بررسی همبستگی بین عدد اس پی تی، سرعت موج برشی و مدول برشی کرنش کوچک برای شمال ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان، رشت، ایران

چکیده

سرعت موج برشی Vs و مدول برشی کرنش کوچک Gmax، از مهم ترین پارامترها برای تعیین خصوصیات لرزه ای یک ساختگاه هستند. اگرچه چندین آزمایش میدانی برای اندازه گیری این دو پارامتر وجود دارند، اما انجام آن‌ها به علت پیچیدگی و هزینه بالا، همیشه بسادگی امکان پذیر نیست. از این رو، اندازه گیری Vs و Gmax به طور غیرمستقیم و از طریق معادلات تجربی مرتبط با عدد SPT حاِئز اهمیت است. با توجه به قرار گیری مناطق شمالی ایران در منطقه لرزه‌خیز و توسعه سریع ساخت و ساز در آن، در این پژوهش برای اولین بار با انجام آزمایش‌های صحرایی (نفوذ استاندارد و درون چاهی) و با حفر 11گمانه، روابط همبستگی بین عدد SPT با سرعت موج برشی و با مدول برشی کرنش کوچک برای سه نوع خاک رسی، ماسه‌ای و سیلتی برای این منطقه ارائه گردیدند. نتایج با استفاده از داده‌های 3 گمانه در بخش دیگری از ناحیه شمالی ایران صحت ‌سنجی شدند. براساس روابط همبستگی بین عدد SPT و مدول برشی کرنش کوچک، میزان تاثیرپذیری مدول برشی کرنش کوچک، با تغییر وزن مخصوص لایه‌های خاک مورد بررسی قرار گرفت. نتایج این پژوهش نشان دادند که همبستگی خوبی بین عدد SPTبا سرعت موج برشی و مدول برشی کرنش کوچک وجود دارد. همچنین مشاهده شد حساسیت خاک‌های رسی نسبت به تغییرات وزن مخصوص هر لایه بیش از دو نوع خاک ماسه ای و سیلتی بوده و در تعیین روابط همبستگی برای خاک‌های رسی باید به وزن مخصوص خاک هر لایه توجه ویژه شود.

 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Correlation between SPT Number, Shear Wave Velocity, and Small-Strain Shear Modulus in Northern Iran

نویسندگان [English]

  • Mohammad Hadi Hatefi
  • Mahyar Arabani
  • Meghdad Payan
  • Payam Zanganeh Ranjbar
  • Hassan Ahmadi
Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
چکیده [English]

 The shear wave velocity (Vs) and the small-strain shear modulus (Gmax) are crucial parameters to assess the dynamic properties of soil and the seismic characteristics of a site. In field trials, it may be challenging and costly to quantify these factors, limiting their feasibility. Thus, it is essential to determine indirectly Vs and Gmax using empirical equations linked to the SPT number. The present research focused on the seismic zone in the northern regions of Iran, where construction is rapidly increasing. The field tests were conducted by drilling eleven boreholes and analysing the correlation between SPT number, shear wave velocity, and small-strain shear modulus in clayey, sandy, and silty soil. The results were validated using data from three boreholes in a different area of northern Iran. Gmax is a parameter that reflects the dynamic characteristic of soils, specifically the hardness of geomaterials under shear deformation. Variations in the specific weight of soil layers affecting the small-strain shear modulus were analysed by correlating the SPT number to the small-strain shear modulus. The research findings demonstrated a strong correlation between the SPT number, shear wave velocity, and smallstrain shear modulus. Previous studies and data validation verified the models proposed in this research. Clayey soils are more sensitive to changes in the specific weight of each layer than sandy and silty soils. Since this sensitivity exhibits a non-linear relationship, it is crucial to consider the specific weight of each layer of soil when determining correlations for clayey soils.

کلیدواژه‌ها [English]

  • Seismic Waves
  • Standard Penetration Test
  • Downhole Test
  • Small-Strain Shear Modulus
  • North of Iran

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نشریه مهندسی عمران امیرکبیر
دوره 57، شماره 6
شهریور 1404
صفحه 973-998

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