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بررسی آزمایشگاهی تأثیر تثبیت شیمیایی و زیستی بر خصوصیات خاک رس بستر راه | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 6، دوره 53، شماره 7، مهر 1400، صفحه 2821-2836 اصل مقاله (812.96 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.17493.6588 | ||
| نویسندگان | ||
| سیامک شفقتیان1؛ غلام مرادی* 2؛ هوشنگ کاتبی3 | ||
| 1گروه ژئوتکنیک دانشکده عمران دانشگاه تبریز،تبریز،ایران | ||
| 2دانشیارگروه ژئوتکنیک دانشکده عمران دانشگاه تبریز،تبریز،ایران | ||
| 3دانشیار گروه ژئوتکنیک دانشکده عمران دانشگاه تبریز،تبریز،ایران | ||
| چکیده | ||
| تثبیت شیمیایی خاک ضعیف بستر راه، یک روش مناسب و ضروری برای پرهیز از مشکلات جایگزینی خاک ضعیف با منابع منتخب قرضه به لحاظ اقتصادی و زیست‌محیطی است. در تثبیت شیمیایی، استفاده از مصالح نوین از جمله پلیمرها به جای مصالح سنتی مانند آهک موجب تسریع عملیات و همچنین کاهش فشار بر منابع میشود ولی آثار زیست‌محیطی و مقاومت درازمدت این روش‌ها دغدغه متخصصین است. اخیرا طبق توصیه پیمان زیست‌محیطی کیوتو در بخش تثبیت خاک با اهداف ژئوتکنیکی، تحقیق بر روی روش‌های نوین زیستی تثبیت خاک از جمله روش "تثبیت میکروبی خاک" گسترش یافته است. در این پژوهش تأثیر تثبیت خاک رس بستر راه به دو روش شیمیایی و زیستی از طریق آزمایشهای مختلف، بررسی و مقایسه شده است. در تثبیت شیمیایی از یک پلیمر مایع به نام پلی‌الکترولیت کاتیونی و در تثبیت زیستی، از روش رسوب میکروبی کربنات کلسیم، به عنوان یک روش به‌سازی میکروبی استفاده شده است. در هر دو روش وزن مخصوص خشک خاک، کاهش و رطوبت بهینه آن افزایش می‌یابد. تثبیت شیمیایی، دامنه خمیری را افزایش و تثبیت میکروبی آن را کاهش می‌دهد. هر دو ماده در غلظت‌های پایین، pH محیط را تا دوره زمانی سه روزه افزایش می‌دهند. هر دو ماده مقاومت فشاری تک‌محوری و مدول الاستیسیته خاک را تقریباً به یک میزان افزایش می‌دهند که به لحاظ اقتصاد پروژه (هزینه و زمان)، تثبیت شیمیایی با پلی‌الکترولیت کاتیونی و به لحاظ مسائل زیست‌محیطی، تثبیت زیستی به روش MICP برای خاک مورد مطالعه مناسب است. | ||
| کلیدواژه‌ها | ||
| تثبیت شیمیایی؛ تثبیت زیستی؛ بستر رس؛ پلی‌الکترولیت کاتیونی؛ به‌سازی میکروبی | ||
| موضوعات | ||
| تثبیت خاک رسی؛ تعمیر و تقویت زیرسازی راه؛ روش های نوین مهندسی | ||
| عنوان مقاله [English] | ||
| Experimental Study of the Effect of Chemical and Biological Stabilization on Clay Subgrade Soil | ||
| نویسندگان [English] | ||
| siamak shafaghatian1؛ gholam moradi2؛ Hooshang Katebi3 | ||
| 1Department of civil engineering-Geotechnical engineering,University of tabriz,Tabriz,Iran | ||
| 2Department of civil engineering-Geotechnical engineering,University of tabriz,Tabriz,Iran | ||
| 3Department of civil engineering-Geotechnical engineering,University of tabriz,Tabriz,Iran | ||
| چکیده [English] | ||
| Chemical stabilization of weak subgrade soil is a viable and essential method of avoiding weak soil replacement problems with selected borrow pit from an economically and environmentally point of view. Although the use of new materials such as polymers instead of traditional materials such as lime accelerates operations and reduces resource pressure, the environmental impact and long-term resistance in these methods are concerns for experts. Recently, according to the “Kyoto Environmental Protocol” recommendation on soil stabilization with geotechnical purposes, research on new biological methods of soil stabilization including "soil microbial stabilization" has been developed. In this study, the effect of clay subgrade stabilization with chemical and biological methods was investigated and compared through different experiments. Cationic polyelectrolyte as a liquid polymer and microbial-induced calcium carbonate precipitation (MICP) was used to stabilize chemically and biologically respectively. In both methods, the specific dry weight of soil decreases, and its optimum moisture content increases. Chemical stabilization increases plastic index and microbial stabilization decreases it. Both materials at low concentrations raise the pH for up to three days. Both materials increase the uniaxial compressive strength and elasticity modulus of the soil almost equally. In terms of project economy (time and cost), chemical stabilization with cationic polyelectrolyte, and terms of environmental issues, the MICP method is suitable for the studied soil. | ||
| کلیدواژه‌ها [English] | ||
| Chemical stabilization, Biological stabilization, Clay subgrade, Cationic polyelectrolyte, Microbial stabilization | ||
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| مراجع | ||
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