高地热大埋深环境隧道支护结构受力分析

发布时间：2018-01-04 04:30

本文关键词：高地热大埋深环境隧道支护结构受力分析　出处：《西南交通大学学报》2014年02期 　论文类型：期刊论文

【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.
[Abstract]:In order to study the high heat deep under the environment of tunnel supporting structure internal force with the ambient temperature changes, the indoor model test in different temperature condition of tunnel structure stress model design, and the model test was simulated and analyzed. The model test of axial force of more than 20% numerical simulation results. The distribution of axial force of the same trend, close to the structure safety coefficient. Taking a tunnel project as an example, analysis of buried depth is 1000 m by numerical simulation, geothermal temperature conditions of 60 DEG C, heat insulation layer is arranged on the tunnel support structure, system characteristics and safety. The results showed that: insulation is provided on the supporting structure internal force distribution form, less influence of primary support and concrete formworking supporting structure internal force, but on the two lining stress can significantly improve the security system, small heat insulation layer after two lining The number is raised from 2 to 4.0.

【作者单位】：西南交通大学峨眉校区;西南交通大学土木工程学院;
【基金】：铁道部科技开发计划资助项目(2008G028-B)
【分类号】：U455.4
【正文快照】： 随着我国交通事业的发展,修建的深埋长大隧道越来越多.长大隧道可能穿越各种地层,并产生多种地质灾害.其中高地温在长大隧道施工过程中成为较突出的问题.例如,瑞士埋深为2 136 m的辛普伦隧道的地温达到55.4℃,日本安房公路隧道最大埋深仅700 m,但地温达到了77.5℃[1].据初步勘

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