西藏某边坡冻土区温度场与应力场耦合数值分析

发布时间：2018-03-04 15:29

  本文选题：寒区边坡　切入点：冻融循环　出处：《金属矿山》2017年07期 　论文类型：期刊论文

【摘要】：针对西藏地区某水电边坡,在瞬态热传导原理基础上,建立了冻结区和融化区岩体瞬态温度场控制方程,模拟了在低温环境下边坡的温度场响应情况;通过在边坡的不同部位提取特征点,分析了岩体温度场随年气温的演化规律,研究了覆盖层和强风化层在冻结期和融化期的温度影响范围。在此基础上,利用直接耦合法分析了热效应和冻融循环情况下,边坡覆盖层和强风化层位移的变化情况。研究结果表明:边坡浅层岩体温度与环境温度有很强对应性,而边坡深层温度则基本保持在3~5℃,边坡冻结最大深度为4 m;覆盖层和强风化层位移受环境温度影响较大,其位移均随时间变化呈近似正弦分布;从影响程度上看,冻胀循环引起的位移变化要远大于热效应的影响。
[Abstract]:Based on the principle of transient heat conduction, the governing equations of transient temperature field of rock mass in freezing and melting areas are established for a hydropower slope in Tibet, and the response of slope temperature field in low temperature environment is simulated. By extracting characteristic points from different parts of slope, the evolution law of temperature field with annual temperature of rock mass is analyzed, and the influence of overburden and strongly weathered layer on temperature in freezing and melting period is studied. The direct coupling method is used to analyze the displacement changes of the overburden and strongly weathered layer in the case of thermal effect and freeze-thaw cycle. The results show that the temperature of the shallow rock mass of the slope has a strong correspondence with the ambient temperature. On the other hand, the deep layer temperature of the slope is maintained at 3 ~ 5 鈩，

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