可液化场地中盾构隧道注浆加固抗液化技术研究  

Research on anti-liquefaction technology of grouting reinforcement for shield tunnel in liquefiable site

作　　者：李名淦[1,2] 贾明辉 栗书亚 潘菁 陶连金 Li Minggan;Jia Minghui;Li Shuya;Pan Jing;Tao Lianjin(Key Laboratory for Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;Beijing General Municipal Engineering Design&Research Institute Co.Ltd.,Beijing 100082,China;Key Laboratory of Urban Security&Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京交通大学城市地下工程教育部重点实验室,北京100044 [2]北京市市政工程设计研究总院有限公司,北京100082 [3]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《黑龙江科技大学学报》2025年第1期110-116,共7页Journal of Heilongjiang University of Science And Technology

基　　金：国家自然科学基金项目(42072308);北京市自然科学基金项目(8242005)。

摘　　要：强震作用下饱和砂土层液化会严重损害区间隧道结构,研究盾构隧道的抗液化措施对提升抗震设计和安全性至关重要。以北京轨道交通22号线穿越严重液化土层区段为背景,利用FLAC^(3D)软件建立数值模型,引入超孔隙水压力比(PPR)作为评估土体液化程度的指标。通过分析不同埋深条件下,注浆加固前后盾构隧道的内力、变形及砂土层PPR的响应特征。结果表明:拱顶、拱肩及拱脚位置的土体液化程度较低或无液化现象,而拱腰及拱底位置的土体易发生液化。注浆加固措施能够有效降低隧道周围土体的PPR值,具有显著的抗液化效果,加固后,隧道结构的内力和直径收敛率均显著降低。注浆加固技术能够有效控制隧道结构内力,预防因内力过大导致的管片破坏。This paper is concerned with the insight that liquefaction of saturated sand layers during strong earthquakes poses serious threats to interval tunnel structures,making the study of anti-liquefaction measures for shield tunnels crucial for improving seismic design and ensuring structural safety.By taking Beijing Metro Line 22,which traverses a severely liquefiable soil section,the study involves developing a numerical model by using FLAC^(3D)software;introducing the excess pore water pressure ratio(PPR)as an indicator to assess the degree of soil liquefaction;and analyzing the response characteristics of tunnel internal forces,deformations,and PPR values in sand layers under different burial depths before and after grouting reinforcement.The results indicate that the soil at the crown,haunch,and footing of the tunnel exhibits low or no liquefaction,while the liquefaction is more likely to occur at the spandrel and invert.Grouting reinforcement effectively reduces the PPR values of the soil surrounding the tunnel,demonstrating significant anti-liquefaction effects.After reinforcement,the tunnel structure′s internal forces and diameter convergence rates are significantly reduced.The grouting technology can effectively control the internal forces of the tunnel structure and prevent the damage to the segments caused by excessive forces.

关 键 词：盾构隧道 液化 饱和砂土 注浆加固 抗液化技术 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]