高地温隧洞温度场三维数值模拟分析

发布时间：2018-04-12 13:44

  本文选题：引水隧洞 + 高地温　； 参考：《水利水电技术》2017年11期

【摘要】：在高地温条件下,温度场是影响引水隧洞结构稳定的重要因素。为了研究不同工况下引水隧洞的温度场特性,以新疆布仑口—公格尔水电站高地温引水隧洞为依托,采用有限元仿真模拟的方法建立三维模型,对不同工况下高地温引水隧洞围岩及衬砌结构的稳态温度场特性进行了模拟计算,并取衬砌结构及围岩不同测点的温度场特性值进行对比分析。结果显示:受洞口及掌子面影响,围岩及衬砌温度随洞深增大可分为平缓段和骤升段两个阶段,且呈非线性变化。衬砌腰拱与顶拱内表面温差随洞深增大逐渐减小,且与工况有关,施工期最大值为1.26℃,运行期最大值为0.22℃。从模拟结果与实测结果的对比分析可知,实测与模拟所得围岩温度场分布特性相同。研究成果可为高地温引水隧洞热力耦合分析及其洞室稳定性提供了理论依据,同时也可为高地温区相关工程提供参考。
[Abstract]:Under the condition of high ground temperature, the temperature field is an important factor affecting the stability of diversion tunnel structure.In order to study the temperature field characteristics of diversion tunnel under different working conditions, based on the highland temperature diversion tunnel of Brunkou-Gongge Hydropower Station in Xinjiang, a three-dimensional model was established by using finite element simulation method.The steady-state temperature field characteristics of surrounding rock and lining structure of highland temperature diversion tunnel under different working conditions are simulated and calculated, and the characteristic values of temperature field of lining structure and surrounding rock at different measuring points are compared and analyzed.The results show that the temperature of surrounding rock and lining can be divided into two stages with the increase of the depth of the tunnel by the influence of the orifice and the face of the tunnel, and the temperature of the surrounding rock and lining can be divided into two stages: the flat section and the sudden rise section.The temperature difference between the lining waist arch and the top arch gradually decreases with the increase of the hole depth, and is related to the working conditions. The maximum value during construction is 1.26 鈩，

本文编号：1739996