مطالعه تأثیر ضخامت و دانه‌بندی لایه اساس مسلح‌ شده با ژئوسنتتیک‌ها بر مقادیر CBR سیستم روسازی سه‌لایه

نوع مقاله : مقاله پژوهشی

نویسندگان

آرش محمودی ¹

سجاد قلی پور ²

مسعود مکارچیان ³

¹ دانشکده مهندسی، دانشگاه بوعلی‌سینا، همدان

² گروه مهندسی عمران، دانشکده فنی و مهندسی خوی، دانشگاه صنعتی ارومیه، ارومیه، ایران

³ گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بوعلی‌سینا، همدان

10.22067/jfcei.2025.92220.1345

چکیده

استفاده از ژئوسنتتیک‌ها در تسلیح خاک برای افزایش ظرفیت باربری، کاهش نشست و جلوگیری از ترک‌های روسازی، جایگزین مؤثر برای روش‌های سنتی مانند استفاده از سیمان، آهک و سایر افزودنی ها است. در این پژوهش، با انجام آزمایش‌های CBR اصلاح شده روی نمونه‌های خاک مسلح شده با 3 نوع ژئوسنتتیک، تأثیر پارامترهای مختلف مورد بررسی قرار گرفت. لایه‌های روسازی شامل: رویه (مخلوط شن و ماسه)، زیراساس (رس با ضخامت ثابت) و اساس (دو نوع ماسه با ضخامت‌های 3، 6 و 9 سانتی‌متر دارای دو نوع دانه‌بندی) بود. نتایج آزمایش ها و تحلیل های انجام گرفته نشان داد که قرار دادن ژئوسنتتیک‌ها در مرز لایه‌ها، به‌ویژه ژئوکامپوزیت، ظرفیت باربری را بین 1.2 تا 4.5 برابر حالت غیرمسلح افزایش می‌دهد. همچنین، با افزایش ضخامت لایه اساس و اندازه دانه‌ها، ظرفیت باربری بالاتر می‌رود، اما تأثیر ژئوسنتتیک‌ها در مرز بین لایه‌ها کاهش می‌یابد. این یافته‌ها نقش مهم ژئوسنتتیک‌ها در بهینه‌سازی طراحی روسازی را تایید می‌کند.

کلیدواژه‌ها

ژئوسنتتیک

نسبت باربری کالیفرنیا (CBR)

ظرفیت باربری

تسلیح لایه اساس

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عنوان مقاله English

Study on the Effect of Thickness and Gradation of Geosynthetic-Reinforced Base Layer on CBR Values of a Three-Layer Pavement System

نویسندگان English

Arash mahmmodi ¹

sajjad gholipour ²

masoud makarchian ³

¹ Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

² Engineering Faculty of Khoy, Urmia University of Technology, Urmia

³ Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

چکیده English

ABSTRACT: The use of geosynthetics in soil reinforcement for increasing load-bearing capacity, reducing settlement, and preventing pavement cracking is an effective alternative to conventional methods such as the use of cement and lime. In this study, modified CBR tests were conducted on soil samples reinforced with three types of geosynthetics to investigate the effects of various parameters. The pavement layers included: the surface (a sand and gravel mixture), the subgrade layer (clay with a fixed thickness), and the base layer (two types of sand with thicknesses of 3, 6, and 9 cm and two different gradations). The results showed that placing geosynthetics at the interfaces between layers, especially geocomposites, increased the load-bearing capacity by a factor of 1.2 to 4.5 times compared to the unreinforced condition. Additionally, as the base course thickness and particle size increased, the load-bearing capacity improved; however, the effectiveness of the geosynthetics at the layer interfaces decreased. These findings confirm the important role of geosynthetics in optimizing pavement design.

کلیدواژه‌ها English

Geosynthetic

CBR

Bearing Capacity

Reinforcement of Base Layer

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