荷载变化对高铁水下盾构隧道力学响应的影响  

Study on the Influence of Loading Variation on the Mechanical Responses for an Underwater High-speed Railway Shield Tunnel

作　　者：王帅 WANG Shuai(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道勘察》2025年第2期143-150,共8页Railway Investigation and Surveying

基　　金：国家自然科学基金项目(42377147);中国国家铁路集团有限公司科技研究开发计划重点课题(N2023G070);中国铁路设计集团有限公司科技开发计划重点课题(2023BTJ07)。

摘　　要：为掌握高铁水下盾构隧道在变化荷载作用下的力学行为,利用有限元方法对隧道在不同埋深和水深条件下的内力和变形进行理论计算和分析,系统总结内力和变形的分布特征变化规律、量化表征关系及相关的敏感性变化特点。研究表明,横断面上内力和变形分布特征主要受埋深变化影响,且不同位置的内力和变形水平变化规律各异。内力和变形与荷载呈正相关,同时横断面上内力和变形最大值与荷载基本为线性关系;除最大轴力、负弯矩及最小变形外,其余内力与变形的最大值和最小值出现位置均不受荷载变化影响。典型位置内力和变形量均可用荷载的二元线性函数表示,相较之下轴力对水深变化更敏感,而弯矩、剪力和变形量则对埋深变化更敏感。各位置内力对荷载变化的敏感度基本关于拱腰连线对称。相较于水位变化,冲淤变化对水下盾构隧道结构受力影响更大。To understand the mechanical behaviors of the underwater shield tunnel(UST)under varying loading,theoretical simulations and analyses were conducted on an UST subjected to different burial depths and water depths.The variation principles of distribution characteristics,quantitative relationship and sensitivity for the internal force and deformation were fully summarized.The results show that,distribution characteristics of internal force and deformation are mainly determined by burial depth.Furthermore,the variation laws of internal force and deformation levels at different positions in the cross section are quite different.The internal force and deformation both positively correlate with loadings,and their maximum and minimum values are almost linearly dependent on the loadings.The positions where the maximum and minimum internal force and deformation occurred remain unchanged,except for the maximum axial force,negative bending momentum and minimum deformation.A binary linear function can exactly describe the relationship between internal force,deformation and loadings.Axial force is more sensitive to the variation of water depth,while bending momentum,shear force,and deformation are more sensitive to the variation of burial depth.The sensitivity of internal force to the loading change is basically symmetric about the arch line.Compared with the variation of water level,the tunnel is more vulnerable to the changing of burial depth.

关 键 词：高速铁路 盾构隧道 数值计算 内力 变形 量化关系 敏感性 

分 类 号：U238[交通运输工程—道路与铁道工程] U455.43[建筑科学—桥梁与隧道工程]