岩土力学Issue(8)：2218-2224,7.
爆破地震波作用下既有圆形隧道衬砌动应力集中系数分析
Analysis of dynamic stress concentration factor for existing circular tunnel lining under blasting seismic wave
摘要
Abstract
The blasting seismic wave is simplified reasonably. Based on wave function expansion method, the dynamic stress concentration factor equation of tunnel surrounding rock and lining under the blasting seismic wave is deduced in infinite rock. Combining with a typical case, the influences of the main frequency of the blasting seismic wave, geometric parameters and the physico-mechanical indices of tunnel surrounding rock and lining on dynamic stress concentration factor in the different positions of tunnel are analyzed. The analytical results show that the trend of dynamic stress concentration factor of different direction stresses with the main frequency of the blasting seismic wave are different at different positions. The dynamic stress concentration factor caused by the blasting seismic wave with low main frequency of the blasting seismic wave is larger, which is unfavorable for blasting vibration resistance. The influence trend of tunnel geometric parameters on the dynamic stress concentration factor of tangential stress of tunnel surrounding rock and lining is different. The elastic modulus of tunnel lining has a greater effect on dynamic stress concentration factor than the Poisson’s ratio. The tunnel surrounding rock with larger Poisson’s ratio have the effect of blasting vibration resistance, but the effect is limited.关键词
爆破地震波/波函数展开法/隧道围岩/隧道衬砌/动应力集中系数Key words
blasting seismic wave/wave function expansion method/tunnel surrounding rock/tunnel lining/dynamic stress concentration factor (DSCF)分类
交通工程引用本文复制引用
李兴华,龙源,纪冲,周翔,何洋扬,路亮..爆破地震波作用下既有圆形隧道衬砌动应力集中系数分析[J].岩土力学,2013,(8):2218-2224,7.基金项目
国家自然科学基金资助（No.51178460，No.11102233）。 （）
