بررسی رفتار برشی ماسه کربناته براساس مدل رفتاری منظری و دافالیاس

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه بین المللی امام خمینی

چکیده

در این مقاله توانایی و قابلیت مدل رفتاری منظری و دافالیاس که مدل پیشرفت‌های در زمینه مدل رفتاری خاک است، جهت پیش‌بینی رفتار برشی خاک ماسه کربناته با دانه‌های شکننده، ارزیابی می‌گردد. پارامترهای خاک مورد نظر و چگونگی تأثیر آنها بر نمایش رفتار خاک بررسی می‌شود. با مقایسه نمودارهای تنش-کرنش حاصل از آزمایش سه محوری و مدل در نمونه‌های سست و متراکم، مشاهده شد که نتایج حاصل از مدل رفتاری با نتایج آزمایشگاهی تطابق خوبی دارد؛ ولی با بررسی نمودارهای کرنش حجمی در برابر کرنش محوری مشاهده می‌شود که خروجی‌های مدل رفتاری منظری و دافالیاس در مقایسه با نتایج آزمایش، دقت کافی را ندارد. دلیل اصلی این امر آن است که خردشدگی دانه‌های خاک و اثر آن بر روی تغییر حجم خاک در مدل دافالیاس و منظری در پیش‌بینی کرنش حجمی مد نظر قرار نگرفته است. با این وجود، مدل رفتاری مذکور، روند تغییرات را به طور مناسبی پیش‌بینی می‌کند. این مدل رفتاری در تنش‌های همه جانبه‌ی زیاد، نتایج بهتری در مقایسه با تنش‌های همه جانبه‌ی کم در بررسی کرنش حجمی نمونه‌ها دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Carbonate Sand Shear Behavior Based on Manzari anid Dafalias Behavioral Model

نویسندگان [English]

  • mehgdad hamidzadeh
  • Mahmoud Hassanlourad
  • Rasoul Mohammadpour Salout
Imam Khomeini International University
چکیده [English]

Investigating soil characteristics and models for better design and performance of construction projects is very important. In this paper, the ability of the behavioral model of Manzari and dafaliais, which is an advanced model in the field of soil behavioral model, was evaluated to predict the shear behavior of carbonate sand with brittle seeds. Soil parameters were examined and their effects on soil behavior display were studied. By comparing strain stresses obtained from a tri-axial test and a model in loose and dense samples, it was observed that the results of the behavioral model are in good agreement with experimental results. However, by examining the volumetric strain graphs against the axial strain, the outcomes of the Manzari and dafaliais behavioral model were not sufficiently accurate in comparison with the experimental results. The main reason for this was the crushing of soil grains and its effect on soil volume variation in the Dafalias model. There is no perspective on the prediction of the volumetric strain. Nevertheless, the above-mentioned behavioral model predicts the trend of change. This behavioral model in high imbibed tensions had better results in comparison with the immensely low stresses in the study of strain volumes of samples.

کلیدواژه‌ها [English]

  • Soil
  • Manzari and Dafalias Behavioral Model
  • Carbonate Sand
  • Mode Parameter
  • Triaxial Test
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