近邻双线隧道施工引起土层相对位移的半解析解  

Semi-analytical Solution of Relative Displacement of Soil Layer Caused by Construction of Adjacent Double-track Tunnel

作　　者：刘大顺 杨海涛 晏莉[1] LIU Da-shun;YANG Hai-tao;YAN Li(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,China;China Construction Third Engineering Bureau(Shenzhen)Co.,Ltd.,Shenzhen 518049,China)

机构地区：[1]长沙理工大学土木工程学院,长沙410114 [2]中建三局集团(深圳)有限公司,深圳518049

出　　处：《科学技术与工程》2024年第26期11367-11376,共10页Science Technology and Engineering

基　　金：国家自然科学基金(51408067);湖南省教育厅优秀青年项目(18B136);长沙理工大学桥梁与隧道工程重点学科基金项目(10ZDXK06)。

摘　　要：近邻双线隧道施工会产生相互影响,双孔隧道的断面收敛变形与单洞收敛变形有着较大区别。结合近邻双线隧道施工洞周变形的特点,提出了一种新的位移边界条件,并通过引入位移释放系数η,分别考虑隧道开挖时和衬砌施作后洞周产生的位移,根据复变函数和交替法理论,获得了近邻双线盾构隧道开挖后的半解析解,并通过与两个现场工程监测数据对理论解进行了验证。最后对隧道进行几何参数分析,获得了不同因素影响下双线隧道施工对地层变形的扰动规律。结果表明:隧道横向变形对地表沉降曲线形态、大小均有较大影响,然而对地表沉降槽宽度影响较小;位移释放系数对地表沉降影响显著,随着位移释放系数的增加,其地表沉降越小,反之亦然;隧道埋深越大,地表沉降值越小,影响的范围越大,当超过一定深度时,地表沉降值变化相对较小;随着d/R的增加,地表沉降曲线形态从V—U—W进行演变。The construction of adjacent double-line tunnels will have mutual influence,and the section convergence deformation of double-hole tunnels is quite different from that of single-hole tunnels.A new displacement boundary condition was proposed based on the characteristics of the deformation of the adjacent double-line tunnel.By introducing the displacement release coefficient η,the displacement generated by the tunnel excavation and the lining construction was considered respectively.According to the theory of complex variable function and alternating method,the semi-analytical solution of the adjacent double-line shield tunnel after excavation was obtained.and the theoretical solution was verified by two field engineering monitoring data.Finally,the geometrical parameters of the tunnel were analysed to obtain the disturbance pattern of ground deformation under the influence of different factors in the construction of a two-lane tunnel.The results show that the lateral deformation of the tunnel has a large effect on the shape and size of the surface settlement curve,however,it has a small effect on the width of the surface settlement trough.Displacement release coefficients have a significant effect on surface settlement,which decreases as the displacement release coefficient increases and vice versa.The greater the depth of the tunnel,the smaller the surface settlement value and the larger the area of influence,and when it exceeds a certain depth,the change in the surface settlement value is relatively small.As d/R increases,the surface settlement curve shape evolves from V-U-W.

关 键 词：复变函数 SCHWARZ交替法 近邻隧道 位移边界 参数分析 

分 类 号：TU43[建筑科学—岩土工程] U45[建筑科学—土工工程]