摘要
为明确温度变化对寒区隧道长期稳定性的影响,以某寒区隧道工程为研究对象建立了水热力耦合模型,研究了未来50年隧道温度场、应力场和变形场的时变特征和规律。在此基础上,采用响应面法计算分析了该隧道的可靠性。结果表明:第50年隧道围岩冻融范围将达到1.1 m,比建设初期增大了1倍;隧道拱顶处压应力和底板处拉应力逐年上升,且在冻融循环中随着水分迁移,隧道底板发生底鼓灾害的风险较大;隧道可靠性指标随时间的增长呈逐渐下降趋势,第50年该隧道的失效概率为5.69%,可靠性指标为1.9723。
To determine the long-term stability of cold region tunnel affected by climate warming,taking one tunnel as an example,the coupling model of the moisture-heatstress fields was built and the temperature field,stress field,and deformation field were all studied in 50 years.Based on these,the response surface method was used to calculate the reliability of tunnel engineering.The results indicate that the freeze-thaw ranges will be about 1.1 m 50 years later,which is twice as large as that in the initial stage of construction.Compressive stress of vault and tensile stress of tunnel floor increase with time,and floor heave will become during freeze-thaw.It is concluded that the long-stability of this tunnel can satisfy with the designing requirements using the designed structures and insulation measures.The reliability indexes decrease with time increasing.In the 50th year,the failure probability and reliability index respectively will be 5.69%and 1.9723.
作者
李中英
崔永鹏
贾剑青
辛成平
LI Zhong-ying;CUI Yong-peng;JIA Jian-qing;XIN Cheng-ping(School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou 730000, China;Longxi Train Depot, China Railway Lanzhou Group Co., Ltd., Longxi 743000, China)
出处
《科学技术与工程》
北大核心
2022年第5期2032-2039,共8页
Science Technology and Engineering
基金
甘肃省科技计划(20YF8FA042)。
关键词
寒区隧道
冻融
可靠性
长期稳定性
cold region tunnel
freeze-thaw
reliability
long-stability