爆破地震波作用下隧道围岩动应力集中系数分析  

Dynamic stress concentration factor for tunnel surrounding rock under blasting seismic waves

作　　者：李兴华[1] 龙源[1] 纪冲[1] 周翔[1] 路亮[1] 

机构地区：[1]解放军理工大学野战工程学院,江苏南京210007

出　　处：《岩土工程学报》2013年第3期578-582,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51178460;11102233)

摘　　要：将爆破地震波进行合理近似简化,采用波函数展开法,推导了无限岩石介质中爆破地震波作用下隧道围岩动应力集中系数的表达式,结合具体算例,从理论上定量分析了围岩不同位置上爆破地震波主频和围岩物理力学指标对动应力集中系数的影响。分析结果表明:隧道围岩迎爆侧的动应力集中系数整体上大于背爆侧,动应力集中系数峰值偏向于迎爆侧;在不同主频爆破地震波作用下,动应力集中系数的影响存在最大值;隧道围岩的弹性模量对动应力集中系数的影响较大,而泊松比对动应力集中系数的影响较小。The blasting seismic waves are simplified reasonably. Based on the wave function expansion method, an equation for dynamic stress concentration factor of tunnel surrounding rock of infinite rock under the blasting seismic waves is deduced. Based on a typical case, the influences of the main frequency of the blasting seismic wave and the physico-mechanical indices of tunnel surrounding rock on the dynamic stress concentration factor at different positions are quantitatively analyzed. The results show that the dynamic stress concentration factor of tunnel surrounding rock near blasting is larger than that far away from it. The peak of dynamic stress concentration factor of tunnel surrounding rock is close to the near-blasting side. There is a peak of the dynamic stress concentration factor under different main frequencies of the blasting seismic waves. The elasticity modulus of the surrounding rock has a greater effect on the dynamic stress concentration factor, and the effect of Poisson＇s ratio of rock on the factor can almost be neglected.

关 键 词：爆破地震波 波函数展开法 隧道围岩 动应力集中系数 

分 类 号：U451[建筑科学—桥梁与隧道工程]