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شبیهسازی پاسخ GPR مدلهای مصنوعی جهت شناسایی ناهمگنیهای زیرسطحی مسیر حفر تونل انتقال تاسیسات برقی اصفهان | ||
الکترومغناطیس کاربردی | ||
مقاله 6، دوره 3، شماره 1، خرداد 1394، صفحه 41-52 اصل مقاله (1.14 M) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
رضا احمدی* 1؛ نادر فتحیان پور2 | ||
1دانشگاه محل تحصیل: دانشگاه تهراندانشگاه محل کار: دانشگاه صنعتی اراک | ||
2دانشگاه صنعتی اصفهان | ||
تاریخ دریافت: 14 بهمن 1394، تاریخ بازنگری: 15 اسفند 1397، تاریخ پذیرش: 28 شهریور 1397 | ||
چکیده | ||
در مطالعه حاضر از روش رادار نفوذی به زمین (GPR) برای مقاصد مهندسی ژئوتکنیک (حفر تونل)، جهت شناسایی ناهمگنیهای زیرسطحی مسیر حفر تونل انتقال تاسیسات برقی اصفهان استفاده شده است. برای این منظور ابتدا پاسخ GPR دوبعدی مدلهای مصنوعی به شکل استوانه افقی، منشور دوبعدی مربعی و چندضلعی دلخواه متناظر با اهداف ژئوتکنیکی متداول (ساختارهایی نظیر تونلها، قناتها، انواع لولهها و کانالها)، با استفاده از برنامه مدلسازی پیشرو به روش اختلاف محدود دوبعدی بهبودیافته، شبیهسازی گردید. سپس پاسخ GPR سهبعدی مدلهای مصنوعی به شکل استوانه قائم و کره (معرف شکل عمومی فضاهای خالی)، با استفاده از نرمافزار GPRMAX3D مدلسازی شد تا در تفسیر نگاشتهای راداری واقعی GPR مورد استفاده قرارگیرند. بهمنظور آشکارسازی ناهمگنیهای زیرسطحی اعم از انواع تاسیسات مدفون، فضاهای خالی، نشستها، گسیختگیها و چاههای مدفون در راستای مسیر حفر تونل انتقال تاسیسات برقی کلانشهر اصفهان، تعداد 14 پروفیل GPR در امتداد یکدیگر بهصورت یک خط برداشت طولانی به طول کلی بیش از 1200 متر برداشت شد. برداشت دادهها توسط یک سیستم GPR پوششدار با فرکانس مرکزی 250 مگاهرتز انجام گرفت. بررسی نتایج حاصل از تفسیر نگاشتهای راداری، پس از اعمال فیلترهای مختلف حاکی از قابلیت بسیار بالای روش GPR در تعیین موقعیت و شناسایی انواع ناهمگنیهای زیرسطحی است. به منظور صحتسنجی نتایج بدست آمده، بر روی یکی از ناهمگنیهای تصویر GPR تفسیر شده به عنوان یک چاه مدفون، چال قائمی حفر شد و اعتبار نتایج به اثبات رسید. | ||
کلیدواژهها | ||
رادار نفوذی به زمین (GPR)؛ هذلولی پاسخ؛ مدلسازی عددی؛ اهداف ژئوتکنیکی؛ تونل انتقال تاسیسات برقی اصفهان؛ ناهمگنی زیرسطحی | ||
عنوان مقاله [English] | ||
Simulation of GPR response for 2-D and 3-D synthetic models for geotechnical applications, case study: detection of subsurface along Isfahan main power line tunnel | ||
چکیده [English] | ||
In this research, the GPR method has been employed to identify subsurface in-homogeneities along Isfahan main power line tunnel as an application in geotechnical engineering practices. To this goal, the GPR response of common 2D synthetic models including horizontal cylinder, 2D prism and arbitrary polygon corresponding to targets encountered in usual geotechnical practices were simulated first. To achieve this objective, an improved 2D finite difference algorithm developed for forward modeling in frequency domain, was used in MATLAB programming environment. Next, the GPR response of 3D synthetic models containing vertical cylinder and sphere (representing usual form of cavities) was produced by means of GPRMAX3D software for more detailed and realistic interpretations. To detect probable subsurface in-homogeneities including different types of manmade buried installations, subsidence and buried wells along the Isfahan main electric power line tunnel, 14 longitudinal GPR profiles covering more than 1200 meters along the tunnel axis were surveyed. The data were collected using a 250 MHz GPR system equipped with shielded antennas. The interpretation of final radargrams after applying different filters revealed that the GPR method is capable of detecting the location and type of subsurface in-homogeneities. In order to verify the performance and ability of GPR method in solving geotechnical problems encountered in real geological conditions and in particular the results obtained in current case study, a vertical borehole was drilled at one of in-homogeneities found on the radargrams which had been interpreted as a buried abandoned well. The result was in agreement with the respective interpreted radargram. | ||
کلیدواژهها [English] | ||
Ground Penetrating Radar (GPR), Hyperbolic response, Numerical modeling, Geotechnical targets, Isfahan main power line tunnel, Sub-surface in-homogeneities | ||
مراجع | ||
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