CAJ | 학술논문

深圳地铁四号线K9＋125～＋255段为富水流沙地层,岩体破碎自稳能力差,且洞身穿越立交桥群,多条管线穿在隧道上方,隧道围岩变形控制要求极高,施工风险大。采用现场监控和数值模拟,对CRD法开挖进行了动态分析。研究结果表明：尽早施做临时支撑对抑制未闭合结构早期的沉降起着重要的作用,拆除临时支撑时,结构的最大位移增大约40%;各部开挖引起拱顶下沉量具有良好的分布规律,可用于对最终拱顶下沉量的预报;施工中应重点监测和控制开挖CRD1的拱顶下沉量。
심수지철사호선K9＋125～＋255단위부수류사지층,암체파쇄자은능력차,차동신천월입교교군,다조관선천재수도상방,수도위암변형공제요구겁고,시공풍험대。채용현장감공화수치모의,대CRD법개알진행료동태분석。연구결과표명：진조시주림시지탱대억제미폐합결구조기적침강기착중요적작용,탁제림시지탱시,결구적최대위이증대약40%;각부개알인기공정하침량구유량호적분포규률,가용우대최종공정하침량적예보;시공중응중점감측화공제개알CRD1적공정하침량。
Subway tunnel between mileages K9＋125 and K9＋255 on Shenzhen Subway Line 4 is embedded in water-soaked quick-sand stratum.The rock mass has little stand-up time and the tunnel passes the flyover bridges with many pipelines passed over it.Tunnel construction faced a big risk and surrounding rock deformation must be minimized.Based on the field monitoring data incorporating numerical analysis,the CRD method excavation is analyzed dynamically.The research indicates that temporary supports constructed as soon as possible can inhibit the early settlement of unclosed structure meanwhile the maximum displacement of the structure by about 40 % when they are dismantled.The arch crown subsidence caused by each heading excavation is distributed well,which could be used as an indicator to forecast;and the supervision of arch crown subsidence should be focused on heading CRD1 which was excavated firstly.