隧道开挖和爆破扰动耦合作用下埋地管道安全性研究

Safety of buried pipeline under coupling effect of tunnel excavation and blasting disturbance

随着我国交通系统的快速发展,临近埋地管道施工的工程案例越来越多,隧道开挖不可避免地会影响管道的安全。为研究隧道开挖变形及爆破扰动耦合作用下临近埋地管道的安全性,以深圳市大山陂1号隧道施工为背景,建立管-土-隧动静耦合作用模型以分析不同管道内压、围岩弹模、管隧间距、单段最大装药量条件下埋地管道的应力和振速变化规律,进一步引入Morris筛选法对各因素的影响程度进行评价分析。结果表明:管道应力和管道振速受管道内压和单段最大装药量的影响最大;管道应力峰值随着管道内压的增大、围岩弹模的增大、管隧间距的减小和单段装药量的增大而增大;管道远离拉应力峰值的区域,在各种参数的综合影响下,可能出现压应力。

With rapid development of China’s transportation system,there are more and more project cases near buried pipeline construction.Tunnel excavation can inevitably affect safety of buried pipeline.Here,to study safety of adjacent buried pipeline under coupling effect of tunnel excavation deformation and blasting disturbance,a pipe-soil-tunnel dynamic-static coupled model was established to analyze variation laws of stress and vibration velocity of buried pipeline under factors of pipeline internal pressure,surrounding rock elastic modulus,pipe-tunnel spacing and single segment maximum charge.Morris screening method was further introduced to evaluate and analyze influence degree of each factor.The results showed that pipeline stress and vibration velocity are most affected by pipeline internal pressure and single segment maximum charge;the peak stress of pipeline increases with increase in internal pressure,elastic modulus of surrounding rock and single segment charge and decrease in pipe-tunnel spacing;when the pipeline is far away from the area with peak value of tensile stress,compressive stress may appear under comprehensive influence of various parameters.