河南城建学院学报2023，Vol.32Issue(6)：1-8,8.DOI:10.14140/j.cnki.hncjxb.2023.06.001
浅埋偏压小净距隧道施工扰动空间效应研究
Spatial mechanical effect of disturbance in shallow tunnel construction with bias pressure and small clearance distance
摘要
Abstract
In order to understand the disturbance effect of shallow-buried bias voltage and small clearance dis-tance tunnel construction on tunnel surrounding rock,taking the Yidong High-speed Defense Army Tunnel as the engineering background,a three-dimensional model of the tunnel entrance small clearance distance section is established based on the finite element software MIDAS GTS NX,and its spatial effect is analyzed.The dy-namic construction process of the tunnel entrance section is simulated using the reserved core soil method,and the displacement field and stress field evolution characteristics and laws of the tunnel surrounding rock are studied.The research results show that after tunnel excavation,the ground settlement shows obvious asymme-try,and the pre-excavation of the leading and trailing tunnels has a greater impact on the ground settlement dis-placement.The spatial constraint range of the tunnel excavation face is 1～1.5 times the tunnel diameter in front and behind the excavation face,and the range of 0.5 times the tunnel diameter in front and behind the excavation face is the strong influence zone,while the range of 0.5～1 times the tunnel diameter is the weak influence zone.The influence of the trailing tunnel excavation on the main stress bias ratio of the surrounding rock is relatively small,but the position of the arch foot is greatly affected by the bias after the trailing tunnel excavation.The support structure should be closed in a timely manner during tunnel construction,and the stress concentration position should be monitored.关键词
空间效应/小净距隧道/浅埋偏压/施工扰动Key words
spatial effect/small clearance tunnel/shallow buried bias pressure/construction disturbance分类
交通工程引用本文复制引用
毕志刚,李旭哲,王凯,郑凯,梁斌..浅埋偏压小净距隧道施工扰动空间效应研究[J].河南城建学院学报,2023,32(6):1-8,8.基金项目
国家自然科学基金(U1604135) （U1604135）
中铁十五局集团有限公司重点科研项目(2021C1) （2021C1）
河南省科技厅产学研合作项目(2015HNCXY011) （2015HNCXY011）
