بررسی تأثیر شیرابه زباله‌ بر رفتار‌های مقاومتی خاک های رسی با خاصیت خمیری زیاد و کم

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

میزان تولید زباله‌های شهری به صورت وصف نشدنی با گسترش شتابان جمعیت افزایش می‌یابد. یکی از راه‌های دفع این زباله‌ها از محیط اطراف زندگی بشر، دفن آنها است. دفن یا دپوی روباز این زباله‌ها در محیط زیست از یک طرف و بارش‌های جوی از سوی دیگر سبب ایجاد شیرابه‌ای از این زباله‌ها می‌گردد که به علت نفوذ در بین ذرات خاک تأثیراتی بر رفتارهای مکانیکی خاک‌ها دارد. در این پژوهش قصد بر آن است که با انجام آزمایش‌های تحکیم، تراکم، برش مستقیم، تعیین حدود اتربرگ و تصویربرداری با میکروسکوپ الکترونی به بررسی این تأثیرات پرداخته شود. از این رو نمونه‌های خاک با درصدهای مختلف آلودگی در قالب دستگاه ادئومتر و برش مستقیم در بازه‌های زمانی کوتاه مدت و بلندمدت پس از ساخت نمونه‌ها مورد آزمایش قرار گرفتند و با نمونه خاک غیر آلوده در فضای تخلخل-تنش و تنش برشی-جابجایی افقی، در کوتاه مدت و بلند مدت مورد مقایسه قرار گرفتند. با مشاهده گذر زمان بر روند تأثیر شیرابه روی مقاومت خاک مشاهده شد که پس از گذر زمان، درصدهای کم شیرابه در نهایت همانند درصدهای زیاد شیرابه بر روی خاک تأثیر خواهند گذاشت. از یک طرف افزایش تأثیر درصدهای زیاد بعد از گذر زمان در خاک ثابت شده و از طرف دیگر تأثیر درصدهای کم در خاک افزایش می‌یابد تا به مقادیر تأثیر درصدهای زیادتر برسد. درواقع نقطه بیشینه تأثیرات دو درصد کم و زیاد یکسان می‌گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Waste Leachate on the Strength Parameters of Clay with High and Low Plasticity

نویسندگان [English]

  • A. Ouria
  • A. Farsijani
Civil Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

The leachate may cause negative effects on the mechanical behavior of contaminated soil. The objective of this research was to study this effect through performing consolidation and shearing experiments. The samples with different pollution contents underwent direct shear and consolidation tests in bot long-term short-term conditions. The shear strength and oedometric behavior of contaminated specimens was compared with non-contaminated specimens. In order to study the effect of pollution duration, and the length of soil exposure to leachate, the experiments were conducted at certain time intervals after contaminations of specimens. The samples were kept at barred packages and then tested at the required time. The result show that permeation of leachate into the soil pores leads to decrease in shear strength and increase in settlement. The result also shows that long term exposure of specimens by leachate with low concentration shows the same results observed for specimens exposed to high concentrated leachate in a short period of time. In other words, leachate even in small concentrations have major long-term drawbacks on shear strength and compressibility of soil. Therefore, the leachate will affect the performance of structures relied on such soils.

کلیدواژه‌ها [English]

  • waste leachate
  • Shear Strength
  • Clay
  • Plasticity
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