Abstract：To explore the asymmetric deformation characteristics and structural damage patterns in tunnel intersections，this study proposes rational intersection design configurations and suitable support systems under significant squeezing-induced deformation. Taking the Yulong Snow Mountain Tunnel of the Lijiang-Shangri-La Railway as the background，the structural deformation and biased pressure characteristics of the intersection sections were investigated based on field monitoring. Then，the influence range of the intersection and the impact of rational intersection configurations on tunnel support effectiveness were analyzed through numerical simulations. The results show that the support structures in the intersection sections exhibit significant asymmetric deformation and bias pressure characteristics under the action of squeezing surrounding rock，with support failures frequently occurring at the arch shoulders and waists. When a parallel guide tunnel intersects the main tunnel at 45°and is subsequently further excavated，stress concentration is observed on both the acute and obtuse sides of the main tunnel?s support，with the acute side experiencing higher stress levels and less deformation，indicating a severe structural bias pressure. The direction of structural bias pressure on the acute side of the main tunnel is related to the distance from the intersection，with a reversal in bias pressure direction occurring between distances of 0.98D and 1.26D. Compared to 45°skewed intersections，“h-shaped”intersections prove more effective in distributing the main tunnel?s axial stress，circumferential stress，and deformation.
胡 辉，田浩晟，杨文波，董沐野，周 扬，尤著刚. 高地应力挤压性围岩隧道交叉段变形及结构力学特性研究[J]. 岩石力学与工程学报, 0, (): 862-862.
HU Hui，TIAN Haosheng，YANG Wenbo，DONG Muye，ZHOU Yang，YOU Zhugang. Study on deformation and structural mechanics characteristics of intersection section in high stress ground squeezing surrounding rock tunnels. , 0, (): 862-862.
