水文地质工程地质2012，Vol.39Issue(3)：38-44,7.
隧道掘进面接近地质界面时围岩的应力特征研究
A study of the stress of surrounding rock when tunnel excavation approaches the geological interface
摘要
Abstract
Geological variability, such as irregular distribution of soft and hard ground, often obviously occurs in tunnel excavation grounds. As a result, the stress behavior of the tunnel after excavation will be very complex. The stress of surrounding rock is analyzed with FLAC30 when tunnel excavation aproaches the geological interface. The influencing factors such as in-situ stress, cavern shape are also studied in this paper. The calculation results show that there will be stress concentration in surrounding rock ahead the excavating face when excavation is from hard rock to soft rock or from soft rock to hard rock. The radial stress of surrounding rock of side wall ahead the excavating face will increase with increasing lateral stress, and the longitudinal stress of surrounding rock of the crown and side wall ahead the excavating face will increase with increasing longitudinal stress. The stress of surrounding rock of side wall of hoof-like tunnel behind the excavating face is smaller than that of circular tunnel.关键词
隧道/地质界面/侧应力系数/洞室形状/应力Key words
tunnel/ geological interface/ lateral pressure coefficient/ cavern shape/ stress分类
建筑与水利引用本文复制引用
熊良宵,袁学武..隧道掘进面接近地质界面时围岩的应力特征研究[J].水文地质工程地质,2012,39(3):38-44,7.基金项目
国家自然科学青年基金项目(41002108) （41002108）
岩土钻掘与防护教育部工程研究中心开放研究基金课题(201104) （201104）
地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2011K008) （SKLGP2011K008）
宁波市自然基金项目(2011A610072) （2011A610072）
浙江省重中之重学科项目(ZJ1008) （ZJ1008）
