基于Pasternak剪切层理论分析隧道侧穿诱发的单桩水平位移  

Analysis of Horizontal Displacement of Single Pile Induced by Lateral Penetration of Tunnel Based on the Pasternak Shear Layer Theory

作　　者：李克金 齐跃军 汪优[3] 仇晖 张曦 吴广兴 LI Kejin;QI Yuejun;WANG You;QIU Hui;ZHANG Xi;WU Guangxing(CRCC Yellow River Investment and Construction Co.,Ltd.,Jinan 250108;China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300350;School of Civil Engineering,Central South University,Changsha 410075;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031)

机构地区：[1]中铁建黄河投资建设有限公司,济南250108 [2]中铁十八局集团有限公司,天津300350 [3]中南大学土木工程学院,长沙410075 [4]西南交通大学土木工程学院,成都610031

出　　处：《现代隧道技术》2023年第6期111-119,共9页Modern Tunnelling Technology

基　　金：国家自然科学基金(51778633);中国铁建股份有限公司2022年度科技研究开发计划及资助课题(2022-C1).

摘　　要：软土地层中隧道施工会诱发地表发生显著沉降,同时也会导致隧道附近的建筑物及其基础产生变形,而有关地铁隧道施工引发邻近建筑桩基变形的规律目前尚未完全摸清。基于Pasternak剪切层地基模型分析软土地层中隧道施工对桩基的影响机理,并建立桩的附加水平位移及附加内力的计算模型,同时提供求解方法。结果表明,在隧道侧穿单桩时模型精度良好;通过参数分析发现,隧道埋深对邻近单桩的影响主要反映在位移分布上,但对位移峰值影响不显著;弹性层厚度与水平位移及内力峰值呈负相关,但不影响其位移及内力的分布规律;对于弹性层厚度C,隧道轴线上下2 m处为弯矩恒定点,隧道轴线埋深处以及隧道轴线以上4 m处为剪力恒定点。Tunnel construction in soft soil stratum will induce noticeable surface subsidence and cause deformation of the buildings and their foundations near the tunnel.However,the deformation pattern of pile foundation of adja⁃cent building induced by subway tunnel construction is not fully understood.With the help of the Pasternak shear lay⁃er foundation model,the mechanism by which tunnel construction in soft soil stratum affects piles has been analyzed,the calculation model has been created that is used to calculate additional horizontal displacement and additional in⁃ternal force of pile and the solving method is also provided.According to the results,the model has excellent accura⁃cy in the case of lateral penetration of tunnel by single pile;According to the parameters analysis,the effect of tun⁃nel buried depth on adjacent single pile is mainly seen in displacement distribution,but it does not significantly af⁃fect the peak value of displacement.The thickness of elastic layer is in negative correlation with the peak values of horizontal displacement and internal force,but it will not affect the distribution pattern of displacement and internal force.For the thickness C of elastic layer,the bending moment is constant at 2 m above and below the tunnel axis,and the shear force is constant at 4 m above the tunnel axis.

关 键 词：Pasternak剪切层地基模型 邻近建筑桩 隧道侧穿 离散元 有限差分 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]