• assessment of excavation damaged zone and excavation disturbed zone around circular tunnels; a new analytical solution

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 796
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     due to redistribution of in situ stresses, material around the tunnel is damaged creating three types of zones; namely the excavation disturbed zone (edz), the excavation damaged zone (edz) and the highly damaged zone (hdz). in this study, based on generalized hoek and brown failure criterion, an analytical solution is presented for assessment of edz and edz thickness. the suggested closed form method allows one to calculate nonlinear distribution of induced stresses in edz and edz along with the thickness of edz for a circular tunnel subjected to hydrostatic stress condition. comparison of the results obtained from analytical solution with the results of prototype hoek and brown showed the differences to be insignificant. the maximum relative error for edz thickness value and the radial stress at edz-edz interface were found to be 5% and 3.5% respectively.

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