CAJ | 학술논문

通过ANSYS有限元数值模拟软件，建立了铁路隧道整体式衬砌的二维热力耦合有限元计算模型，基于ISO834标准火灾温升曲线，对不同单双线和不同等级围岩的铁路隧道整体式衬砌（单线III级围岩衬砌、双线III级围岩衬砌、单线IV级围岩衬砌、双线IV围岩衬砌）的火灾力学响应行为进行了数值模拟研究，获得了火灾作用下，不同的铁路隧道整体式衬砌拱顶竖向位移、边墙侧向位移、压应力、剪切应力的变化情况。结果表明：双线整体式衬砌拱顶的竖向位移大于单线整体式衬砌，围岩等级越大整体式衬砌拱顶的竖向位移越大，整体式衬砌承受的最大压应力和最大剪切应力随时间集中在不同厚度层的混凝土区域上。所获得的结论可为铁路隧道整体式衬砌的防火设计和安全性研究提供理论参考。
통과ANSYS유한원수치모의연건，건립료철로수도정체식츤체적이유열력우합유한원계산모형，기우ISO834표준화재온승곡선，대불동단쌍선화불동등급위암적철로수도정체식츤체（단선III급위암츤체、쌍선III급위암츤체、단선IV급위암츤체、쌍선IV위암츤체）적화재역학향응행위진행료수치모의연구，획득료화재작용하，불동적철로수도정체식츤체공정수향위이、변장측향위이、압응력、전절응력적변화정황。결과표명：쌍선정체식츤체공정적수향위이대우단선정체식츤체，위암등급월대정체식츤체공정적수향위이월대，정체식츤체승수적최대압응력화최대전절응력수시간집중재불동후도층적혼응토구역상。소획득적결론가위철로수도정체식츤체적방화설계화안전성연구제공이론삼고。
A two‐dimensional thermo‐mechanical coupled finite element model of the railway tunnel monolithic lining has been established by ANSYS .On the basis of the ISO834 standard fire temperature rise curve ,the mechanical response behavior in fire of the monolithic lining at railway tunnel (single‐track and double‐track tunnel under grade III surrounding rock ,single‐track and double‐track tunnel under grade IV surrounding rock) has been investigated by numerical method .Variations in crown vertical displacement ,lateral displacement of side wall ,the compressive stress and shear stress of the railway tunnel monolithic lining exposed to fire are obtained .The results indicate that the crown vertical displacement in double‐track tunnel monolithic lining is greater than that in single‐track tunnel monolithic lining ,and the crown vertical displacement of the monolithic lining under grade IV surrounding rock is greater than that in grade III surrounding rock .It is also found that the maximum compressive stress and maximum shear stress would vary along the layer in concrete against time .