بررسی قابلیت زهکشی سنگ‌دانه‌های خرد شده بالاست ترکیب شده با خرده لاستیک

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بجنورد، بجنورد، خراسان شمالی، ایران

چکیده

اضافه نمودن خرده لاستیک بین سنگ­دانه­ های بالاست یک روش مناسب برای کاهش میزان خردشدگی سنگ­دانه­ های بالاست است. با وجود این، عدم قطعیت­ هایی در ارتباط با زهکشی مناسب لایه دانه ­ای بدست آمده به ویژه در صورت وقوع خردشدگی قابل ­ملاحظه، وجود دارد. در این مطالعه، تراوایی مصالح بالاست که دچار خردشدگی گردیده ­اند و در آن اندازه ­ها و مقدارهای مختلفی از ذرات خرده لاستیک اضافه شده است، بررسی می ­شود. برای تهیه مصالح خرد شده بالاست، آزمایش بارگذاری ضربه تحت شرایط کنترل شده روی سنگ­دانه ­های دست نخورده انجام می ­شود. سپس، آزمایش نفوذپذیری با ارتفاع ثابت، روی مخلوط بدست آمده از ترکیب سنگ­دانه خرد شده بالاست و خرده لاستیک صورت می­ گیرد. نتایج بدست آمده نشان می­ دهند که اثر اندازه ذرات خرده لاستیک در مقایسه با مقدار درصد مورد استفاده، روی ضریب هدایت هیدرولیکی مخلوط بدست آمده بیشتر است، به نحوی­ که تا 45% باعث کاهش ضریب هدایت هیدرولیکی می­ شود. همچنین، هنگامی ­که ذرات ریزتر خرده لاستیک با بالاست دارای خردشدگی بالا ترکیب می­ شود، نتایج آزمایش نفوذپذیری روی مخلوط دانه ­ای بدست آمده تایید می­ کند که خط برازش داده شده روی تغییرات گرادیان هیدرولیکی اعمالی با سرعت جریان آب از حالت غیرخطی به سمت حالت خطی رایج میل می­ کند که تحت عنوان قانون دارسی شناخته می­ شود. مطابق انتظار، وقوع درصد بالاتر خردشدگی در سنگ­دانه­ های بالاست باعث آلودگی این مصالح و در نتیجه افت ضریب هدایت هیدرولیکی می­ گردد، با این وجود میزان نفوذپذیری حتی برای نمونه­ های با میزان خردشدگی قابل ­ملاحظه و ترکیب شده با ذرات ریز خرده لاستیک، بالاتر از حداقل مشخص شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Drainage capability of degraded ballast aggregate mixed with discarded granulated rubber particles

نویسندگان [English]

  • Mehdi Koohmishi
  • Ali Reza Azarhoosh
Department of Civil Engineering, Faculty of Engineering, University of Bojnord, Bojnord, North Khorasan, Iran
چکیده [English]

The incorporation of crumb rubber (CR) among ballast aggregate is characterized as an advantageous way to considerably lessen the degradation rate of granular particles. Meanwhile, there is uncertainty about the proper drainage performance of the mixture whenever the ballast aggregate is further degraded. The present study evaluates the drainage capability of degraded ballast aggregate in which disparate percentages and sizes of discarded granulated rubber particles are incorporated. To provide degraded aggregate, the impact loading test under controlled conditions is implemented on fresh railway ballast. Afterward, the large-scale constant head permeability test is carried out on prepared mixtures of degraded aggregate and CR particles. The results confirm that the effect of CR size on the drainage potential of degraded ballast combined with discarded CR particles is more than the influence of CR percentage. Also, the nonlinear trend line observed between the applied hydraulic gradient and the water flow velocity approaches the conventional linear trend line represented by Darcy’s law whenever the smaller-sized CR particles are incorporated into the most degraded ballast aggregate. As expected, a higher level of degradation of aggregate decreases the hydraulic conductivity of ballast specimens, meanwhile, the permeability is yet considerably more than the acceptable limit even for specimens subjected to the significant level of degradation combined with the smaller-sized crumb rubber particles.

کلیدواژه‌ها [English]

  • Railway ballast
  • Degradation
  • Impact loading
  • Granulated rubber
  • Permeability

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 5
مرداد 1402
صفحه 1021-1038

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