摘要
隧道在爆破开挖过程中产生的爆炸冲击波会对地表产生一定的影响,为了研究地表的震动规律及其对地面房屋的影响,依托辽宁省丹东市郊附近的爱民山隧道,利用ANSYS有限元分析软件建立三维立体模型,采用合理的单元类型,分别赋予不同地层材料属性,在掌子面和隧道壁上施加爆破荷载,经过动力计算,得到地表一些特殊点的震速波形图。经过有限元分析计算表明:隧道上方地表的最大震速为32.3 mm/s,小于规定数值,所以地面建筑物是安全的;由于纵波在固体介质中的传播速度快于横波的传播速度,X方向的震速峰值较Y方向出现滞后性,滞后约100 ms;由于空洞效应的存在,导致处于隧道已开挖区的地表震动速度大于未开挖区的地表震动速度,在距离爆源15 m~30 m处空洞放大效应最为明显。
The explosive shock wave produced in the process of blasting excavation of tunnels will have a certain impact on the ground surface. In order to study the law of ground vibration and its effect on ground buildings, based on the Aiminshan Tunnel near Dandong City, Liaoning Province, this paper uses ANSYS finite element analysis software to build three-dimensional model, uses reasonable element types and assign different stratum material properties. We applied blasting loads on the face of the tunnel and obtained the velocity waveforms of some special points on the surface by dynamic calculation. The results of finite element analysis and calculation show that: the maximum seismic velocity of the ground above the tunnel is 32.3 mm/s, which is less than the prescribed value, so the ground buildings are safe;because the propagation speed of P-wave in solid medium is faster than that of S-wave, the peak value of seismic velocity in X direction lags behind that in Y direction, which lags about 100 ms;because of the cavity effect, the ground vibration velocity in the excavated area of the tunnel is greater than that in the untapped area, and the cavity amplification effect is most obvious at the distance of 15 m~30 m from the explosion source.
作者
杨开江
Yang Kaijiang(Liaojiheimeng Headquarters of China Railway 15th Bureau Group Corporation Limited,Changchun 130123,China)
出处
《山西建筑》
2022年第13期159-162,共4页
Shanxi Architecture
关键词
爆破震动
数值模拟
震动速度
空洞效应
blasting vibration
numerical simulation
vibration velocity
cavity effect
作者简介
杨开江(1982-),男,工程师,从事土木施工及研究。
