کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6782175 | 1432267 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Velocity-frequency-amplitude-dependent frictional resistance of planar joints under dynamic normal load (DNL) conditions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
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چکیده انگلیسی
The problem of how dynamic friction of faults influences the observed earthquakes remains largely unsolved. Our paper presents results of experiments aimed to understand the complex frictional behavior of faults under dynamic normal load (DNL) conditions under consideration of horizontal slip velocity, dynamic normal force amplitude and normal impact frequency using a dynamic shear box device. Data were obtained by continuous measurements of shear and normal forces as well as corresponding displacements. We identified a phase shift between peak normal force and peak shear force with peak shear force lagging. Consequently, the dynamic friction coefficient shows cyclic behavior and the minimum value of the dynamic friction coefficient increases with increasing of slip velocity which is in conflict to the traditional views under constant normal load (CNL) conditions. We found, that dynamic fault friction coefficient during earthquakes may increase or decrease depending on velocity-frequency (VF), velocity-amplitude (VA) and velocity-frequency-amplitude (VFA) parameter. These findings have significant implications for seismic hazard assessment and reliable forecasting of earthquakes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tunnelling and Underground Space Technology - Volume 79, September 2018, Pages 27-34
Journal: Tunnelling and Underground Space Technology - Volume 79, September 2018, Pages 27-34
نویسندگان
Wengang Dang, Heinz Konietzky, Lifu Chang, Thomas Frühwirt,