首页|Influence of maximum principal stress direction on the failure process and characteristics of D-shaped tunnels
Influence of maximum principal stress direction on the failure process and characteristics of D-shaped tunnels
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
To investigate the failure process and characteristics of D-shaped tunnels under different maximum principal stress directions θ,true-triaxial tests were conducted on cubic sandstone samples with a through D-shaped hole.The test results show that the failure process can be divided into 4 periods:calm,buckling deformation,gradual buckling and exfoliation of rock fragment,and formation of a V-shaped notch.With an increase in θ from 0° to 90°,the size of the rock fragments first decreases and then increases,whereas the fractal dimension of the rock fragments first increases and then decreases.Meanwhile,the failure position at the left side shifts from the sidewall to the corner and finally to the floor,whereas the failure position at the right side moves from the sidewall to the span-drel and finally to the roof,which is consistent with the failure position in underground engineering.In addition,the initial vertical failure stress first decreases and then increases.By comparing the results,the failure severities at different maximum principal stress directions can be ranked from high to low in the following order:90°＞60°＞30°＞45°＞0°.
Deep D-shaped tunnelRockburstMaximum principal stress directionTrue-triaxial testV-shaped notch
Linqi Huang、Xuefeng Si、Xibing Li、Fengqiang Gong、Yong Luo
展开 >
School of Resources and Safety Engineering,Central South University,Changsha 410083,China
School of Resources Environment and Safety Engineering,University of South China,Hengyang 421001,China
School of Civil Engineering,Southeast University,Nanjing 211189,China
万方数据
维普
