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تأثیر اختلاط نانورس و خاکستر ساقه نی (Phragmites australis (Cav.) Trin. ex Steud) در تثبیت بستر خاکی ریزدانه راههای جنگلی | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 4، دوره 26، شماره 3 - شماره پیاپی 73، مهر 1397، صفحه 319-330 اصل مقاله (320.81 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2018.117736 | ||
| نویسندگان | ||
| آیدین پارساخو* 1؛ ایوب رضایی مطلق2 | ||
| 1استادیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| 2کارشناس ارشد جنگلداری، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| چکیده | ||
| DOR: 98.1000/1735-0883.1397.26.319.73.3.1578.1610 امروزه استفاده تلفیقی از تثبیتکننده های زیستی خاک مانند انواع خاکسترها و نانوذرات برای تسریع و تقویت فرآیند تثبیت بستر خاکی تورمپذیر راهها بیش از پیش مورد توجه قرار گرفته است. خاک رس تورمپذیر مورد استفاده در این پژوهش از مسیر عبور جادههای پیشنهادی سری دو طرح جنگلداری دکتر بهرامنیا واقع در استان گلستان تهیه شد. برای آمادهسازی تیمارهای تثبیت خاک، ابتدا درصدهای وزنی اختلاط 0/5 نانورس مونتمریلونیت و دو خاکستر ساقه نی (Phragmites australis (Cav.) Trin. ex Steud)، یک نانورس و چهار خاکستر، 1/5 نانورس و شش خاکستر و دو نانورس و هشت خاکستر به خاک اضافه شد و به مدت پنج دقیقه هم زده شد تا مخلوط همگن و عاری از کلوخه بهدست آید. پس از عملآوری و گذشت هفت، 14 و 28 روز از زمان تثبیت، آزمایشهای حدود آتربرگ، تراکم استاندارد، مقاومت تکمحوری و ظرفیت بارگذاری کالیفرنیا (CBR) در چهار تکرار در مورد مخلوطهای خاک و نمونه شاهد انجام شد. نتایج نشان داد که افزودن ترکیبات مختلف خاکستر نی و نانورس به خاک سبب کاهش حد روانی، افزایش حد خمیری و کاهش شاخص خمیری خاک شد. همچنین، با افزایش درصد وزنی مواد افزودنی مذکور، رطوبت بهینه افزایش یافت و حداکثر تراکم خشک خاک کم شد. مقاومت فشاری نامحدود و CBR خاک تا تیمار شش درصد خاکستر و 1/5 درصد نانورس بهطور قابل ملاحظهای افزایش یافت، اما افزودن مقادیر بیشتر خاکستر و نانورس، تغییرات محسوسی در مقاومت خاک ایجاد نکرد. در این پژوهش، افزایش زمان عملآوری سبب کاهش شاخص خمیری، افزایش حداکثر تراکم خشک و مقاومت خاک شد. به این ترتیب، تیمار شش درصد خاکستر و 1/5 درصد نانورس با زمان عملآوری 28 روز برای تثبیت خاک رس منطقه مورد مطالعه پیشنهاد میشود. | ||
| کلیدواژهها | ||
| تثبیت خاک؛ جادههای پیشنهادی؛ رس تورمپذیر؛ زمان عملآوری؛ مونتمریلونیت | ||
| عنوان مقاله [English] | ||
| Investigating the effect of the combination of nano-clay and reed ash (Phragmites australis (Cav.) Trin. ex Steud.) on stabilization of the fine aggregate earthy bed of forest roads | ||
| نویسندگان [English] | ||
| Aidin Parsakhou1؛ Ayyoub Rezaee Motlaq2 | ||
| 1Assistant Prof., Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran | ||
| 2M.Sc. Forestry, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran | ||
| چکیده [English] | ||
| Today, the use of the biological stabilizers of soil such as ashes and nano-particles has been concerned to accelerate and improve the stabilizing process of the swelling soil of road bed. In this study the swell soil was brought from the routes of recommended forest road in district two of Bahramnia forest management plan in Golestan province according to the appearance and performance properties of soil. At first, for preparing the soil stabilization treatments the mixtures of 0.5% montmorillonite nano clay and 2% reed ash (Phragmites australis (Cav.) Trin. ex Steud.), 1% nano clay and 4% ash, 1.5% nano clay and 6% ash and 2% nano clay and 8% ash were added to soil and then mixed for 5 minute to access homogenous mixture without lump. After the curing time of 7, 14 and 28 days from the stabilization time, the Atterberg limit, standard proctor, unconfined compressive strength and Californian bearing ratio tests were done for 4 replications on mixtures of soil and control sample. Results showed that adding reed ash and nano clay increased the plastic limit and decreased the liquid limit and plastic index. Moreover, with increasing the amount of additive materials in the soil, the maximum dry density of the mixture decreased and optimum moisture content increased. The CBR and unconfined compressive strength of the mixture increased considerably until adding 1.5% nano clay and 6% ash and then adding more additive materials didn’t change the soil strength. In this study increasing the curing time, caused that the maximum dry density and soil strength to increase, whereas the plastic index of the mixture decrease. So, the optimal treatment of 1.5% nano clay and 6% ash and curing time of 28 day is recommended for stabilization of clay soil in study area. | ||
| کلیدواژهها [English] | ||
| Curing time, Montmorillonite, recommended roads, soil stabilization, swelling clay | ||
| مراجع | ||
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