摘要
[目的]岩土二元体地层作为一种典型的上软下硬复合地层,其复杂的地质条件对曲线地段盾构隧道施工的地层变形机制及力学响应具有显著影响,深入分析不同施工条件下的响应至关重要。[方法]以济南轨道交通3号线滩头站-稻香站区间盾构施工为背景,采用数值模拟与现场监测结合的研究方法,系统分析了围岩变形、管片应力应变及施工参数优化的关键问题,揭示了岩土二元体地层下的施工力学响应,并在此基础上优化设计了施工措施与参数。[结果及结论]岩土二元体对于曲线地段隧道的影响大于直线地段隧道,曲线地段盾构的位移最大值出现在左拱肩处,且曲线地段盾构左拱肩的受影响范围要大于拱顶;在岩土二元体区域,曲线地段盾构处的围岩变形明显大于直线盾构,但曲线地段盾构隧道的变化幅度始终小于直线盾构隧道,且表现为拱顶沉降比拱底隆起更敏感;曲线地段盾构管片的第一、三主应力及变形量均大于直线地段盾构,尤其在距离岩土二元体2 m范围内应力增幅显著。提出了“微扰动精细化掘进+洞内超前注浆加固”的综合控制方案和相应参数,并验证了其有效性,揭示了岩土二元体地层倾角对注浆加固范围的影响规律,指出当倾角小于65°时需适当增大加固宽度。
[Objective]The rock-soil binary stratum is a typ-ical upper-soft and lower-hard composite stratum.Due to its complex geological conditions,this stratum significantly influ-ences the stratum deformation mechanism and mechanical re-sponse of shield tunnel construction in curved sections.It is crucial to carry out an in-depth analysis on the response under different construction conditions.[Method]Taking the shield tunneling construction between Tantou Station and Daoxiang Station section of Jinan Rail Transit Line 3 as the background,a research method combining numerical simulation and on-site monitoring is adopted to systematically analyze the key issues of surrounding rock deformation,segment stress and strain,and construction parameter optimization,revealing the con-struction mechanical responses of the two under the rock-soil binary stratum,and optimizing the construction measures and parameters on this basis.[Result&Conclusion]The rock-soil binary stratum has a greater impact on curved tunnels than on straight tunnels,with the maximum curved shield tunnel displacement occurring at the left arch shoulder,and the affect-ed range of the left arch shoulder in the curved section shield is larger than that of the vault.In the rock-soil binary zone,the surrounding rock deformation of the curved section shield is significantly greater than that of the straight shield,yet the de-formation amplitude of the curved section shield tunnel remains smaller than that of the straight shield tunnel,with the vault settlement being more sensitive than the arch bottom uplift.The first and third principal stresses and deformations of the curved section shield segments are greater than those in the straight section,especially within 2 m from the rock-soil bina-ry,the stress increase is significant.A comprehensive control scheme and corresponding parameters of"micro-disturbance re-fined excavation+inner tunnel advanced grouting reinforce-ment"are proposed,and its effectiveness is verified,revealing the influence law of the rock-soil binary stratum dip angle on the grouting reinforcement range,and pointing out that when the dip angle is less than 65°,the reinforcement width needs to be appropriately increased.
作者
孙捷城
谯殿君
王建
王渭明
吕显州
SUN Jiecheng;QIAO Dianjun;WANG Jian;WANG Weiming;LYU Xianzhou(Jinan Rail Transit Group Co.,Ltd.,250100,Jinan,China;Transport College,Southeast University,210096,Nanjing,China;Shandong University of Science and Technology,266590,Qingdao,China;Jinan Transit Development Investment Co.,Ltd.,250100,Jinan,China;Qingdao Metro Group Co.,Ltd.Third Construction Branch,266045,Qingdao,China)
出处
《城市轨道交通研究》
北大核心
2025年第8期88-94,共7页
Urban Mass Transit
基金
山东省重点研发计划项目(2021CXGC011203)
山东省自然科学基金项目(ZR2021QE187,ZR2020QE269)
山东省住建厅科学技术项目(2019-K7-12)。
关键词
地铁
岩土二元体地层
曲线地段盾构施工
施工响应分析
控制参数
数值模拟
metro
rock-soil binary stratum
curved section shield construction
construction response analysis
control parameters
numerical simulation
作者简介
第一作者:孙捷城,高级工程师,jinanguidao123@126.com;通信作者:吕显州,副教授,lyuxianzhou0608@sdust.edu.cn。
