摘要
依托新疆YEGS二期输水KS隧道工程,针对TBM隧道围岩及初期支护结构开展现场监测试验研究,分析隧道深部围岩位移及支护结构受力特性,研究结果表明,隧道围岩深部位移较小,越靠近隧道轮廓边缘内部位移越大,越向围岩深处内部位移越小;围岩接触应力均为正值,初期支护整体表现为受压状态.围岩接触应力受支护结构本身抵抗变形能力的影响较大;钢拱架呈现受压状态,相同测点位置处外侧应力普遍小于内侧应力;自锚杆近端沿轴线方向锚杆轴力逐渐增大,在中性点附近达到峰值,往锚杆远端处轴力逐渐减小.整体表现为拱顶处锚杆轴力最大,拱肩处次之,拱腰处最小,即:拱顶>拱肩>拱腰.
Relying on the YEGS second-phase water delivery KS tunnel project in Xinjiang,the field monitoring test was carried out for the surrounding rock and initial supporting structure of the TBM tunnel. The displacement of the surrounding rock in the deep tunnel and the mechanical characteristics of the supporting structure were analyzed.The research results show that the displacement in the deep part of the surrounding rock of the tunnel is smaller. The closer to the edge of the tunnel contour,the larger the internal displacement. The deeper the surrounding rock,the smaller the internal displacement. The contact stresses of the surrounding rock are all positive values,and the initial support is in compression state as a whole. The contact stress of the surrounding rock is greatly affected by the ability of the supporting structure to resist deformation. The steel arch frame is in compression state as a whole,and the internal stress at the same measuring point is generally greater than the external stress. The axial force of the anchor rod increases gradually from the proximal end of the anchor rod along the axis direction,reaches the peak value near the neutral point,and gradually decreases toward the distal end of the anchor rod. The overall performance is that the axial force of the anchor rod is the largest at the vault,followed by the spandrel,and the smallest at the arch waist,that is,vault>arch shoulder>arch waist.
作者
赵向波
王利明
王军
赵海雷
ZHAO Xiangbo;WANG Liming;WANG Jun;ZHAO Hailei(Xinjiang Irtysh River Basin Development and Construction Management Bureau,Urumqi 830000,China;State Key Laboratory of Shield Machine and Boring Technology,Zhengzhou 450001,China;China Railway Tunnel Bureau Group Co.Ltd.,Guangzhou 511458,China)
出处
《河南科学》
2022年第1期54-58,共5页
Henan Science
基金
国家重点研发计划(2020YFB2006803)
河南省科技攻关项目(212102310270)
新疆额尔齐斯河流域开发工程建设管理局科研课题(EQ076/FY057)
中国中铁股份有限公司科技研究开发计划(2019-重大-10)
中铁隧道局集团科技创新计划(隧研合2019-10)。
关键词
TBM
现场监测
深部位移
初期支护
力学性能
TBM
field monitoring
deep displacement
initial support
mechanical property
