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تأثیر شوری آب منفذی و ماسه بادی بر مقاومت تک محوری و مدول الاستیسیته خاکهای رسی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 9، دوره 51، شماره 3، خرداد 1399، صفحه 641-658 اصل مقاله (1.22 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.289980.668339 | ||
| نویسندگان | ||
| سارا صمیم نیا1؛ امیر ناصرین* 2؛ مهدی دریایی3؛ احمد جعفری4؛ محمد رضا انصاری5 | ||
| 1دانش آموخته کارشناسی ارشد سازههای آبی، گروه مهندسی آب، دانشگاه کشاورزی و منابع طبیعی خوزستان، اهواز ایران. | ||
| 2استادیار گروه مهندسی آب، دانشکده مهندسی زراعی و عمران روستایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، خوزستان، ایران. | ||
| 3استادیار گروه سازههای آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران | ||
| 4استادیار گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان | ||
| 5استادیار 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 | ||
| کانال آبیاری؛ تثبیت خاک؛ کلرید سدیم؛ کلرید کلسیم | ||
| عنوان مقاله [English] | ||
| Effect of Pore Water Salinity and Fine Sand on Unconfined Strength and Elasticity Module of Clay Soils | ||
| نویسندگان [English] | ||
| Sara Samimnia1؛ Amir Naserin2؛ mehdi Daryaee3؛ Ahmad Jafari4؛ Mohammad Reza Ansari5 | ||
| 1Former M.Sc. Student of water structure, Department of Water Engineering Department, Agricultural Sciences and Natural Resources University of Khuzestan, Ahvaz, Iran | ||
| 2Assistant Professor, Department of Water Engineering, Faculty of Agricultural Engineering and Rural Development, Agricultural Sciences and Natural Resources University of Khuzestan, Iran. | ||
| 3Assistant professor, Department of hydraulic structures, Faculty of water sciences engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran. | ||
| 4Assistant Professor, Department of Water engneering, Agricultural Sciences and Natural Resources University of Khuzestan, Iran. | ||
| 5Assistant 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 | ||
| مراجع | ||
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