fa بررسی خصوصیات زمین‌شناسی مهندسی پریدوتیت‌ها(مطالعۀ موردی: شهرستان هرسین، استان کرمانشاه) زمین شناسی مهندسی Engineering Geology مقاله پژوهشی Original Research <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">بخش اعظم شرق و جنوب شرق استان کرمانشاه از رخنمون پریدوتیت‌ها تشکیل‌شده است. شناخت ویژگی‌های زمین‌شناسی مهندسی پریدوتیت‌های هرسین به شناخت عمومی زمین‌شناسی مهندسی </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">محل </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">کمک زیادی می‌کند. هدف این مقاله بررسی و معرفی خصوصیات زمین‌شناسی مهندسی پریدوتیت‌های هرسین </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">استان کرمانشاه است.</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">در این پژوهش، به‌منظور شناخت خصوصیات و رفتار مهندسی این سنگ‌ها، ۱۵ بلوک از پریدوتیت‌های هرسین انتخاب شد و برای انجام آزمایش‌های آزمایشگاهی به آزمایشگاه انتقال داده شد. خصوصیات سنگ‌‌شناسی، ویژگی‌های فیزیکی و مکانیکی پریدوتیت‌ها تعیین ‌شده است. نمونه‌ها تحت آزمایش‌های سختی چکش ‌اشمیت، دوام وارفتگی، شاخص بار نقطه‌ای، مقاومت فشاری تک‌محوری</span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">،</span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;"> مقاومت کشش برزیلی و سرعت موج قرار گرفته‌اند. نتایج این تحقیق نشان داد که تفاوت در خصوصیات سنگ‌شناسی و فیزیکی منجر به تغییر در خصوصیات مکانیکی آن‌ها شده است. با استفاده از آنالیزهای رگرسیون نرم‌افزار</span></span></span> <span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">Excell</span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">، ارتباط بین خصوصیات </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">فیزیکی و مکانیکی پریدوتیت‌ها تعیین شد. </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">بر اساس نتایج به‌دست ‌آمده، میزان انطباق بیش</span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">‌</span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">تری بین نتایج خصوصیات مکانیکی در حالت خشک نسبت به اشباع وجود دارد.</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">بیش‌ترین</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">انطباق</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">بین</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">آزمایش مقاومت </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">کششی برزیلی</span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">(</span></span></span><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">BTS</span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">) </span></span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">با </span></span></span>&nbsp;<span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">سختی ‌اشمیت</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">(</span></span></span><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">SHV</span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">) در حالت خشک</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">است که</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">میزان</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">ضریب تعیین(</span></span></span><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">r²</span></span><span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">)</span></span></span> <span dir="RTL"><span style="font-family:B Lotus;"><span style="font-size:10.0pt;">برابر ۰/۹۵ است</span></span></span> Because of the diversity in petrography, peridotites have variable physical and mechanical properties. For this reason, knowledge of resistance properties and their deformation will help with the prediction of engineering behavior of these rocks. Due to the large spread of igneous rocks, especially peridotite, in Zagros, northeastern and central Iran, special attention has been paid to their petrographic, physical and mechanical characteristics. The construction of the structure within or on the peridotites and the choice for the purpose of the stone borrow depends on the recognition of its engineering geology characteristics. In this paper, in addition to the field and laboratory study, the geological characteristics of peridotite engineering has been investigated.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br> <strong>Material and methods&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </strong><br> In order to study the geological characteristics of the peridotites of Harsin region, 15 suitable blocks were selected and transferred to the laboratory. Accordingly, from collected rock samples, 150 cylindrical cores of diameter 54 mm were prepared and physical and mechanical tests were performed according to (ISRM, 2007) and (ASTM, 2001) guidelines. In this research, after sampling of the study area and preparing the core for the lithological characteristics of the samples by providing thin sections of them with polarizing microscopy was studied.<br> <strong>Results and discussion</strong><br> By considering the results of laboratory tests and analysis from Harsin peridotites in Kermanshah province, we can acclaim that with increasing the percentage of minerals in olivine and pyroxene in rock, the strength was decreased and the levels weaknesses, which is due to the weak structure of the mineral-olivine and pyroxene. According to the physical properties test and Anon classification, the porosity percentage in porosity percentage is low and as a result the amount of water absorption index is low. Based on the Gamble classification, all peridotites are very resistant to durability and based on the Franklin and Chandra classification, all samples are extremely resistant. The results of this study showed that the single axial compressive strength, elasticity modulus, point load index and tensile strength were decreased with an increase in humidity content of peridotite samples. This is due to the fact that with the increase of humidity pore pressure of water increases. According to the Anon classification, the peridotites are very high in terms of the length of the longitudinal passage through the rock. The highest compliance between the Brazilian Tensile strength test (BTS) and Schmidt hammer (SHV) was achieved in the dry condition and the determination coefficient (R²) equals to 0.95 was obtained. Also there is an acceptable relation between the Brazilian Tensile Strength Test (BTS) and the dry volume unit weight (&gamma;_d) with the determination coefficient (R²) of 0.93. In addition, there is an admissible relationship between durability test and single-axial compressive strength, with a coefficient determination (R²) of 0.94. Regarding the obtained regressions in this study, the physical and mechanical properties show good agreement and most of the equations have an acceptable coefficient determination. خصوصیات سنگ‌شناسی, خصوصیات فیزیکی, خصوصیات مکانیکی, پریدوتیت, هرسین lithology properties, physical properties, mechanical properties, peridotite, Harsin 105 132 http://jeg.khu.ac.ir/browse.php?a_code=A-10-1655-2&slc_lang=fa&sid=1 Mohammad Hossein Ghobadi محمد حسین قبادی - 10031947532846004257 10031947532846004257 No دانشگاه بوعلی سینا، دانشکدۀ علوم پایه Mehrdad Amiri مهرداد امیری a.mehrdad1372@yahoo.com 10031947532846004258 10031947532846004258 Yes دانشگاه بوعلی سینا، دانشکدۀ علوم پایه Farhad Aliani فرهاد آلیانی - 10031947532846004259 10031947532846004259 No دانشگاه بوعلی سینا، دانشکدۀ علوم پایه