زمین شناسی مهندسی

زمین شناسی مهندسی

تأثیر سیکل‌های تر-خشک و نشانۀ خمیری بر نسبت باربری کالیفرنیای رس‌های تثبیت شده با آهک

نویسندگان
دانشگاه بین‌المللی امام خمینی(ره)، قزوین
چکیده
هدف از این تحقیق ارائۀ بررسی آزمایشگاهی و عددی روی تأثیر سیکل‌های تر و خشک و نشانۀ خمیری بر نسبت باربری کالیفرنیای خاک‌های رسی تثبیت شده با آهک است. تحلیل عددی براساس روش اجزا محدود به‌منظور مقایسه بین نتایج بررسی عددی و آزمایشگاهی انجام می‌شود. سه خاک رس با نشانه‌های خمیری مختلف با مقادیر مختلف آهک مخلوط و در مقدار رطوبت بهینه متراکم شدند. آزمایش CBR روی خاک‌های اصلی و خاک‌های مخلوط پس از گذشت زمان عمل‌آوری مشخص و تعداد سیکل‌های مختلف تر و خشک، انجام شد. نتایج آزمایشگاهی نشان می‌دهند که افزودن آهک به خاک تا 4% باعث افزایش چشم‌گیری در مقادیر CBR می‌شود. بر این اساس، مقادیر CBR در هر سیکل تر و خشک در حین مرحلۀ تر کاهش و در حین مرحلۀ خشک افزایش می‌یابد و پس از 3 سیکل مقادیر CBR خاک رسی تثبیت شده با آهک افزایش می‌یابد. مقایسۀ نتایج تحلیل‌های آزمایشگاهی و عددی تطابق خوبی داشته است.
کلیدواژه‌ها

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