摘要
在偏压情况下对不同埋深的4车道和2车道偏压公路隧道建立其力学模型,研究其松动围岩力学特征。在考虑应力剪胀对隧道围岩的影响后,计算出洞周围岩位移、收敛比。研究结果表明:对于相同的条件,4车道偏压公路隧道的围岩剪切破坏带比2车道更容易与地面贯通;随着剪胀角的递增,围岩位移矢量和隧道拱顶下沉量逐渐减小,拱脚水平位移逐渐增大;大跨度隧道围岩位移受剪胀角的影响比小断面隧道显著。
Mechanical models have been established for four-lane and two-lane highway bias tunnels with different cover depths by using finite differential code. The mechanical behavior of loose rock masses is studied. The displacement and convergence ratio of surrounding rock are analyzed when the impact of shear dilation to the stability of surrounding rock is considered. From the numerical results,for the same conditions of dilation angle,rock property and cover depth,some conclusions are drawn that the shear fracture band of four-lane highway tunnel tends to be expanded to the ground than that of two-lane highway tunnel,that the displacement vector and crown settlement decreases with the increase in dilation angle,but the horizontal displacement of abutment increases,and that the influence of dilation angle on the large span tunnel is greater than that of small span tunnel.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期501-504,共4页
Rock and Soil Mechanics
基金
交通部西部建设科技项目资助(No.200631878557)。
关键词
剪胀
偏压隧道
松动围岩
4车道隧道
dilation
bias tunnel
loose rock mass
four-lane tunnel
