隧道建设
隧道建設
수도건설
TUNNEL CONSTRUCTION
2015年
6期
535-541
,共7页
基坑%地铁%位移场%管片应力%隧道%隔水帷幕%孔隙水压力%结构变形
基坑%地鐵%位移場%管片應力%隧道%隔水帷幕%孔隙水壓力%結構變形
기갱%지철%위이장%관편응력%수도%격수유막%공극수압력%결구변형
foundation pit%Metro%displacement field%segment stress%tunnel%water-insulating curtain%pore water pressure%structural deformation
随着城市地铁周边建设工程项目越来越多，研究邻近地铁的基坑施工对地铁隧道影响具有重要意义。基于苏州地铁1号线某基坑工程，采用 FLAC 3D 程序，分析研究在既有地铁隧道周边，基坑采用不同的隔水帷幕深度情况下，地下水渗流作用对地铁隧道的影响。数值模拟中考虑在2种不同的隔水帷幕深度时，基坑降水后隧道的位移场以及隧道管片应力。研究结果表明：1）增长隔水帷幕深度有利于控制隧道周围孔隙水压力降低，有利于减小隧道结构变形。2）随着隔水帷幕深度增加，减小了基坑降水引起隧道结构应力的降低。
隨著城市地鐵週邊建設工程項目越來越多，研究鄰近地鐵的基坑施工對地鐵隧道影響具有重要意義。基于囌州地鐵1號線某基坑工程，採用 FLAC 3D 程序，分析研究在既有地鐵隧道週邊，基坑採用不同的隔水帷幕深度情況下，地下水滲流作用對地鐵隧道的影響。數值模擬中攷慮在2種不同的隔水帷幕深度時，基坑降水後隧道的位移場以及隧道管片應力。研究結果錶明：1）增長隔水帷幕深度有利于控製隧道週圍孔隙水壓力降低，有利于減小隧道結構變形。2）隨著隔水帷幕深度增加，減小瞭基坑降水引起隧道結構應力的降低。
수착성시지철주변건설공정항목월래월다，연구린근지철적기갱시공대지철수도영향구유중요의의。기우소주지철1호선모기갱공정，채용 FLAC 3D 정서，분석연구재기유지철수도주변，기갱채용불동적격수유막심도정황하，지하수삼류작용대지철수도적영향。수치모의중고필재2충불동적격수유막심도시，기갱강수후수도적위이장이급수도관편응력。연구결과표명：1）증장격수유막심도유리우공제수도주위공극수압력강저，유리우감소수도결구변형。2）수착격수유막심도증가，감소료기갱강수인기수도결구응력적강저。
As more and more construction activities take place adjacent to existing Metro lines,the study on the influence of the foundation pit construction on existing Metro tunnels becomes more and more important.In this paper, the influence of the groundwater seepage on the existing Metro tunnel under different water-insulating curtain depths is studied by means of FLAC 3D software,with a foundation pit adjacent to No.1 Line of Suzhou Metro as an example.In the simulation,the displacement field of the Metro tunnel and the stress of the tunnel segments are studied under 2 different depths of the water-insulating curtains.The study results show that:1)The increase of the depth of the water-insulating curtain is helpful for the reduction of the pore water pressure around the tunnel,and in turn helpful for the control of the structural deformation of the tunnel;2)As the depth of the water-insulating curtain increases,the stress on the tunnel structure induced by the dewatering in the foundation pit reduces.
