摘要
为探讨大直径圆形顶管下穿既有高速公路对地表沉降造成的影响,以研和水厂分干线4#工作井-4#接收井顶管区间为依托,建立顶管顶进施工三维数值计算模型,并分析顶管下穿既有昆磨高速公路变形扰动变化规律。研究结果表明:顶管掘进过程中,地表横向长度方向上以“先缓后快再缓”的变化趋势达到最大沉降值1.467 mm,影响范围为4.333倍顶管直径;地表沉降理论预测值与数值计算结果吻合较好,拟合系数均超过0.99;降低顶管厚度对地表沉降的影响大于增大顶管厚度的影响,当直径从0.5D 0(D 0=3 m)增大至1.4 D 0时,地表沉降下降62.19%,影响范围下降至0.14倍;增大顶管直径和顶管弹性模量能有效控制地表沉降,当弹性模量由0.6E 0(E 0=30 MPa)增大至1.4 E 0时,地表沉降下降60.41%,影响范围下降57.89%。
The influence of large-diameter circular pipe jacking underpass construction on the existing expressways on the surface and surface settlement can be explored by establishing the three-dimensional numerical calculation model for pipe jacking and pipe penetration construction based on the pipe jacking area between No.4 working well and No.4 receiving well of the Yanhe Water Plant Branch Line,and the deformation disturbance variation law of the existing Kunming-Mengla Expressway under pipe jacking was analyzed in combination with theoretical formulas.The research results show that the maximum settlement value of 1.467 mm is reached in the lateral length direction of the surface with a changing trend of first slowing down,then accelerating,and then slowing down again during the pipe jacking tunneling process,and the influence range is 4.333 times the diameter of the pipe jacking.The theoretical predicted values of surface subsidence are in good agreement with the numerical calculation results,and the fitting coefficients are all over 0.99.The influence of reducing the thickness of pipe jacking on surface settlement is greater than that of increasing the thickness of pipe jacking,and the surface settlement decreases by 62.19%and the affected range reduces to 0.14 times when the diameter increases from 0.5 D 0 to 1.4 D 0.The increasing of the diameter and strength of pipe jacking can effectively control surface settlement,and the surface settlement and the affected area decreases by 60.41%and 57.89%respectively when the intensity increases from 0.6 E 0 to 1.4 E 0.
作者
李季
李肖
张韬
张路凯
蒋望涛
毛兆珂
LI Ji;LI Xiao;ZHANG Tao;ZHANG Lukai;JIANG Wangtao;MAO Zhaoke(China Railway First Group Fifth Engineering Co.,Ltd.,Baoji,Shaanxi 721000,China;School of Civil and Environmental Engineering,Changsha University of Science and Technology,Changsha,Hunan 410000,China;School of Civil Engineering,Yan′an University,Yan′an,Shaanxi 710006,China)
出处
《水利与建筑工程学报》
2025年第4期76-83,201,共9页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金项目(4240115)。
关键词
大直径圆形顶管
变形扰动
地表沉降
数值模型
large-diameter circular pipe jacking
deformation disturbance
surface subsidence
numerical model
