本文選題：泡沫混凝土 + 寒區(qū)隧道��； 參考：《冰川凍土》2016年02期

【摘要】：復(fù)雜地層寒區(qū)隧道填充材料需兼具防寒保溫、抗震和優(yōu)化支護(hù)等性能,為解決常規(guī)泡沫混凝土在復(fù)雜地層寒區(qū)隧道應(yīng)用中存在的不足,通過正交試驗得到了自制泡沫混凝土的最佳配合比,研制了一種高強(qiáng)防寒保溫泡沫混凝土.通過室內(nèi)試驗,研究了所制泡沫混凝土的保溫性能和凍融劣化特征,并采用數(shù)值分析方法探討了西藏嘎隆拉隧道初襯和二襯之間加設(shè)泡沫混凝土墊層后的溫度場變化規(guī)律.結(jié)果表明:該泡沫混凝土具有較好的保溫性能和抗凍融損傷性能,同時強(qiáng)度、延性較普通泡沫混凝土都有明顯改善.數(shù)值計算結(jié)果顯示,當(dāng)在初襯和二襯之間增設(shè)泡沫混凝土墊層時,其相應(yīng)位置的溫度變幅由不設(shè)置時的4.5℃變?yōu)?℃,最低溫度由1℃提高到了3℃,表明加設(shè)所研制泡沫混凝土墊層對于阻止圍巖受到隧道內(nèi)冷空氣的侵害具有非常顯著的效果.
[Abstract]:In order to solve the problems existing in the application of conventional foam concrete in the tunnel in the cold region of complex formation, the filling material of tunnel must have the properties of preventing cold and heat preservation, aseismic and optimized support and so on. The optimum mix ratio of self-made foam concrete was obtained by orthogonal test and a kind of high strength cold-proof and thermal insulation foam concrete was developed. The thermal insulation performance and freeze-thaw deterioration characteristics of the foam concrete are studied through laboratory tests, and the variation of temperature field after adding foam concrete cushion between the first lining and the second liner of the Galongla Tunnel in Tibet is discussed by using numerical analysis method. The results show that the foam concrete has better thermal insulation and anti-freeze-thaw damage performance, and the strength and ductility of the foam concrete are obviously improved than that of ordinary foam concrete. The numerical results show that when the foam concrete cushion is added between the first and second linings, the temperature range of the corresponding position changes from 4.5 鈩，

本文編號：1865705