摘要
Abstract
In deep buried environments,the stress in the engineering area is often dominated by tectonic stress,and the stress transfer path of the surrounding rock after tunnel excavation is more complex.This article takes a deep buried water diversion tunnel as an example,and uses the finite element software MIDAS to simulate the entire process of tunnel excavation and support through a three-dimensional numerical model of the component engineering area,in order to explore the disturbance characteristics of water diversion tunnel excavation in deep buried environments.The results show that after unloading during tunnel excavation,the stress distribution of the surrounding rock is redistributed,and the maximum vertical displacement of the surrounding rock occurs at the inverted arch,with a value of 3.931 mm,manifested as uplift deformation.The maximum settlement occurs at the arch top,with a value of 3.866 mm.In comparison,the horizontal deformation of the surrounding rock is relatively small.The initial support structure exhibits a characteristic pattern of overall compression,with the maximum compression occurring at the side wall position at a value of 3 163 kN and the minimum compression occurring at the arch top position at a value of 102 kN;The maximum bending moment is about 27 kN·m,located at the side wall position,manifested as outer bending,and the minimum bending moment is about 7 kN·m,located at the inverted arch position,manifested as inner bending.After the construction of the secondary lining,the maximum tensile strength of the secondary lining is located at the inverted arch of the tunnel,with a value of 0.342 MPa,and the maximum compressive strength is located at the arch waist,with a value of 3.421 MPa,both of which are lower than the structural bearing capacity limit and ensure structural safety.关键词
深埋/引水隧洞/TBM/开挖扰动特性Key words
Deep burial/Water diversion tunnel/TBM/Excavation disturbance characteristics分类
建筑与水利
