为解决城市地铁双护盾TBM施工在复杂岩石地层中引起的地层位移变形问题，确保施工安全并减少对周边环境的影响，针对完整岩体及破碎带岩体，采用先进的深部地层分层监测手段，结合FLAC3D数值模拟软件，对双护盾TBM施工过程中的地层位移进行实时监测和模拟分析。研究结果表明： 1）在微风化花岗岩地层中，双护盾TBM施工引起的完整岩体地层位移在-1~1 mm，属于弹性变形。2）在破碎带地层中，双护盾TBM施工引起的土层位移模式呈现为“横一区、竖一层、纵向两阶段”的特点。3）在微风化花岗岩地层中施工对完整岩体的影响较小，但在破碎带地层中需特别关注地层位移，采取有效措施进行控制。
Double-shield tunnel boring machines(TBMs) always cause ground displacement
and deformation when tunneling in complex rock strata in urban areas. To
guarantee construction safety and minimize the influence on the surrounding
environment, advanced deep geological layer monitoring methods are adopted for
intact and fractured rock masses. Based on FLAC3D numerical simulation
software, a real-time monitoring and simulation
analysis of geological displacement during construction process of the double-shield TBM are conducted. The research results indicate the
following: (1) In slightly-weathered granite
formations, the displacement of the intact rock mass caused by double-shield TBM construction is within the range of －1－1 mm, belonging to elastic deformation.
(2) In the fractured formations, the soil displacement pattern caused by double-shield TBM construction presents the characteristics of "one
zone in horizontal direction, one layer in vertical direction, and two-stage in longitudinal direction". (3) The double-shield TBM has little influence on the intact rock mass in slightly-weathered granite formations, while measures should be taken to
control ground displacement when it is applied in fractured formations.
