تأثیر شوری آب منفذی و ماسه بادی بر مقاومت تک محوری و مدول الاستیسیته خاکهای رسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد سازه‌های آبی، گروه مهندسی آب، دانشگاه کشاورزی و منابع طبیعی خوزستان، اهواز ایران.

2 استادیار گروه مهندسی آب، دانشکده مهندسی زراعی و عمران روستایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، خوزستان، ایران.

3 استادیار گروه سازه‌های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران

4 استادیار گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان

5 استادیار گروه علوم و مهندسی مهندسی خاک، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، اهواز ایران.

چکیده

ساخت بستر مناسب برای سازه­های آبی مثل کانال­ها، طول عمر مفید آن­ها را افزایش می­دهد. از جمله عوامل موثر در این موضوع، شرایط مقاومتی خاک است. ترکیبات شیمیایی موجود در خاک مقاومت آن را تحت تاثیر قرار داده و در نتیجه میزان باربری آن را دچار تغییر می­کند. سدیم و کلسیم از جمله مهمترین کاتیون­های موجود در منابع آب و خاک هستند. در سالیان اخیر، به دلیل صرفه اقتصادی و سازگاری با محیط زیست، استفاده از ماسه بادی به عنوان ماده افزودنی برای اصلاح خاک گسترش یافته است. در این تحقیق تاثیر دو نمک کلرید سدیم و کلرید کلسیم و همچنین ماسه بادی، به عنوان ماده افزودنی، بر خصوصیات مقاومتی خاک رسی مورد بررسی قرار گرفته­است. در این راستا، هر دو نمک­ و ماسه بادی در چهار سطح مختلف (به ترتیب 0، 5، 10 و 20  و صفر، 5، 10 و 15 درصد وزنی خاک خشک) به خاک افزوده و نمونه­هایی تهیه شد. پس از عمل­آوری در دو دوره 7 و 28 روزه، نمونه­ها تحت آزمایش مقاومت فشاری تک محوری قرار گرفتند. نتایج نشان داد که افزایش کلرید سدیم موجب کاهش خصوصیات مقاومتی خاک می­شود و افزودن ماسه تاثیری بر روند کاهشی آن ندارد. همچنین، افزودن 5 درصد ماسه بادی و 5 درصد کلرید کلسیم موجب حصول حداکثر مقاومت فشاری و مدول الاستیسیته در خاک می­شود. بر اساس نتایج به­دست آمده، افزودن کلرید کلسیم مقاومت خاک را به اندازه افزودنی­های شیمیایی دیگر مانند آهک افزایش نمی­دهد. اما، موجب بهبود نسبی آن می­شود. همچنین، برای بهبود مقاومت خاک­های دارای مقادیر زیاد سدیم، آبشویی آن­ها قبل از ساخت بستر سازه به عنوان راهکار مناسب توصیه می­شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Pore Water Salinity and Fine Sand on Unconfined Strength and Elasticity Module of Clay Soils

نویسندگان [English]

  • Sara Samimnia 1
  • Amir Naserin 2
  • mehdi Daryaee 3
  • Ahmad Jafari 4
  • Mohammad Reza Ansari 5
1 Former M.Sc. Student of water structure, Department of Water Engineering Department, Agricultural Sciences and Natural Resources University of Khuzestan, Ahvaz, Iran
2 Assistant Professor, Department of Water Engineering, Faculty of Agricultural Engineering and Rural Development, Agricultural Sciences and Natural Resources University of Khuzestan, Iran.
3 Assistant professor, Department of hydraulic structures, Faculty of water sciences engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
4 Assistant Professor, Department of Water engneering, Agricultural Sciences and Natural Resources University of Khuzestan, Iran.
5 Assistant professor, Department of Soil ُSciences and Engineering, Agricultural Sciences and Natural Resources University of Khuzestan, Ahvaz, Iran
چکیده [English]

Construction of proper foundation for water structures such as canals increases their long life. One of the effective factors in this issue is soil strength condition. Chemical compounds of the soil affect its strength and change its bearing capacity. Sodium and Calcium are the most important cations in the soil and water resources. In recent years, because of its environmental compatibility and economic advantages, fine sand has been used widely as an additive amendment for soil remediation. In this research, the effect of calcium chloride and sodium chloride as well as fine sand, as additive material, on the strength characteristics of clay soil have been investigated. In this regard, the additive materials (salt and sand) were added to the clay soil at four different levels (0, 5, 10, 20 and 0, 5, 10, 15 percent of the soil dry weight, respectively) and specimens were provided by static compaction method. The specimens were subjected to an unconfined compressive strength test after two curing times of 7 and 28 days.  The results showed increasing sodium chloride decreases the strength characteristics of the soil and adding fine sand does not have any significant effect on this trend. Also, adding 5 percent sand and calcium chloride to the clay soil caused to obtain maximum unconfined compressive strength and elasticity module of it. On the base of the results, adding calcium chloride improve soil strength relatively but not as much as other common additives, such as lime. Moreover, for increasing the strength of soils with large amounts of sodium chloride, soil leaching is suggested as a proper solution before foundation construction of the structures.

کلیدواژه‌ها [English]

  • Irrigation Canal
  • Soil Stabilization
  • Sodium Chloride
  • Calcium Chloride
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