摘要
采用波函数展开法,推导了无限介质中双层衬砌圆形洞室在P波作用下衍射问题的解析解,并结合南水北调西线1期工程3#引水隧道开展了动应力集中系数参数敏感性分析。计算结果表明,围岩和内层衬砌的弹性模量对结构的动应力集中系数影响较大,而围岩泊松比对计算结果的影响几乎可以忽略不计;围岩和衬砌之间的介质层在一定程度上具有减震作用,前提条件是其弹性模量低于围岩弹性模量的1/20,否则减震效果不明显。
Based on wave function expansion method,an analytical solution for dynamic stress concentration of circular tunnel with double-layer-liner in infinite media under incident plane P waves is deduced.According to the solution,parameters sensitivity analysis of dynamic stress concentration is carried out in combination with the tunnel #3of the first phase project along the Western Route Project of South-to-North Water Transfer Project.The calculation results show that the elasticity modulus of surrounding rock and inner concrete liner have a greater effect on dynamic stress concentration factor;and the effect of rock Poisson＇s ratio on the factor almost can be neglected.The layer between surrounding rock and inner concrete liner exhibited role in seismic isolation under the prerequisite conditions of its elasticity modulus is less than 1/20 of one of the surrounding rock;otherwise,the effect on seismic isolation is not obvious.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第3期775-780,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.50809070
No.40872188)
"十一五"科技支撑计划课题(No.2006BAB04A06
No.2008DAB29B00)
关键词
平面P波
衍射
深埋隧道
动应力集中
plane P waves
diffraction
deep buried tunnel
dynamic stress concentration
作者简介
第一一作者简介：王长柏，1978年生，男，博士研究生，主要从事岩石动力学及地下结构工程抗震方面研究。E-mail：chbwang@126.com
