of explosion seismic wave in III surrounding rock of Qingshan tunnel is studied. At the same time, the variation law of stress field and displacement field of surrounding rock and supporting structure during blasting are analyzed. The mechanism of tunnel instability induced by blasting vibration is analyzed and the critical vibration velocity of rock mass instability is predicted according to several common instability forms of steep inclined layered surrounding rock.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
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