زمین شناسی مهندسی

زمین شناسی مهندسی

ارزیابی پارامترهای کشسان همسانگرد عرضی خاک‌های برجا با استفاده از ترکیب روش‌های لرزه‌نگاری انکساری و پایین‌چاهی

نویسنده
دانشگاه خوارزمی
چکیده
ارزیابی دقیق پارامترهای کشسان ناهمسانگرد در خاک‌های طبیعی برجا، از اهمیت بالایی در کاربردهای مهندسی ژئوتکنیک و زمین‌شناسی مهندسی برخوردار است. این مطالعه، یک رویکرد نوین ژئوفیزیکی صحرایی را برای اندازه‌گیری برجای این پارامترها با استفاده از مولفه‌های ناهمسانگرد سرعت امواج P و S ارائه می‌دهد. بدین منظور، با فرض همسانگردی عرضی در نهشته‌های خاکی یک ساختگاه آزمایشی، نشان داده می‌شود که می‌توان سرعت‌های انتشار امواج P و S در جهات و صفحات مختلف را از ترکیب روش‌های لرزه‌نگاری انکساری و پایین‌چاهی به‌دست آورد. مقادیر سرعت به‌دست آمده سپس با معادلات حاصل از نظریه انتشار امواج کشسان ترکیب شدند تا مقادیر پارامتر‌های کشسان در ساختگاه ارزیابی گردند. به منظور بررسی کارایی و دقت رویکرد پیشنهادی، نتایج به‌دست آمده از داده‌های لرزه‌ای با مقادیر متناظر حاصل از آزمون‌های آزمایشگاهی مقایسه شدند که انطباق مناسبی بین آنها مشاهده گردید. رویکرد ارائه شده می‌تواند به عنوان ابزاری کارآمد و قابل اعتماد برای ارزیابی برجای پارامترهای کشسان همسانگرد عرضی در رسوبات سطحی، مبتنی بر روش‌های لرزه‌ای صحرایی، مورد استفاده قرار گیرد.
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