摘要
TBM的开挖效果在很大程度上受到节理间距的影响,TBM掘进速度随节理间距变小而增大,但节理间距过小,会造成掌子面岩体不稳,不利于TBM开挖。锦屏II级水电站引水隧洞洞段主要以层状大理岩为主,沿洞轴线方向大理岩层层厚变化较大,从几厘米到几米不等,层面是岩体中主要的不连续面,且层面与隧道轴线大角度相交。TBM的破岩过程主要受到高地应力条件和岩体层厚的影响。从TBM破岩机制角度,分析在高地应力条件下TBM在薄层面、中薄层面和厚层面大理岩层状岩体中的开挖表现,研究岩层厚度对TBM开挖的影响。
The tunnel boring machine（TBM） performance is influenced by the joint spacing in a large extent.TBM penetration rate increases with decreasing joint spacing.But,too small joint spacing makes the tunnel face in stable that is not favorable to TBM excavation.The rock masses along the headrace tunnel of Jinping II hydropower station are composed of marble with different thicknesses of the layers.The thickness varies largely along the tunnel alignment from several centimeters to several meters.The layer surface is the main non-continuous face in these rock masses and the intersection angle between the tunnel axis and the layer is from 60°to 80°.The rock breakage process in the tunnel is influenced by the high in-situ stress and the layer thickness.TBM performance is analyzed in thin layer,thin to middle layers and thick layer marble rock masses under the high in-situ stress from the point view of rock breakage mechanism by TBM,respectively.The influence of the layer thickness on TBM penetration is studied.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第7期1442-1449,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50878009)
关键词
隧道工程
节理间距
高地应力
层厚
大理岩
tunnelling engineering
joint spacing
high in-situ stress
layer thickness
marble
