Interaction Analysis of New Shield Tunnel Passing Through Existing Tunnel in Short Distance
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摘要: 为探究新建盾构隧道近距离侧穿既有隧道的相互影响，以武汉市轨道交通5号线盾构施工平行侧穿既有2号线区间工程为背景，使用FLAC3D软件建立了盾构隧道与既有隧道的数值模型，研究新建盾构隧道施工对既有隧道变形的影响规律，分析新建盾构隧道在列车动荷载作用下的拱顶变形特点，并结合现场监测数据进行了验证。研究结果表明：距离盾构开挖掌子面越近，既有隧道拱顶的变形速率越大，反之变形速率较平缓；既有隧道两侧水平变形呈现向隧道内凸的趋势，且靠近盾构隧道一侧的变形量远大于对侧，但两者变形量均在预警值范围内；盾构开挖时会引起既有隧道靠近盾构隧道一侧的水平变形增大，并在后续注浆步骤完成后略微减小，随后维持稳定；新建盾构隧道在既有地铁列车动荷载作用下拱顶变形量变化较小。Abstract: To study the interaction of the newly-built shield tunnel passing through the existing tunnel in a short distance, Wuhan Rail Transit Line 5 shield construction parallel to the existing line 2 was analyzed. The numerical model of shield tunnel and existing tunnel was established by FLAC3D. The influence law of the new shield tunnel construction on the existing tunnel deformation was studied, and the vault deformation characteristics of the new shield tunnel under the action of train dynamic load was analyzed and verified with the field monitoring data. The results show that: the closer to the tunnel face, the greater the deformation rate of the existing tunnel vault; the farther to the tunnel face, the deformation rate is relatively gentle. The horizontal deformation of both sides of the existing tunnel tends to protrude inward, and the deformation of one side close to the shield tunnel is far greater than that of the opposite side, but both of them are within the warning value range. The results show that the horizontal deformation of the existing tunnel near the shield tunnel increases, and decreases slightly after the completion of the subsequent grouting, and then maintains stable; the deformation of the new shield tunnel vault changes little under the action of the existing subway train dynamic load.
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Key words:
- new shield tunnel /
- existing tunnel /
- interaction /
- numerical simulation /
- train dynamic load
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表 1 土层物理力学参数表
土层名称 重度/（kN·m−3） 弹性模量/MPa 层厚/m 黏聚力c/kPa 内摩擦角/（°） 泊松比 1-1杂填土 20 46.2 2 9 19 0.4 1-2素填土 18.5 63.3 4.6 12 10 0.4 3-1粉质黏土 19.2 31 2.4 21 11 0.45 3-1b粉质黏土夹粉土、粉砂 18.4 22.5 2 12 10 0.45 3-2a黏土 20 20.5 5.3 14 6 0.45 3-2黏土 20 13.5 3.2 16 9 0.45 3-4a粉质黏土 18.8 33 4.1 23 12 0.45 3-5粉细砂、粉土、粉质黏土互层 18.9 43.5 5 6 18 0.4 4-1粉细砂 18.6 75 3.2 4 30 0.35 4-2粉细砂 18.7 105 8 4 34 0.35 20c-1强风化粉砂质泥岩 21.5 210 44.2 90 30 0.35 
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