محاسبه پارامترهای موج الکترومغناطیس ناشی از سنگ‌های آذرین تحت‌فشار

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه فیزیک، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

چکیده

بررسی خواص الکتریکی سنگ‌های تحت‌فشار دارای اهمیت خاصی است. بررسی این خواص، به دلیل ایجاد امواج الکترومغناطیس در اثر اعمال تنش فشاری بر سنگ‌ها، امکان هشدار اولیه در صورت ریزش معادن و تونل‌ها، کاهش آسیب‌های جانی و غیره را فراهم می‌کند. برای این منظور ما با اعمال تنش فشاری بر سنگ‌های آذرینی مثل گابرو و گرانیت، به بررسی تغییرات پارامترهای الکتریکی نمونه‌ها می‌پردازیم. اعمال تنش فشاری توسط دستگاه فشار هیدرولیک باعث ایجاد فرآیندهای فیزیکی و شیمیایی در نمونه‌ها می‌شود و زوج الکترون-حفره تولید می‌گردد. درنتیجه، شارش جریان الکتریکی و اختلاف‌پتانسیل بین حجم مرکزی سنگ تحت‌فشار و لبه‌های بدون فشار را در پی خواهد داشت. تنش فشاری بر نمونه‌ها به‌طور یکنواخت افزایش و سپس ثابت و در ادامه نیز به‌طور یکنواخت کاهش می‌یابد. با اندازه‌گیری تغییرات جریان برحسب فشار در طول زمان اعمال تنش فشاری، معادلات جریان الکتریکی، اختلاف‌پتانسیل الکتریکی سطحی نمونه و همچنین میدان‌های الکتریکی و مغناطیسی حاصل از تغییرات فشار بر نمونه را به دست می‌آوریم و نشان می‌دهیم عامل اصلی به وجود آورنده امواج الکترومغناطیس، حفره‌های با بار مثبت هستند که در اثر شکستن پیوندهای پراکسی سنگ ایجاد می‌شوند. نتایج این مقاله علاوه بر تصحیح و تکمیل آزمایش‌های قبلی، می‌تواند به‌عنوان روشی برای تشخیص تغییرات فشار مکان‌های تحت‌فشار مثل دیوارها و سقف معادن و ساختمان‌ها و نیز تغییرات فشار لایه‌های تکتونیکی زمین‌لرزه با استفاده از بررسی تغییرات پتانسیل سطحی بکار رود و می‌تواند روشی با دقت بالا در پیش‌نشانگری زلزله باشد؛ بنابراین این تحقیق برای بسیاری از محققان رشته‌های فیزیک، زمین‌شناسی، مهندسی معدن و غیره می‌تواند مفید واقع شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Calculation of electromagnetic wave parameters of igneous rocks under pressure

نویسندگان [English]

  • Mohammad Mir
  • Babak Haghighi
  • Rohollah Taghavi Mendi
  • Iman Motie
Dept. of Physics, Mashhad Branch, Islamic Azad University, Mashhad, Iran
چکیده [English]

Summary
Investigating the electrical properties of rocks under pressure is particularly important. Studying these properties, due to the creation of electromagnetic waves as a result of applying pressure on rocks, provides the possibility of early warning in case of the collapse of mines and tunnels, reducing human injuries, etc.
 
Introduction
By applying pressure to igneous rocks such as gabbro and granite, the variation of electrical parameters of the related samples is investigated. Applying pressure by using a hydraulic pressure device triggers a chemical and physical process in the samples in which electron-hole pairs are created. By measuring the time-dependent current variations in terms of pressure, electric current equations, the surface electric potential difference of the sample, as well as the electric and magnetic fields are obtained.

Methodology and Approaches
The pressure on the samples is increased uniformly, and then it is applied in a constant behavior and thus decreases uniformly. By applying pressure on the Gabbro stone under pressure, the electric current function of the sample was calculated. Finally, the equations of the electric and magnetic fields were obtained.

Results and Conclusions
It is shown that the electromagnetic waves are due to the positively charged holes created by breaking the peroxy bonds in the rock. The results of this paper can be used as a method to detect pressure variation for under-pressure systems, such as walls and roofs of mines and buildings, as well as a pressure variation in earthquake tectonic layers. It can also be a method with high accuracy in earthquake prediction.

کلیدواژه‌ها [English]

  • gabbro
  • igneous rocks
  • electric current
  • surface electric potential difference
  • time-varying electric field
  • time-varying magnetic field

مراجع

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  • تاریخ دریافت: 08 آذر 1401
  • تاریخ بازنگری: 03 بهمن 1401
  • تاریخ پذیرش: 20 بهمن 1401

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