ارزیابی تأثیر بهسازی به روش الکترواسمزی بر خصوصیات مکانیکی خاک رس نرم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، معماری و هنر، دانشگاه آزاد اسلامی، واحد علوم تحقیقات، تهران، ایران

2 دانشکده فنی و مهندسی، دانشگاه رازی، کرمانشاه، ایران

چکیده

یکی از انواع روش‌های بهسازی خاک، روش الکتریکی است. در اﯾﻦ روش ﺗﺜﺒﯿﺖ خاک‌های رﯾﺰداﻧﻪ، به‌‌ویژه خاک‌های رﺳﯽ اشباع‌، ﺑﺎ ﮐﺎﻫﺶ ضخامت لایه آب دوگانه از ﻃﺮﯾﻖ برقراری ﺟﺮﯾﺎن اﻟﮑﺘﺮﯾﮑﯽ اﻧﺠﺎم می‌شود. خاک رس نرم از جمله خاک‌های مسئله‌دار است، این خاک تحت تأثیر شرایط آب و هوایی قرار دارد و احداث سازه بر روی آن‌ها همواره با خطر مواجه است. در این مطالعه به‌منظور بهسازی و تثبیت خاک‌های رسی نرم از روش تزریق الکتروکینتیکی، که یکی از روش‌های تثبیت در حالت برجا بوده و از لحاظ زمان و هزینه بسیار به‌صرفه است استفاده شده است. به این منظور، در شرایط آزمایشگاهی لایه‌ای از خاک با درصد رطوبت و وزن مخصوص در محل در محفظه‌ای به ابعاد cm3 50*30*20 در پنج لایه متراکم شده و جریان مستقیم (DC) با ولتاژهای v/cm 1 و 1/5 به مدت 48 ساعت اعمال گردیده است. الکترودهای مورد استفاده از جنس آلومینیوم و گرافیت و در دو حالت میله‌ای و صفحه‌ای مورد استفاده قرار گرفتند. نتایج شاخص مطالعات نشان داد که استفاده از این روش سبب افزایش مقاومت فشاری محدود نشده از kpa 98 به  kpa 223 به میزان 128%، کاهش درصد رطوبت از 24 به 15/2 به میزان 37%، کاهش شاخص خمیری از 24 به 10 به میزان 58% و کاهش تخلخل خاک از 0/675 به 0/443 نسبت به نمونه خاک بهسازی نشده می‌شود. نتایج تحلیل شیمیایی در بررسی تصاویر میکروسکوپ الکترونی روبشی صحت نتایج فیزیکی را تایید می نماید. با توجه به آزمایش‌های درصد رطوبت، حدود اتربرگ، مقاومت فشاری محدود نشده و تحکیم مشخص گردید بهترین عملکرد مربوط به استفاده از الکترود آلومینیوم صفحه‌ای با ولتاژ 1/5 v/cm می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluating effect of electro – osmotic on mechanical properties of soft clay

نویسندگان [English]

  • Hadis Bibak 1
  • Navid Ganjian 1
  • Jahangir Khazaei 2
  • amin bahmanpour 1
1 Civil Engineering Department, Science and Reseach, Islamc azad University
2 Civil engineering faculty, razi university
چکیده [English]

One of the techniques of stabilization soil is the electrical method. In this method, stabilization of fine-grained soils, especially saturated clay soils, is done by reducing the thickness of the double water layer by establishing an electric current. In this study, to improve and stabilize soft clay soils, the electrokinetic injection method, which The index results of the studies showed that the use of this method increases the unconfined compressive strength from 98 kPa to 223 kPa, decreases the water content from 24  to 15/2 and the plasticity index from 24 to 10 and Soil porosity decreases from 0/675 to 0/443. The results of the chemical analysis confirm the correctness of the physical results in the scanning electron microscope images. According to the water content, Etterberg limits, unconfined compressive strength, and consolidation tests, it was determined that the best performance is related to the use of plate aluminum electrodes with a voltage of  1/5.

کلیدواژه‌ها [English]

  • Soft Clay Soil
  • Electro - Osmosis
  • Electrod Material
  • Electrode Shape

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 56، شماره 12
1403
صفحه 1533-1556

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