华南理工大学学报(自然科学版) ›› 2023, Vol. 51 ›› Issue (6): 62-71.doi: 10.12141/j.issn.1000-565X.220553

所属专题: 2023年交通运输工程

• 交通运输工程 • 上一篇    下一篇

基于IPSO-SVR的盾构下穿既有道路沉降预测分析

魏海斌1 魏东升1 蒋博宇1 马子鹏1 刘佳佳2   

  1. 1.吉林大学 交通学院,吉林 长春 130000
    2.中铁二十二局集团轨道工程有限公司,北京 100043
  • 收稿日期:2022-08-23 出版日期:2023-06-25 发布日期:2022-11-25
  • 通信作者: 魏海斌(1971-),男,博士,教授,主要从事道路工程研究。 E-mail:weihb@jlu.edu.cn
  • 作者简介:魏海斌(1971-),男,博士,教授,主要从事道路工程研究。
  • 基金资助:
    国家重点研发计划项目(2018YFB1600200)

Prediction Analysis of Settlement of Existing Road Under Shield Tunneling Based on IPSO-SVR

WEI Haibin1 WEI DongshengJIANG Boyu1 MA Zipeng1 LIU Jiajia2   

  1. 1.Transportation College,Jilin University,Changchun 130000,Jilin,China
    2.China Railway 22nd Bureau Group Track Engineering Co. ,Ltd. ,Beijng 100043,China
  • Received:2022-08-23 Online:2023-06-25 Published:2022-11-25
  • Contact: 魏海斌(1971-),男,博士,教授,主要从事道路工程研究。 E-mail:weihb@jlu.edu.cn
  • About author:魏海斌(1971-),男,博士,教授,主要从事道路工程研究。
  • Supported by:
    the National Key Research and Development Program of China(2018YFB1600200)

摘要:

目前,有关盾构隧道平行下穿既有道路的沉降预测研究相对较少。为准确预测在盾构过程中不同因素对既有平行道路沉降的影响规律,本研究提出一种基于改进粒子群优化的支持向量回归(IPSO-SVR)预测模型,将其应用于实际地铁隧道工程的地表道路沉降预测中。以长春地铁6号线下穿飞跃路区间工程为依托,结合盾构施工过程中盾构掘进参数、地层信息与道路沉降的监测,应用libsvm网格搜索法缩小超参数范围,同时结合非线性递减策略改进粒子群算法中惯性权重与加速因子的变化情况,最终建立IPSO-SVR预测模型,实现区间内后续路段的沉降预测。研究结果表明,对比网格搜索法与常规粒子群优化训练中目标函数(均方误差)的变化情况,经改进后的粒子群优化的收敛速度有较好提升,目标函数收敛效果更好,其最小值缩小近15%。本研究提出的IPSO-SVR对道路沉降预测平均绝对误差(MAE)为0.287,拟合决定系数R2为0.884,平均相对误差仅为8.91%,较反向传播(BP)神经网络、支持向量回归(SVR)、粒子群优化的支持向量回归(PSO-SVR)预测模型有更佳性能表现。由此可知,IPSO-SVR对于复杂情况下多因素耦合作用的非线性预测具有较高精度,其预测方法具有可行性与泛化性,可为道路沉降有效控制提供可靠依据,对保证道路正常运营与盾构施工安全有重要意义。

关键词: 盾构隧道, 沉降预测, 粒子群优化, 支持向量回归, 多因素耦合

Abstract:

At present, there are relatively few studies on the settlement prediction of shield tunnels crossing existing roads in parallel. To accurately predict the influence of different factors on the settlement of existing parallel roads in the shield process, this study proposed a support vector regression prediction model based on the improved particle swarm optimization (IPSO-SVR), which was applied to the surface road settlement prediction of actual subway tunnel engineering. Based on the Changchun Metro Line 6 under-crossing Feiyue Road section project, combined with the shield boring parameters, formation information and road settlement monitoring during the construction of the shield tunnel, this paper used the grid search method of libsvm to reduce the range of hyperparameters, and improved the change of inertia weight and acceleration factor in particle swarm optimization algorithm by combining the nonlinear decline strategy. Finally, IPSO-SVR prediction model was established to achieve the settlement prediction of subsequent sections in the interval. The results show that, comparing the changes of the objective function (mean square error) in the grid search method and in the conventional particle swarm optimization training, the convergence speed of the improved particle swarm optimization is greatly improved; the convergence effect of the objective function is better, and the minimum value is reduced by nearly 15%. The mean absolute error (MAE) of IPSO-SVR prediction of road settlement proposed in this paper is 0.287, the fitting coefficient R2 is 0.884, and the average relative error is only 8.91%, which has better performance than back propagation (BP) neural network, support vector regression (SVR) and particle swarm optimization support vector regression (PSO-SVR) prediction models. It can be seen that IPSO-SVR has high precision for nonlinear prediction of multi-factor coupling under complex conditions, and its prediction method is feasible and generalizable. IPSO-SVR can provide a reliable basis for effective control of road settlement and is of great significance for ensuring the normal operation of roads and the safety of shield construction.

Key words: shield tunnel, settlement prediction, particle swarm optimization, support vector regression, multi-factor coupling

中图分类号: