本文選題：寒區(qū)邊坡　切入點(diǎn)：凍融循環(huán)　出處：《金屬礦山》2017年07期 　論文類型：期刊論文

【摘要】：針對(duì)西藏地區(qū)某水電邊坡,在瞬態(tài)熱傳導(dǎo)原理基礎(chǔ)上,建立了凍結(jié)區(qū)和融化區(qū)巖體瞬態(tài)溫度場(chǎng)控制方程,模擬了在低溫環(huán)境下邊坡的溫度場(chǎng)響應(yīng)情況;通過在邊坡的不同部位提取特征點(diǎn),分析了巖體溫度場(chǎng)隨年氣溫的演化規(guī)律,研究了覆蓋層和強(qiáng)風(fēng)化層在凍結(jié)期和融化期的溫度影響范圍。在此基礎(chǔ)上,利用直接耦合法分析了熱效應(yīng)和凍融循環(huán)情況下,邊坡覆蓋層和強(qiáng)風(fēng)化層位移的變化情況。研究結(jié)果表明:邊坡淺層巖體溫度與環(huán)境溫度有很強(qiáng)對(duì)應(yīng)性,而邊坡深層溫度則基本保持在3~5℃,邊坡凍結(jié)最大深度為4 m;覆蓋層和強(qiáng)風(fēng)化層位移受環(huán)境溫度影響較大,其位移均隨時(shí)間變化呈近似正弦分布;從影響程度上看,凍脹循環(huán)引起的位移變化要遠(yuǎn)大于熱效應(yīng)的影響。
[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，

本文編號(hào)：1566250