邻近隧道爆破震动对既有隧道影响的研究

运用有限元的基本理论 ,采用ANSYS软件对既有隧道受邻近隧道爆破震动影响进行了研究。分别就不同围岩类型、不同隧道间距情况下既有隧道的振动进行了分析。结果表明 :既有隧道迎爆面边墙的振速最大 ;围岩越稳固 ,振速越小 ;当间距小于 1倍的隧道直径时 ,隧道衬砌的振速会超过允许值 ;围岩的振速与至爆源距离的关系是非线性的

STUDY ON INFLUENCE OF BLASTING VIBRATION FROM EXCAVATION OF A NEW TUNNEL ON EXISTED TUNNEL

Based on the principle of finite-element method,the influence of blasting vibration from excavation of a new tunnel on close-in existed tunnel is studied by use of the ANSYS program.The vibrations of existed tunnels in different country rocks are analyzed at different spacing distances of tunnels.The results of study and analysis show that:(a)the sidewall of the existed tunnel in the face of blasting has a maximum vibration velocity;(b)the solider country rock is,the lower vibration velocity;(c)the vibration velocity of tunnel's lining will exceed the permitted vibration velocity if the spacing distance is less than one-fold of tunnel diameter;(d)the relation between vibration velocity of country rock and the distance to an explosion source is nonlinear.