نوع مقاله : مقاله پژوهشی
نویسندگان
گروه زمین شناسی مهندسی، دانشکده علوم، دانشگاه تربیت مدرس، تهران، ایران
چکیده
پهنه ساختاری-رسوبی البرز مرکزی در بخش میانی رشته کوه البرز با تحمل رخدادهای زمین‌شناسی از پرکامبرین تا عهد حاضر، ساختارها و سازندهای زمین‌شناسی گوناگونی در خود جای داده است. از این میان، سازندهای ماسه‌سنگی نیز گسترش شایان توجهی دارند. در این پژوهش، از 6 سازند ماسه‌سنگی باروت، زاگون، لالون، کوارتزیت راسی، دورود و شمشک در دو محل نمونه‌برداری و تحت آزمایش‌های تعیین ویژگی‌های فیزیکی و مکانیکی قرار گرفتند. به طور کلی در سازندهای ماسه‌سنگی البرز مرکزی کوارتزیت راسی ویژگی‌های مقاومتی قوی‌تری نسبت به سایر سازندها دارد. سازند شمشک پایین‌ترین پارامترهای مکانیکی در میان سازندهای انتخاب شده را داراست. بر اساس تحلیل‌های رگرسیونی ضریب همبستگی پارامترهای شاخص بار نقطه‌ای (PLT)، برزیلین (BST) و شاخص پانچ استوانه‌ای (CPI) به مقاومت تراکمی تک محوری (UCS) به ترتیب 20/6، 6 و 20/40 با R2های 0/75، 0/9 و 0/78 نشان دادند. از نظر شاخص سرشار (CAI)، به‌عنوان شاخصی که می‌تواند میزان سایندگی را نشان دهد، کوارتزیت راسی بیشترین سایندگی را داراست که به ترکیب سنگ‌شناسی آن بر می‌گردد. این سازند ماسه‌سنگی در رده سنگ‌هایی با قابلیت سایندگی بالا قرار گرفته و سازند شمشک در بین سازندها، کمترین شاخص سرشار را دارد و در گروه سنگ‌هایی با سایندگی شدیدا پایین قرار می‌گیرد.
کلیدواژه‌ها
موضوعات
جعفری، ا.، نیکودل، م. ر.، احمدی، م.، 1389، ارزیابی ویژگی‌های مقاومتی سنگ‌ها با استفاده از نتایج آزمایش پانچ بلوکی و پانچ استوانه‌ای. مجله علوم دانشگاه تهران، جلد سی و ششم، شماره 1، ص 169-183.
آقانباتی، ع، 1383، زمین‌شناسی ایران، نشر سمر، سازمان زمین‌شناسی و اکتشافات معدنی کشور، ص 586.
درویش زاده، ع، 1383، زمین‌شناسی ایران، انتشارات امیرکبیر. ص 434.
سهندی، م. ر.، سهیلی، م.، 1392، نقشه زمین‌شناسی ایران، مقیاس 1:1000000، سازمان زمین شناسی و اکتشافات معدنی ایران.
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