考虑隔热层的高岩温隧道温度场和应力场分布规律研究

发布时间：2018-06-06 12:02

  本文选题：高岩温隧道 + 热弹性　； 参考：《应用力学学报》2017年05期

【摘要】：高岩温热害问题是深埋隧道面临的难点问题之一。高岩温不仅会恶化施工环境、影响施工材料的选择和混凝土的耐久性等,高温带来的温度应力还会引起衬砌的开裂和围岩的变形等。为分析高岩温作用下隧道结构和围岩的温度场、应力场分布规律,根据简化的理论模型,建立了隧道的热传导方程和平衡方程,并利用量纲归一化和微分方程级数求解的方法得到了隧道结构和围岩的温度场、位移场、应力场的解析解。以典型的高原地热隧道-拉日铁路吉沃希嘎隧道为例进行详细地分析。研究发现:隔热层能有效地阻隔热量传递,减少围岩热量的散失;铺设隔热层后,初衬的温度升高;增加隔热层厚度可以加强隔热效果,但隔热层厚度的选择要综合考虑初衬温度以及材料性能变化的影响。
[Abstract]:The thermal damage of high rock is one of the difficult problems faced by deep buried tunnels. High rock temperature will not only worsen the construction environment, affect the selection of construction materials and the durability of concrete, but also cause the cracking of lining and the deformation of surrounding rock caused by high temperature. In order to analyze the distribution of temperature field and stress field of tunnel structure and surrounding rock under the action of high rock temperature, the heat conduction equation and equilibrium equation of tunnel are established according to the simplified theoretical model. The analytical solutions of temperature field, displacement field and stress field of tunnel structure and surrounding rock are obtained by means of dimensionality normalization and differential equation series solution. Taking the typical highland geothermal tunnel as an example, the Jivoxiga tunnel of Laj railway is analyzed in detail. It is found that the heat insulation layer can effectively block the heat transfer and reduce the heat loss of the surrounding rock; the temperature of the initial lining increases after the heat insulation layer is laid; and the heat insulation effect can be enhanced by increasing the thickness of the thermal insulation layer. However, the influence of the initial lining temperature and the material properties should be taken into account in the selection of the thickness of the insulating layer.
【作者单位】： 西安建筑科技大学;
【基金】：陕西省科技统筹创新工程计划项目(2015TZC-G-8-9)
【分类号】：U451
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本文编号：1986453