基于现场变形监测成果在盾构近接既有隧道段的变形预测研究

Study on Deformation Prediction of Tunnel Adjacent to Existing Tunnel based on Field Deformation Monitoring Results

为准确掌握近接既有隧道段的变形发展规律,以苏州地铁四号线近接文灵隧道施工段为工程背景,基于其变形监测成果,先利用长短时记忆神经网络构建变形预测模型,并通过Mann-Kendall非参数检验构建其变形趋势判断模型,再通过两者分析结果的相互佐证来充分掌握近接施工段的变形发展规律。结果表明:通过近接段的现状变形特征分析,得到近接段的现状变形均处于预警范围以内,仅地表累计变形趋近于预警值,且结合变形预测结果和趋势判断结果,得到近接段的变形虽会进一步增加,但增加速率均较小,趋于稳定方向发展,得出近接文灵隧道施工段的施工过程处于可控范围,满足运营及施工安全。

In order to accurately grasp the deformation development law of the adjacent existing tunnel section,taking the construction section of Wenling tunnel of Suzhou metro line 4 as the engineering background,based on its deformation monitoring results,the deformation prediction model is constructed by using the short-term memory neural network,and its deformation trend judgment model is constructed by Mann-Kendall non-parametric inspection,and then the deformation development law of the adjacent construction section is fully grasped through the mutual evidence of the analysis results of the two.The results show that through the analysis of the current deformation characteristics of the adjacent section,it is found that the current deformation of the adjacent section is within the early warning range,and only the accumulated deformation of the surface is close to the early warning value.In combination with the deformation prediction results and trend judgment results,it is found that the deformation of the adjacent section will increase further,but the increase rate is small and tends to develop in a stable direction.It is concluded that the construction process of the adjacent Wenling tunnel construction section is in a controllable range,meet operation and construction safety.