水资源与水工程学报2024，Vol.35Issue(3)：173-182,191,11.DOI:10.11705/j.issn.1672-643X.2024.03.20
渗流-应力耦合作用下穿断层破碎带TBM输水隧洞结构安全研究
Structural safety of TBM water conveyance tunnels passing through fault fracture zones under seepage-stress coupling action
摘要
Abstract
In order to analyze the stability of surrounding rock and the safety of supporting structure of deep-buried long water conveyance tunnels passing through fault fracture zones under open tunnel boring machine(TBM)construction,a three-dimensional dynamic construction simulation model of seepage-stress coupling for the north line of Dongzhuang Water Conservancy Hub during excavation was estab-lished by ABAQUS.The stability of the surrounding rock at the fault fracture zone during tunnel excava-tion and support construction was studied,and the mechanical characteristics of the support structure and its changing rules were investigated.The results showed that the maximum porosity of the surrounding rock around the tunnel increased by 0.88%compared to its initial state due to unloading effects,while the maximum permeability coefficient increased by 2.59%compared to its initial state.The pore water pressure of the surrounding rock decreased with the construction process of the excavation and support,then leveled off,and finally rose back until it stabilized.The plastic zone of the surrounding rock ap-peared in the radial range of 1 m,and the extreme value of the equivalent plastic strain was present at the waistline of the surrounding rock.The anchor stress reached its peak value as soon as the lining was sup-ported,and its maximum value was 182.90 MPa.Both the inner and outer edges of the lining were under pressure,and the circumferential stress value of the lining first reached a maximum value,and then slightly decreased until it stabilized with the construction process of the excavation and support,which fell in the range of 6.66-11.92 MPa.The deformation of the lining as a whole showed an inward contrac-tion,and its deformation decreased gradually from the top and bottom arches to the waistline,and its val-ue was in the range of 0.67-1.35 mm.With the increase of the drainage,the maximum radial shrink-age value of the surrounding rock gradually increased,but the reduction factor of water pressure outside the lining gradually decreased.The results of the study can provide a reference basis for the preliminary structural design,safe construction and operation of TBM tunnels passing through fault fracture zones.关键词
输水隧洞/断层破碎带/渗流-应力耦合/隧道掘进机(TBM)/支护结构/施工仿真Key words
water conveyance tunnel/fault fracture zone/seepage-stress coupling/tunnel boring ma-chine(TBM)/support structure/construction simulation分类
建筑与水利引用本文复制引用
康凯,张飞儒,王正中,许建建,刘彪,赵玮,刘铨鸿,王鑫..渗流-应力耦合作用下穿断层破碎带TBM输水隧洞结构安全研究[J].水资源与水工程学报,2024,35(3):173-182,191,11.基金项目
陕西省水利电力勘测设计研究院面向高校科研专项基金项目(SXY-KYJJ-002) （SXY-KYJJ-002）
