بررسی تأثیر آهک بر روی خصوصیات تورمی خاک جاده‌های جنگلی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران.

2 پژوهشگاه صنعت نفت، پردیس انرژی و محیط‌زیست، تهران، ایران.

3 گروه عمران-راه و ترابری، دانشگاه آزاد اسلامی، واحد آمل، آمل، ایران.

10.22059/jfwp.2023.361990.1258

چکیده

خاک­ های متورم، خاک ­های ریزدانه ­ای هستند که حجم آن­ها در اثر جذب آب، افزایش و با از دست دادن رطوبت، کاهش می­ یابد و مشکلاتی را برای جاده‌سازی ایجاد می­ کنند. بنابراین، باید به ­دنبال بهبود خصوصیات مکانیکی این نوع خاک­ ها بود. از آنجا که آهک یک مادة ضد آب ارزان‌قیمت، در دسترس و با کاربرد آسان است، در این مطالعه تأثیر مادة آهک بر روی خصوصیات تورمی یک خاک رسی با حد روانی بالا (CH) مورد بررسی قرار گرفت. آزمایش­ های حدود آتربرگ شامل حد روانی (LL)، حد خمیری (PL)، حد انقباض (SL) و شاخص خمیری (PI)، تراکم پراکتور، تورم آزاد و فشار تورمی براساس استاندارد بر روی نمونه خاک شاهد و خاک اختلاط یافته با درصدهای مختلف آهک (3، 5 و 7 درصد) انجام شد. همچنین، به­ منظور بررسی زمان عمل‌آوری آزمایش‌های مکانیک خاک بر روی نمونه­ های عمل‌آوری شده در زمان­ های 7، 14 و 28 روزه انجام شد. نتایج نشان داد با افزودن آهک، میزان LL و PI کاهش و PL و SL افزایش یافت. همچنین افزودن آهک به خاک موجب کاهش وزن واحد خشک خاک و افزایش درصد رطوبت بهینة خاک و کاهش تورم آزاد و فشار تورمی می ­گردد و بیشترین کاهش در نمونة اختلاط‌یافته با 5 درصد آهک مشاهده شد. علاوه بر این، نتایج نشان داد با افزایش زمان عمل‌آوری تورم آزاد و فشار تورمی در نمونه ­های اختلاط‌یافته با 3 درصد آهک کاهش می­ یابد. بنابراین می­ توان نتیجه­ گیری نمود که آهک در کاهش تورم خاک­ های جنگلی موثر می ­باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the effect of lime on the swelling characteristics of forest roads

نویسندگان [English]

  • Fatemeh Mousavi 1
  • Ehsan Abdi 1
  • Zahra Mashayekhi 2
  • Morteza Modaresi 3
  • Mostafa Janatbabaei 1
1 Department of Forestry, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
2 Research Institute of Petroleum Industry, Faculty of Energy and Environment, Tehran, Iran.
3 Department of Civil Engineering, Majoring in Road and Transportation, Islamic Azad University, Amol branch, Iran
چکیده [English]

Swelling soils, characterized by fine particles, undergo volume changes due to water absorption and loss, posing challenges in road construction. Hence, enhancing the mechanical properties of such soils is crucial. Considering lime as a cost-effective, readily available, and easily applicable water-repellent material, this study investigates its influence on the swelling characteristics of high-plasticity clay soil (CH). Atterberg limit tests, including liquid limit (LL), plastic limit (PL), shrinkage limit (SL), plasticity index (PI), Proctor compaction, free swell, and swelling pressure tests were conducted based on standard procedures on control soil samples and soil samples mixed with different percentages of lime (3, 5, and 7%). Furthermore, mechanical test assessments were performed on specimens cured for 7, 14, and 28 days. The results indicated that the addition of lime decreased LL and PI while increasing PL and SL. Moreover, lime addition led to a reduction in the dry unit weight of the soil, an increase in the optimal moisture content, and a decrease in free swell and swelling pressure, with the most significant reduction observed in samples containing 5% lime. Additionally, the findings revealed that with increased curing time, free swell and swelling pressure reduced notably in samples mixed with 3% lime. In conclusion, the study demonstrates that lime can effectively improve the mechanical properties of swelling clay soils, especially crucial for road construction and soil classification purposes. Therefore, it can be concluded that lime is effective in reducing the swelling of forest soils.

کلیدواژه‌ها [English]

  • Curing time
  • Free swell
  • Swelling pressure
  • Soil classification

مراجع

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