【摘要】 为了研究高地热大埋深环境下隧道支护结构内力随周围介质温度变化的规律,设计了测试不同温度环境条件下隧道模型结构受力的室内模型试验,并对模型试验进行了数值模拟分析.模型试验测得的轴力比数值模拟结果大20%,两者的轴力分布趋势相同,结构安全系数接近.以某隧道工程为例,用数值模拟方法分析了埋深为1 000 m、地热温度为60℃的环境条件下,隔热层设置对隧道支护结构体系受力特征及安全性的影响,结果表明:隔热层的设置对支护结构内力分布形式、初支和混凝土模筑支护结构内力的影响较小,但对二次衬砌受力有显著改善作用,设隔热层后二次衬砌的最小安全系数由2.0提高到4.0.更多还原

【Abstract】 To study the behavior of stress varying with the ambient temperature in lining structures of high geothermal and deep-buried tunnels,a laboratory model test was designed to measure the structural stress of a tunnel model at various temperatures. Then,a numerical simulation analysis of the model test was conducted. A comparison of the two groups of data revealed that the axial force values obtained by model test were approximately 20% larger than the simulated values,but their distribution trend are similar,and the structural safety factors were approximately equal. Taking a tunneling project as an example,the numerical simulation method was adopted to analyze the effect of insulating layer on the stress characteristics and safety of the tunnel lining structure at 60 ℃ under a buried depth of 1 000 m. The results show that the insulating layer has a small effect on both the internal force distribution pattern of the supporting structure and the internal force of the primary lining and the cast concrete lining. The insulting layer,however,can remarkably improve the stress state of the secondary lining,and the minimum safety factor of the tunnel’s secondary lining structure increases from 2. 0 without a insulting layer to 4. 0 when the insulting layer is set.更多还原