دانلود مقاله انگلیسی رایگان:قوانین توزیع چرخه انجماد و ذوب و آزمایش های بتن اشباع نشده در تونل های منطقه سرد - 2020
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  • Distribution laws of freeze-thaw cycles and unsaturated concrete experiments in cold-region tunnels Distribution laws of freeze-thaw cycles and unsaturated concrete experiments in cold-region tunnels
    Distribution laws of freeze-thaw cycles and unsaturated concrete experiments in cold-region tunnels

    سال انتشار:

    2020


    عنوان انگلیسی مقاله:

    Distribution laws of freeze-thaw cycles and unsaturated concrete experiments in cold-region tunnels


    ترجمه فارسی عنوان مقاله:

    قوانین توزیع چرخه انجماد و ذوب و آزمایش های بتن اشباع نشده در تونل های منطقه سرد


    منبع:

    Sciencedirect - Elsevier - Cold Regions Science and Technology, 172 (2020) 102985: doi:10:1016/j:coldregions:2019:102985


    نویسنده:

    Peng Xua, Yimin Wua, Zijian Wanga,⁎, Le Huangb


    چکیده انگلیسی:

    Studying tunnel temperature fields could prevent frost damage. However, few studies have revealed the distribution laws of freeze-thaw cycles in cold-region tunnels. In this study, the distribution laws of freeze-thaw cycles in a tunnel were carried out, and the concrete deterioration induced by freeze-thaw cycling was explored. First, in situ monitoring equipment was used to collect the temperature in the longitudinal direction of the tunnels. A one-dimensional heat transfer model was used to analyze the temperature distribution in the circumferential direction of the tunnels, where a function was proposed to describe both the annual and diurnal temperature fluctuations. After that, the distribution laws of freeze-thaw cycles inside a tunnel were investigated. Specifically, in the tunnel longitudinal direction, the number of freeze-thaw cycles decreased from the entrance to the middle and then increased while approaching the exit, thereby exhibiting a V-shaped distribution. In the circumferential direction, the intrados lining nearly always exhibited freeze-thaw cycles. The number of freeze-thaw cycles and the temperature amplitude decreased rapidly with increasing depth. Furthermore, a series of unsaturated concrete experiments were performed to explore the concrete deterioration under different numbers of freeze-thaw cycles. The results showed that after being subjected to 100 freeze-thaw cycles, the concrete specimens displayed visible damage, whereas the concrete compressive strength was not affected. These findings can enrich the research of freeze-thaw cycles for cold-region tunnels and are significant for guiding tunnel maintenance.
    Keywords: Cold-region tunnels | Temperature field | Freeze-thaw cycles | Unsaturated concrete | Numerical simulation


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 9
    حجم فایل: 2840 کیلوبایت

    قیمت: رایگان


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