CAJ | 학술논문

在分析现有3种双层衬砌数值模型的基础上，提出改进的双层衬砌盾构隧道衬砌梁-接头弹簧-结合面压杆弹簧组合分析模型。该模型采用压杆、结合面点位移耦合等技术，解决现有模型中地层与衬砌之间、双层衬砌结合面之间存在拉力以及结合面剪切应力与剪切位移无关等问题，提出适用于该模型的双层衬砌结合面和地层衬砌接触面参数计算依据，探讨结合面单元数量对分析结果的影响，研究杭长客运专线钱塘江隧道双层衬砌的力学行为。研究结果表明：(1)双层衬砌厚度增大将引起双层衬砌弯矩明显增大，其增大趋势与双层衬砌厚度增大趋势基本一致；(2)双层衬砌厚度的增大对轴力的影响甚微；(3)双层衬砌弯矩在管片衬砌和二次衬砌之间的分配比例与管片衬砌和二次衬砌的厚度相对比例无线性关系。研究结果对未来水下双层衬砌盾构隧道的设计分析具有一定的参考价值。
재분석현유3충쌍층츤체수치모형적기출상，제출개진적쌍층츤체순구수도츤체량-접두탄황-결합면압간탄황조합분석모형。해모형채용압간、결합면점위이우합등기술，해결현유모형중지층여츤체지간、쌍층츤체결합면지간존재랍력이급결합면전절응력여전절위이무관등문제，제출괄용우해모형적쌍층츤체결합면화지층츤체접촉면삼수계산의거，탐토결합면단원수량대분석결과적영향，연구항장객운전선전당강수도쌍층츤체적역학행위。연구결과표명：(1)쌍층츤체후도증대장인기쌍층츤체만구명현증대，기증대추세여쌍층츤체후도증대추세기본일치；(2)쌍층츤체후도적증대대축력적영향심미；(3)쌍층츤체만구재관편츤체화이차츤체지간적분배비례여관편츤체화이차츤체적후도상대비례무선성관계。연구결과대미래수하쌍층츤체순구수도적설계분석구유일정적삼고개치。
Based on three kinds of existing numerical models,a new analysis model with lining-segment joint-contact surface replaced by beam-spring-compression bar and spring combined element for shield tunnel with double-layer lining is improved. The problems of radial tension existing on the contact surface between strata and segment and between segment and secondary lining,and shear stress independent on shear displacement in contact surface between segment and secondary lining are solved by application of compression bar element,method of point displacement coupling,etc.. The formulas of some critical parameters are given. The influences of contact surface elements number on results are discussed. The mechanical behaviors of Qiantang River tunnel on a high speed railway from Hangzhou to Changsha are studied. The results show that:(1) The bending moment of double-layer lining increases obviously as its thickness increases,and the increasing trend of bending moment keeps basically consistent with that of double-layer lining thickness. (2) The increase of double-layer lining′s thickness has little effect on axial force of double-layer lining. (3) There is no linear relationship between distribution proportions of bending moment on segment and secondary linings and their thickness proportions. The research results have some reference value for the design and analysis of underwater double-layer lining shield tunnel in the future.