ارزیابی وضعیت مقاومت صحرایی و آزمایشگاهی برای اختلاط عمیق رس-سیمان و رس- آهک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران

2 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه صنعتی کرمانشاه، ایران

چکیده

در این مطالعه نتایج مقاومت ستون های اختلاط عمیق و حجیم خاک-چسباننده مورد ارزیابی قرار گرفته است. برای این منظور، نمونه های متعدد صحرایی و آزمایشگاهی استوانه ای شکل به طول cm 20 و قطر cm 10، حاصل اختلاط خاک - سیمان و خاک - آهک عمل آوری شده در دما و رطوبت محیط های آزمایشگاهی و صحرایی، تحت آزمون های بارگذاری تک محوری محصورنشده قرار گرفته اند. مخلوط های وزنی مختلف خاک- چسباننده با حداقل 6% و حداکثر 14% وزنی مواد چسباننده تهیه شده اند. همچنین، اختلاط عمیق و حجیم خاک در مقیاس صحرایی در خاک رسی لاغر CL به کمک دستگاه اختلاط-حفار ساخته شده در جریان انجام این پژوهش، اجرا شده است. علاوه بر نمونه های استوانه ای آزمایشگاهی، از چاهک های اختلاط حجیم در دو چیدمان خطی (تکی) و ساعتی (گروهی) نیز نمونه های استوانه ای برداشت شده و در آزمایشگاه تحت بارگذاری تک محوری تا لحظه شکست قرار گرفته اند. نتیجه کلی این مطالعه، پیشنهاد ضرایب تبدیل مقاومت نمونه آزمایشگاهی به صحرایی و بالعکس، در شرایط یکسان هندسی ساخت و نوع مصالح انتخابی و شرایط متفاوت محیطی عمل آوری نمونه ها است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Field and laboratory resistance assessment for deep mixing of clay-cement and clay-lime

نویسندگان [English]

  • Davod Jalalvand 1
  • Jahangir Khazaei 1
  • Yazdan Shams Maleki 2
1 Department of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
2 Kermanshah University of Technology
چکیده [English]

Evaluation of the strength of deep mixing columns as a soil improvement method is the main subject of this study. In this research, cylindrical laboratory samples with a length of 20cm and a diameter of 10cm have been constructed. The result of mixing soil-cement and soil-lime was taken into account that cured in the temperature and humidity of both laboratory environments and field conditions and then subjected to unconfined uniaxial loading tests. Different weight mixtures of soil-adhesive materials with a minimum of 6% and a maximum of 14% by weight of adhesive materials have been used for this purpose. Also, in this study, the deep mixing of the soil in real and field scale has been implemented in a layer of thin clayey soil, CL, with low plasticity properties of CL-type clay. Mixing of deep field soil has been carried out by the designed digging-mixing machine. In addition to laboratory cylindrical samples, cylindrical samples were taken from bulk mixing columns in two linear (single) and clock-type (group) arrangements and were subjected to uniaxial loading in the laboratory until the moment of failure. The general result of this study is the proposal of conversion coefficients of strength of laboratory samples to field samples and vice versa, in the same conditions of construction geometry and the type of selected materials and different environmental conditions of samples curing.

کلیدواژه‌ها [English]

  • Deep Mixing
  • Soil-Cement
  • Soil-Lime
  • Field Sample
  • Laboratory Sample
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