نوع مقاله : مقاله پژوهشی
نویسندگان
1 دکترا، گروه زمین شناسی مهندسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران
2 استاد، گروه زمین‌شناسی مهندسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران
3 دانشیار، گروه زمین شناسی مهندسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران
چکیده
در این پژوهش آزمایشگاهی اثر تراکم درزه (تعداد و فاصله‌داری) بر سرعت موج طولی در سنگ‌های آذرآواری مورد بررسی قرار گرفته است. پس از تعیین مشخصات فیزیکی، اندازه‌گیری سرعت موج طولی (Pressure or Longitudinal wave) بر روی نمونه‌‌های سنگ بکر انجام شد. در ادامه با ایجاد 1 درزه مصنوعی در نمونه‌ها، آزمون سرعت موج تکرار شد. این عمل تا ایجاد 5 درزه و با دو آرایش فاصله‌داری 2 و 5 سانتی‌متر ادامه یافت و در پایان داده‌های به دست آمده با استفاده از روش آماری تجزیه و تحلیل شد. نتایج نشان می‌دهد که سرعت موج طولی با افزایش تعداد درزه‌ها در هر دو آرایش فاصله‌داری کاهش یافته است و در این خصوص رابطه خطی معکوسی به دست آمد. با این حال همزمان با افزایش تعداد درزه‌ها، روند کاهشی سرعت موج در دو آرایش فاصله‌داری با هم متفاوت است؛ به گونه‌ای که برای 1 تا 3 درزه اول، میزان کاهش سرعت موج در فاصله‌داری 5 سانتی‌متر بیشتر از فاصله‌داری 2 سانتی‌متر می باشد؛ اما در تعداد درزه‌های بیشتر از 3، روند مذکور معکوس شده است. به طور کلی فاصله‌داری کمتر، اثر کاهشی (میرایی) بیشتری بر سرعت موج طولی دارد؛ به گونه‌ای که در مجموع 5 درزه، میزان کاهش سرعت موج در فاصله‌داری 2 سانتی‌متر بیشتر از فاصله‌داری 5 سانتی‌متر بوده است.
کلیدواژه‌ها
موضوعات
کتابنگاری
بلاغی، ز.، صادقیان، م. و قاسمی، ح.، 1389- پتروژنز سنگ های آذرین پالئوزوئیک زیرین جنوب بهاباد (بافق، ایران مرکزی)؛ شاهدی بر کافت زایی، نشریه پترولوژی، دوره 1، شماره 4، صص. 45 تا 64.
مهندسین مشاور سازهپردازی ایران، 1394- گزارش مطالعات زمین‌شناسی مهندسی محدوده معدنی ناریگان. ص 27.
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