کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4927223 1431694 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of dynamic properties of sandy soil at high cyclic strains
ترجمه فارسی عنوان
بررسی خواص پویای خاک ماسه ای در سویه های سیکل بالا
کلمات کلیدی
فشار برشی بالا، مدول برشی، نسبت دمیدن، آزمون کنترل با فشار، آزمون تریسی سیکل، حلقه پسماند،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی
Dynamic loading conditions, such as earthquakes, may result in the generation of high shear strain (>5%) in the soil. Conventionally, dynamic properties of soils are estimated from the tests conducted up to a shear strain of 1% by considering Symmetrical Hysteresis Loop (SHL). However, it is commonly observed that the hysteresis loops become progressively asymmetric with increasing shear strain, which leads to the over- or under-estimation of the conventionally evaluated dynamic properties. Hence, it is necessary to adopt a modified methodology of evaluating the dynamic properties of saturated sands based on the actual Asymmetrical Hysteresis Loop (ASHL). Strain-controlled cyclic triaxial tests have been conducted, for a peak shear strain range of 0.015-4.5% at 1 Hz loading frequency, on test specimens prepared at different relative density (30-90%) and confining stress (50-150 kPa). Although, the shear modulus evaluated considering SHL and ASHL are on close agreement, the damping ratio evaluated considering SHL is approximately 40-70% lesser than that obtained by considering ASHL. Moreover, in contrast to the classical curves as largely applied in geotechnical engineering, a noticeable decrement of the damping ratio is observed beyond 0.75% shear strain.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Dynamics and Earthquake Engineering - Volume 99, August 2017, Pages 157-167
نویسندگان
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