【摘要】 为了解陡坡偏压小净距隧道施工对围岩的空间扰动影响,以排头隧道为工程依托,依据工程实际进行隧道施工全过程三维数值模拟,对隧道施工影响下的围岩扰动效应进行深入分析,重点考虑了中夹岩柱的位移及应力演化特征及规律,研究结果表明:由于地形偏压与施工偏压的叠加效应导致后行洞开挖初期为施工全过程中变形控制的最关键阶段,中夹岩柱受力状态控制的关键时期及重点控制区域为先行洞开挖期间先行洞的外侧拱脚区域及后行洞开挖期间先行洞外侧拱脚至墙脚及后行洞内侧拱脚至墙脚区域。更多还原

【Abstract】 In order to understand construction disturbance induced spatial effect of bias tunnels with small interval and steep slope,this paper took the Paitou tunnel as an example to carry out the whole process of three- dimensional simulation of tunnel construction based on the engineering practice and analyze the construction disturbance effect of surrounding rock. The focus was on the evolution characteristics and regularity of displacement and stress in the middle rock pillar. The results show that the early stage of following tunnel excavation is the most important period to control the deformation in the whole process of construction due to the superposition effect of terrain bias and construction bias,and that the key period of stress state control in the middle rock pillar is the stage of existing tunnel excavation. The key region is the arch foot of existing tunnel during the existing tunnel excavation and the arch foot to wall foot of existing tunnel during the following tunnel excavation and the arch foot to wall foot of following tunnel during the following tunnel excavation.更多还原