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基于位移控制理论,采用双线开挖椭圆化非等量径向土体位移收敛模式,提出了双线地铁隧道施工诱发周围地层变形的位移控制点源解析方法以及位移控制数值模拟方法。算例结果表明,位移控制方法可以充分考虑隧道施工引起的地层损失,可以较好地预测双线平行地铁隧道开挖引起的土体变形。成果可为合理制定双线平行地铁隧道开挖对周围土工环境的保护措施提供一定的理论依据。
Based on the theory of displacement control, a displacement control point source analytical method and a numerical simulation method of displacement control are proposed based on the geostrophic non-equivalent radial soil displacement convergence model of double-line excavation. The results show that the displacement control method can fully consider the formation loss caused by the tunnel construction, and can predict the soil deformation caused by the excavation of the double-track parallel subway tunnel. The results can provide a theoretical basis for the reasonable formulation of the protective measures for the surrounding geotechnical environment in the double-track parallel subway tunnel excavation.