摘要
以天津地铁二号线盾构隧道下穿滨海国际机场停机坪工程为对象,文章运用ANSYS软件对盾构掘进过程进行了数值模拟分析,分析了不同工况下的地层位移和地表沉降。模拟结果表明:在盾构的顶进作用下,地层位移的下沉最大值出现在隧道的拱顶处,隆起最大值出现在仰拱处,地表发生前隆后沉的现象;两条隧道同时开挖引起的地表沉降量大于右线隧道开挖60 m后再开挖左线隧道所引起的沉降量;在顶进压力0.2 MPa、注浆压力0.35MPa时引起的地表沉降量约为5 mm,符合机场相关要求。根据模拟结果对盾构下穿停机坪掘进施工提出了控制措施,实测结果显示,地表沉降和隆起值在安全范围内,盾构隧道施工对停机坪的正常运营影响很小。
n this paper, based on a shield tunnel of Tianjin Metro line 2 passing beneath Binhai International Air-port, the ground displacement and surface subsidence are analyzed under different conditions by means of simulating the shield excavation process through ANSYS software. Simulation results show that under the shield-jacking effect, the maximum subsidence occurs at the crown and the maximum upheaval occurs at the invert of the tunnel, which first causes ground surface heaves and then subsides; the ground subsidence caused by simultaneous con- struction of two tunnel tubes is greater than that caused by constructing the left tube after the right tube has been ex- cavated 60 meters; in a scenario with 0.2 MPa jacking pressure and 0.35 MPa grouting pressure, the ground subsid- ence is about 5 mm, conforming to the requirements of airport operation. According to the simulation results, corre-sponding control measures for shield driving beneath an adjacent parking apron are put forward. The measured results indicate that surface subsidence and heaving are controlled within the scope of safety limits, and shield tunnel construction has little impact on normal operation of the parking apron.
出处
《现代隧道技术》
EI
CSCD
北大核心
2016年第1期180-186,共7页
Modern Tunnelling Technology
基金
陕西省教育厅科学研究项目(14JK1340)
关键词
停机坪
盾构隧道
地表沉降
数值模拟
控制措施
Parking apron
Shield tunnel
Surface subsidence
Numerical simulation
Control measures
