摘要
为研究盾构隧道下穿地下建筑物时的地表沉降特征和地层沉降规律,对沈阳地铁1号线某区间盾构隧道下穿地下结构引起的地层沉降进行了理论分析、数值模拟和工程监测。结果表明:盾构机从不同方向接近地下框架结构端墙的下方时,端墙下方土体出现较大的位移,因此端墙下方土体需加固;盾构机在独立基础下方掘进时,提高同步注浆压力和增加注浆量对减小地表沉降的作用不明显;地下框架结构对土层的约束作用使盾构隧道施工引起的地表最大沉降值减小,沉降槽宽度系数增大,曲线更平缓;忽略地下框架结构刚度的地表沉降数值分析结果与地表位移监测数据接近,可用于指导工程实践。
Theoretical analysis, incluing numerical simulation and engineering monitoring is con- ducted to study the characteristics of the ground deformation and the regularity of formation set- tlement, which are caused by some part of the Shenyang Metro line 1, passing through under- ground structure. When the shield approaches the end wall of underground framework from dif- ferent directions, the soil below the end wall will move, so it must be reinforced. When the drill- ing of the shield passes through the independent foundation, increasing pressure and volume of C I grouting an t reduce the amount of surface subsidence. Because the constraint of underground frame structure, the tunnel construction causes the increasing of width coefficient of the ground settlement tank, the decreasing of maximal settlement becomes gentler. The results of numerical simulation was close to the monitoring data when the stiffness of under-ground frame structure is ignored, and it can provide a guidance for the engineering practice.
出处
《防灾减灾工程学报》
CSCD
北大核心
2013年第6期705-711,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
湖南省自然科学基金项目(11JJ4031)
湖南省教育厅重点研究项目(09A016)
湖南省教育厅一般研究项目(11C0246)
中南大学博士后基金项目(QT1213)资助
关键词
隧道工程
地下空间
数值模拟
盾构隧道
地表沉降
tunnel engineering
underground space
numerical simulation
shield tunnel
surface subsidence
