کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8915544 1641103 2018 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shear weakening for different lithologies observed at different saturation stages
ترجمه فارسی عنوان
تسریع برش برای لیتولوژی های مختلف در مراحل اشباع مختلف مشاهده شده است
کلمات کلیدی
مدول برشی، تسریع برش، سخت شدن برش، سرعت موج فشاری، سرعت موج برشی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
For this study, samples from different lithologies (“Leitha”-limestone, “Dachstein”-limestone, “Haupt”-dolomite, “Bunt”-sandstone, Grey Berea sandstone, granite, quartzite and basalt) were selected. Samples were dried at 70 °C, respectively 105 °C and were saturated with brine. Mass, porosity, permeability, compressional and shear wave velocity were determined from dry and brine saturated samples at laboratory conditions, based on an individual measurement program. Shear modulus was calculated to find out, if shear weakening exists for the dataset. Shear weakening means that shear modulus of dry samples is higher than of saturated samples, but it is assumed that shear modulus is unaffected by saturation. “Dachstein”-limestone and basalt show shear weakening, quartzite samples show both weakening and hardening. Granite samples are affected by temperature, after drying with 105 °C no change can be observed anymore. “Bunt”-sandstone samples show a change in the shear modulus in a small extent, although they may contain clay minerals. The other lithologies show no effect. Explanations for carbonate samples can be the complicated pore structure, for basalt it could be that weathering creates clay minerals which are known as causes for a change of the shear modulus. Fluid viscosity can also be an important factor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Applied Geophysics - Volume 148, January 2018, Pages 107-114
نویسندگان
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