تخمین ویژگی‌های مکانیکی ماسه‌سنگ ها با استفاده از آزمایش سرعت موج و چکش‌اشمیت

عبدی, یاسین; خانلری, غلامرضا

doi:10.22084/nfag.2018.16623.1322

تخمین ویژگی‌های مکانیکی ماسه‌سنگ ها با استفاده از آزمایش سرعت موج و چکش‌اشمیت

نویسندگان

¹ گروه زمین‌شناسی، دانشگاه لرستان، خرم‌آباد

² گروه زمین‌شناسی، دانشگاه بوعلی‌سینا، همدان

10.22084/nfag.2018.16623.1322

چکیده

مقاومت فشاری تکمحوری، مدولالاستیسیته و مقاومت کششی برزیلی از جمله ویژگیهای مهم سنگها هستند که بهطور گستردهای در مهندسی سنگ مورد استفاده قرار میگیرند. تعیین این ویژگیها در آزمایشگاه یک فرآیند زمانبر، مشکل و پرهزینه است. لذا در این مطالعه سعی شده است که روابط تجربی برای تخمین ویژگیهای مکانیکی ماسهسنگها با استفاده از سرعت سیر موج و چکشاشمیت به عنوان دو آزمایش غیرمخرب و ساده توسعه داده شود. به همین منظور تعداد 30 بلوک سنگی از نقاط مختلف سازند قرمز بالایی در غرب قم جمعآوری شده و پس از انجام عملیات مغزهگیری مورد آزمایش قرار گرفتهاند. این آزمایشها شامل تعیین سرعت موج، عدد سختی اشمیت، مقاومت فشاری تکمحوری، مدولالاستیسیته و مقاومت کششی برزیلی میباشد. با استفاده از آنالیز رگرسیون خطی، بهترین روابط تجربی بین ویژگیهای مکانیکی و سرعت موج یا عدد سختی چکشاشمیت پیشنهاد شده است. به منظور اعتبارسنجی روابط تجربی، آزمون t و F انجام شده است که نتایج صحت و اعتبار این روابط را تأیید میکند. همچنین، مقایسه بین نتایج نشان میدهد که سرعت موج در مقایسه با عدد سختی چکش اشمیت قابلیت بیشتری برای پیشبینی ویژگیهای مکانیکی ماسهسنگهای مورد مطالعه دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of mechanical properties of sandstones using P-wave velocity and Schmidt hardness

نویسندگان [English]

Y. Abdi ¹
G. R. Khanlari ²

² Bu Ali Sina University, Faculty of Sciences, Geology Department

چکیده [English]

Uniaxial compressive strength (UCS), modulus of elasticity (E) and Brazilian tensile strength (BTS) are important properties of intact rock which are used widely in rock engineering. The determination of these parameters in laboratory is difficult, expensive and time consuming. Thus, it has been attempted that the empirical equations to estimate the mechanical properties of sandstones using P-wave velocity and Schmidt hardness as two non-destructive and easy tests were developed. For this purpose, 30 rock blocks of sandstone have been collected from several parts of Upper red formation in southwestern Qom and they were tested in the laboratory. The laboratory tests include the determination of P-wave velocity and Schmidt hardness, and mechanical properties include the uniaxial compressive strength, modulus of elasticity and Brazilian tensile strength. Empirical equations have been developed for estimating the mechanical properties from P-wave velocity and Schmidt hardness using regression analysis. To check the validity of the empirical equations, t and F test were performed, which confirmed the validity of the proposed empirical equations. Moreover, the results show that P-wave velocity appears to be more reliable than the Schmidt hardness for estimating the mechanical properties.

کلیدواژه‌ها [English]

mechanical properties
P-wave velocity
Schmidt hardness
Sandstone
Regression

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