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مطالعه آزمایشگاهی و عددی خرابی در سنگ گرانیتی با استفاده از تانسور ترک مرتبه دوم | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 3، دوره 51، شماره 3، مرداد و شهریور 1398، صفحه 415-424 اصل مقاله (1.16 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2017.13575.5441 | ||
| نویسندگان | ||
| کامران پناغی؛ علی اکبر گلشنی* | ||
| دانشگاه تربیت مدرس | ||
| چکیده | ||
| یکــی از رویکردهــای مــورد اســتفاده در بررســی اثــرات تــرک بــر رفتــار محیــط ناپیوســته ســنگی، مطالعــه بــر روی محیـط پیوسـته معـادل محیـط ترک خـورده میباشـد. از جملـه ایـن روش هـا، روش مبتنـی بـر تانسـور تـرک اسـت کـه اثـرات هندســی حضــور ترک هــا شــامل انــدازه، امتــداد، و چگالــی عــددی آنهــا را در بــر می گیــرد. نوشــته حاضــر بــه رویکــرد جدیــد تعییـن تانسـور تـرک از مرتبـه دوم بـا اسـتفاده از آزمایشـات تعییـن سـرعت مـوج طولـی در محیـط پرداختـه و نیـز بـر نقـش آن در تسـهیل بررسـیها به عنـوان یـک رویکـرد جایگزیـن بـرای برداشـت های صحرایـی و نیـز مدل سـازی های عـددی کارا تا کیــد دارد. ماتریس هــای ســاختاری به دســت آمده در نوشــتار حاضــر امــکان بررســی رفتــار محیــط ناپیوســته ســنگی را بــا اسـتفاده از مدل سـازی عـددی بـر پایـه روش المـان محـدود در محیـط Matlab فراهـم سـاختند کـه نتایـج آن از تطابـق قابـل قبولـی بـا داده هـای آزمایشـگاه برخـوردار بـود. بدیهـی اسـت کـه بهبـود دقـت محاسـبات از طریـق افزایـش تعـداد نمونه هـای آزمایشــگاهی و به کارگیــری نتایــج حاصــل در برنامــه کامپیوتــری امکانپذیــر می باشــد. | ||
| کلیدواژه‌ها | ||
| روش المان محدود؛ آزمایش تعیین سرعت موج طولی؛ تانسور ترک؛ سنگ گرانیتی؛ Matlab | ||
| موضوعات | ||
| مکانیک سنگ و شیروانی های سنگی | ||
| عنوان مقاله [English] | ||
| Experimental and FEM Study on Damaged Granitic Rock Using Second Rank Crack Tensor | ||
| نویسندگان [English] | ||
| Kamran Panaghi؛ ali akbar golshani | ||
| Tarbiat Modares University | ||
| چکیده [English] | ||
| Any investigative approach towards rock behavior will necessitate inherent deficiencies such as pores and cracks to be taken into consideration. One of the methodologies employed to study cracked rock is to consider an equivalent continuum as for the domain with defects which will lend flexibility to experimental and numerical schemes due to its seamless effects on the constitutive relationships, hence reducing computational costs as well as experimental restraints in the laboratory. A case in point in such approach is the crack tensor model which is based upon the idea to represent cracks’ size, orientation, and number density as one single entity through which proper geometric characterization of the in-situ rock is carried out. Following the introduction of crack tensor concept and its application in the technical literature, the current work focuses on the determination of second rank crack tensor using P-wave velocity measurements on damaged granite. The benefit of such approach is emphasized via its role in boosting the degree of accuracy of the numerical analysis code developed in Matlab that implements different compliance matrices for four different stages of loading. The calculation results showed promising trends in agreement with those of the experimental data. Apparently, more experimental procedure is required to improve results’ accuracy in projects for which fulfilling more stringent regulatory requirements is a must. | ||
| کلیدواژه‌ها [English] | ||
| finite element method, P-wave velocity measurement, Crack tensor؛ Granitic rock؛ Matlab | ||
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| مراجع | ||
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