ارزیابی آزمایشگاهی اثر صمغ فارسی بر پارامترهای مقاومتی سطوح تماس مختلف خاک-سازه

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان

چکیده

ارزیابی رفتار مکانیکی سطح تماس خاک-سازه به عنوان یک عامل موثر بر عملکرد مقاومتی و تغییر شکل سازه، مورد توجه بسیاری از محققان قرار گرفته است. با توجه به تاثیر برهم‌کنش سازه و لایه‌ی خاک اطراف آن بر ظرفیت باربری خاک ، مطالعه‌ی شرایط فیزیکی ناحیه فوق امری مهم می‌باشد. در این پژوهش با در نظر گرفتن مدت زمان عمل آوری، اثر استفاده از صمغ فارسی و میزان زبری فولاد در رفتار سطح تماس خاک- سازه به وسیله دستگاه برش مستقیم بزرگ مقیاس مورد بررسی قرار گرفته است. صمغ مصرفی در سه میزان 3/0، 6/0 و 9/0 درصد بر روی سه سطح صیقلی، زبر و پوشیده شده با ژئوتکستایل استفاده شد. بر اساس نتایج با تزریق صمغ فارسی به سطح تماس خاک-شمع، چسبندگی بین خاک و سطح تماس تا حدود 20 برابر و زاویه اصطکاک داخلی به میزان یک درجه افزایش می‌یابد. نرخ افزایش پارامترهای مقاومتی با زیاد شدن مدت زمان عمل‌آوری کاهش می‌یابد.

کلیدواژه‌ها


عنوان مقاله [English]

Laboratory Evaluation of the Effect of Persian Gum on the Strength Parameters of Different Soil-Structure Interfaces

نویسندگان [English]

  • Mohammad Milad Shirazi Nejad
  • Mohammadreza Khanmohammadi
  • Hamid Hashemolhosseini
Department of Civil Engineering, Isfahan University of Technology
چکیده [English]

Evaluation of mechanical behavior of the soil-structure interface has been the focus of many researchers as an effective factor on the strength performance and deformation of the structure. Since the interaction of the structure and the soils around it will have a great impact on the soil bearing capacity, it is important to study the physical conditions. In this study, taking into account the curing time, effect of using Persian gum and the roughness of the steel on the behavior of the soil-structure interface using large-scale direct shear test have been investigated. The Persian gum was used in three amounts of 0.3, 0.6 and 0.9% on three smooth, rough and geotextile covered surfaces. Based on the results, by injecting Persian gum into the soil-candle interface, the adhesion between soil and contact surface increases by about 20 times and the internal friction angle increases by one degree. The rate of increase of strength parameters decreases with increasing curing time.

کلیدواژه‌ها [English]

  • Soil-structure interface
  • Persian gum
  • Curing time
  • Roughness
  • large-scale direct shear test
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