工程地质学报2023，Vol.31Issue(6)：2008-2019,12.DOI:10.13544/j.cnki.jeg.2021-0537
非均质断层破碎带盾构开挖面极限支护力上限解
UPPER BOUND SOLUTION OF SHIELD TUNNEL FACE SUPPORTING PRESSURE IN NON-HOMOGENEOUS FAULT FRACTURE ZONE
摘要
Abstract
The shield construction through fault fracture zone is universal,and the existing non-homogeneous mod-el cannot fully respond to the inclination and non-homogeneity of the fault fracture zone.To address this problem,we proposed a spatial non-homogeneous distribution function model.We described the inclination,non-homogene-ous and non-homogeneous coefficient size of the fault fragmentation zone by introducing the non-homogeneous direc-tion angle and non-homogeneous coefficient angle,respectively.Then,the model was applied to the limit analysis upper bound method.We derived the calculation formula of the ultimate supporting pressure at the excavation sur-face of shield tunneling through fault fracture zone.We also verified the rationality of the spatial non-homogeneous distribution function model by calculation examples and engineering examples.Finally,we analyzed the effects of internal friction angle,cohesion,burial depth ratio,and non-homogeneous coefficient on the stability of the excava-tion surface under different non-homogeneous directions.The results show the follows.The change of the non-homo-geneous direction angle has a great influence on the supporting pressure and failure mode of the tunnel excavation surface.The supporting pressure of excavation face decreases with the increase of non-homogeneous direction angle,internal friction angle,cohesion,burial depth ratio and non-homogeneous coefficient.The increase of non-homoge-neous directional angle and internal friction angle makes the collapsing body in front of the excavation face change from the trend of sliding downward from the vault to sliding downward from the front.The reinforcement focus should be different for the fault fragmentation zone with different non-homogeneous directional angle and internal friction angle.关键词
盾构隧道/支护压力/上限法/断层破碎带/非均质Key words
Shield tunnel/Supporting pressure/Upper bound method/Fault fracture zone/Non-homogeneous分类
交通工程引用本文复制引用
廖伯富,黄明,路遥,黄永杰,许佳佳..非均质断层破碎带盾构开挖面极限支护力上限解[J].工程地质学报,2023,31(6):2008-2019,12.基金项目
国家自然科学基金(资助号:41972276),福建省杰出青年科学基金项目(资助号:2020J06013).This research is supported by the National Natural Science Foundation of China(Grant No.41972276)and Natural Science Foundation of Fujian Province(Grant No.2020J06013). （资助号:41972276）
