اثر تراکم درزه بر سرعت سیر موج طولی

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


عنوان مقاله [English]

The effect of joint density on P-wave velocity

نویسندگان [English]

  • Yaghoob Zarei 1
  • Ali Uromeihy 2
  • MohammadReza Nikoodel 3
1 Ph.D., Department of Engineering Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
2 Professor, Department of Engineering Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
3 Associated Professor, Department of Engineering Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
چکیده [English]

In this labratory study, the effect of joint density (number and spacing) on the pressure wave velocity was researched in pyroclastic rocks. After determining the physical properties, the P-wave velocities of intact rock samples were measrued. Then, an artificial joint perpendicular to the measuring direction was created in each sample, and the wave velocity tests were repeated. These tests were continued up to 5 joints with two sets of 2 and 5 cm spacing. Consequently, the data were analyzed using the statistical methods. The results show that the P-wave velocity was decreased by increasing the number of joints in both spacing sets, and thus an inverse linear relationship was obtained. However, as the number of joints increases, the reduction rates of wave velocity were different at two spacing sets. More precisely, up to 3 joints, the reduction rate in the 5 cm spacing set was more than that in the other set. Nonetheles, after the third joint, the decreasing rate in the 2 cm spacing set became greater. Generally, the shorter spacing had a more reduction (attenuation) in the P-wave velocity. In this regard, at a total of 5 joints, the reduction rate of the P-wave velocity in 2 cm spacing set was more than that in the other set.

کلیدواژه‌ها [English]

  • Rock mass
  • number of joints
  • Spacing
  • Ultrasonic waves
  • P-wave velocity
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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