CAJ | 학술논문

根据无锡地铁原状土样的室内三轴蠕变试验，结合Bingham模型和Kelvin模型构建蠕变本构方程，采用最小二乘法回归土体蠕变参数，将此蠕变本构方程和弹塑性理论相结合推导出可以考虑时间因素的隧道周边地层特征曲线方程，给出求解隧道周边变形和支护力随时间变化的一种简便实用的方法。结合无锡地铁1号线工程实例，分析管片支护力与变形随时间的变化规律。结果表明，考虑蠕变后随着时间的增加，相同支护力下会发生更大的变形，而限定某一变形需要更大的支护力；土体蠕变对管片支护力与洞周变形的影响还与管片的刚度有关。
근거무석지철원상토양적실내삼축연변시험，결합Bingham모형화Kelvin모형구건연변본구방정，채용최소이승법회귀토체연변삼수，장차연변본구방정화탄소성이론상결합추도출가이고필시간인소적수도주변지층특정곡선방정，급출구해수도주변변형화지호력수시간변화적일충간편실용적방법。결합무석지철1호선공정실례，분석관편지호력여변형수시간적변화규률。결과표명，고필연변후수착시간적증가，상동지호력하회발생경대적변형，이한정모일변형수요경대적지호력；토체연변대관편지호력여동주변형적영향환여관편적강도유관。
A creep constitutive equation was established with combination of the Bingham creep model and Kelvin creep model , based on a triaxial creep experiment on the undisturbed soil in the subway system of Wuxi City .The soil creep parameters were determined using the least squares algorithm , and a time-dependent ground characteristic curve equation for the tunnel was deduced based on the established creep constitutive equation and the elastic -viscoplastic theory .A simple and applicable method for studying the deformation surrounding the tunnel and the supporting force varying with time is proposed .The variation of the segment supporting force and deformation with time was analyzed through a case study of a section of the Wuxi Subway Line No .1.The results show that , first, after creeping , greater deformation will occur over time with the same supporting force , while a larger supporting force will be needed to restrict deformation within a certain range , and, second, the influence of soil creep on the segment supporting force and the deformation surrounding the tunnel is correlated with the stiffness of the segments .