盾构掘进中地层损失引起地层变形的三维解析参数确定
李新龙1,2周凯1王亚磊1赵佳乐2刘洋2
Determination of 3D Analytical Parameters for Ground Deformation Induced by Stratum Loss during Shield Tunneling
LI Xinlong1,2ZHOU Kai1WANG Yalei1ZHAO Jiale2LIU Yang2
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作者信息:1.中铁十五局集团地下工程有限公司, 225101, 扬州
2.北京科技大学未来城市学院, 100083， 北京李新龙=1,2
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Affiliation:1.China Railway 15th Bureau Group Underground Engineering Co., Ltd., 225101, Yangzhou, China
2.School of Future Cities, University of Science and Technology Beijing, 100083, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20231246
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中图分类号/CLCN:U456.3+1
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栏目/Col:土建工程
摘要:
［目的］盾构掘进将不可避免地诱发地层损失，进而引起地层变形，现有的解析解均以待定参数作为输入量，其参数确定的复杂性限制了解析解的应用，因此有必要建立地层损失与解析解待定参数的关系，简化解析解的应用过程。［方法］在Verruijt和Sagaseta隧道开挖引起地层变形解析解的基础上，结合地层损失和相对变形的概念，采用积分公式推导了解析解中所需待定参数与地层损失之间的关系；并在平面应变问题的假设条件下，得到了待定参数沿盾构掘进方向的变化公式，从而将解析解推广至了三维空间；进一步结合实际工程分析了盾构掘进时地层损失引起的地层变形规律，并与现场实测值进行对比，从而验证该方法的可靠性。［结果及结论］该方法得到的地层三维变形解析结果与工程经验相符，可以很好地反映地层变形分布规律，且与实测数据具有较好的拟合效果；采用该方法，结合Verruijt复变函数解和Sagaseta镜像解，可以得到的盾构掘进时地层中任意一点由于地层损失引起的三维变形，进而实现盾构掘进引起地层变形的预测。
Abstracts:
［Objective］ Shield tunneling inevitably induce stratum loss, subsequently causing ground deformation. Existing analytical solutions use undetermined parameters as inputs, but the complexity of parameter determination limits the application of analytical solutions. Therefore, it is necessary to establish the relationship between the stratum loss and the undetermined parameters in analytical solutions to simplify the application process. ［Method］ Based on the analytical solutions for ground deformation induced by tunnel excavation proposed by Verruijt and Sagaseta, the relationship between the undetermined parameters required in the analytical solution and ground loss is derived using integral formulas, by incorporating the concepts of stratum loss and relative deformation. Under the assumption of plane strain problems, the variation formula of the undetermined parameters along the shield tunneling direction is obtained, thereby extending the analytical solutions to 3D space. Furthermore, the ground deformation law induced by ground loss during shield tunneling is analyzed through practical engineering cases, and compared with field-measured values to verify the reliability of the method. ［Result & Conclusion］ The 3D deformation results obtained by this method align with engineering experience, effectively reflecting the distribution law of ground deformation and demonstrating good fitting outcome with field-measured data. Using this method, combined with Verruijt's complex variable solution and Sagaseta's mirror image solution, the 3D deformation at any point in the ground due to the ground loss during shield tunneling can be determined, thereby enabling the prediction of ground deformation induced by shield tunneling.
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