摘要
针对寒区日益增长的工程需要,以大型寒区岩体隧道工程为背景,基于综合传热传质理论,充分考虑岩体介质双重孔隙的结构特点及水热梯度共同作用下水分的迁移与转化,建立岩体冻融过程水热迁移的理论模型,应用Galerkin法导出了这一问题的有限元公式。并以寒区大阪山隧道出口段k106+025处围岩为对象,在空间域内采用有限元网格划分,而在时间域内用有限差分网格划分的混合解法进行有限元计算,分析温度场和水分场变化规律。模拟结果与现有研究成果和工程经验类似,可验证模型的合理性,并为寒区冻融环境下岩体工程的安全性与稳定性分析提供一定的参考。
To the engineering demands for practical problems occurred in cold regions, on the background of large scale rock tunnel, the mathematical model of heat and mass transfer in the process of rock freeze-thaw was established by considering rock structure characteristic of dual porosity media, heat and moisture gradient on the seepage based on the theory of mass and energy transfer, and the finite element formulae of this problem were obtained from Galerkin~ method. Taking Daban mountain tunnel as example, the moisture-heat coupling process was numerically simulated by adopting the grid segmentation of the mixture cell in space domain and by the mixture solution of the finite differenee format segmentation in time domain, the varied law of moisture and temperature field in the rock tunnel was researched. The simulating result is similar to the current results and engineering experience, it can verify the correctness of the theoretical model and also provide some reference for the security and stability analysis of rock engineering in cold regions under freezing-thawing condition.
出处
《西安科技大学学报》
CAS
北大核心
2009年第3期305-309,共5页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金(40872177)
陕西省自然科学基金(SJ08A21)
陕西省教育厅专项基金(08JK359)
关键词
冻结岩体
水热耦合
理论模型
数值模拟
frozen rock
moisture-heat coupling
theoretical model
numerical simulation
