ارتباط بین ریزساختار با خواص فیزیکی و مهندسی ماسه‌سنگ‌ها، با تاکید بر درصد کانی کوارتز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی

2 دانشگاه زنجان گروه عمران

3 استادیار، دانشکده علوم گروه زمین‌شناسی، دانشگاه زنجان، زنجان، ایران

چکیده

ترکیب، بافت و ریزساختار سنگ‌ها بر روی ویژگی‌های فیزیکی و مکانیکی آنها، مانند وزن مخصوص، سرعت موج فشاری و موج برشی و مقاومت کششی و فشاری آنها مؤثر هستند. یکی از پارامترهای مهم در بخش ریزساختار سنگ‌ها، درصد کانی کوارتز می‌باشد. در این پژوهش، هدف بررسی تأثیر ویژگی‌های کانی‌شناسی ماسه سنگ‌ها بالاخص درصد کانی کوارتز بر روی خواص فیزیکی و مکانیکی سه گروه ماسه‌سنگ با میانگین درصد کوارتز کم )کمتر از 65 درصد(، متوسط )مابین 65 تا 80 درصد( و بالا )بیشتر از 80 درصد( می‌باشد. تعداد 26 نمونه از جنوب استان زنجان جمع‌آوری و طی برنامه‌ی جامعی از آزمون‌های مکانیک سنگی، ویژگی‌های کانی‌شناسی و پارامترهای مهندسی مانند وزن مخصوص خشک، درصد تخلخل، سرعت موج فشاری و آزمایش کششی برزیلی تعیین و ارتباط آنها با استفاده از آنالیز رگرسیون تک متغیره بررسی شد. نتایج نشان می‌دهد که ترکیب کانی‌شناسی بر روی ویژگی‌های مقاومتی تأثیرگذار بوده و با افزایش درصد کانی کوارتز در نمونه‌ها دو پارامتر فیزیکی وزن مخصوص خشک و سرعت موج فشاری و پارامتر مکانیکی مقاومت کششی برزیلی افزایش می‌یابند. همچنین با توجه به همبستگی مابین پارامترهای فیزیکی می‌توان سرعت موج فشاری را با تقریب مناسبی با استفاده از پارامتر تخلخل برای ماسه‌سنگ‌های مناطق مورد مطالعه پیش‌بینی نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Relation between microstructure and physical and engineering properties of sandstones with emphasis on quartz content

نویسندگان [English]

  • Ali Lakirouhani 1
  • Majid Bakhshi 2
  • Afshin Zohdi 3
1 Civil Engineering Department, Faculty of Engineering, University of Zanjan
2 Department of Civil Engineering, University of Zanjan, Zanjan, Iran
3 Assistant Professor, Department of Geology, University of Zanjan, Zanjan, Iran
چکیده [English]

The composition, texture and microstructure of rocks affect their physical and mechanical properties such as dry unit weight, porosity, p-wave velocity and Brazilian tensile strength. The aim of this study was to investigate the effect of mineralogy sandstone characteristics on physical and mechanical properties of sandstone in three groups with low mean quartz (less than 65%), moderate (65 to 80%) and high (more than 80% ) and 26 samples were collected from southern province of Zanjan city Then, a comprehensive program of rock mechanic tests are planned and mineralogical properties and engineering parameters such as dry unit weight, porosity, P-wave velocity and Brazilian tensile strength were determined and their relationship was investigated using linear regression analysis. The results show that the mineral composition is effective on the strength properties and increasing the quartz mineral content in the samples, two physical parameters of dry unit weight and P-wave velocity and a mechanical parameter Brazilian tensile strength increase. Also, due to the correlation between physical parameters, P-wave velocity can be predicted with appropriate approximation using porosity parameter for sandstone in studied regions and the results can be used in geomechanical studies.

کلیدواژه‌ها [English]

  • Sandstone
  • Mineralogical composition
  • P-wave velocity
  • Porosity
  • Brazilian tensile strength
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