ارزیابی عددی اثر لایه‌بندی غیر افقی خاک بر پاسخ لرزه‌ای تپه‌های متناوب نیم‌سینوسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار مهندسی عمران - زئوتکنیک دانشگاه صنعتی قم.

2 دانشیار دانشکده زمین‌شناسی، دانشگاه تهران، تهران، ایران

3 دانشجوی کارشناسی ارشد عمران، دانشکده فنی و مهندسی، دانشگاه صنعتی قم، قم، ایران

چکیده

ویژگی‌های توپوگرافی و زمین‌شناسی، تأثیر قابل توجهی بر پاسخ لرزه‌ای سازه‌ها دارد. برخی از توپوگرافی‌ها در طبیعت به طور متناوب وجود دارند. تناوب توپوگرافی می‌تواند از دلایل تشدید قابل توجه حرکت لرزه‌ای زمین باشد. با این‌حال، اکثر مطالعات بر تشدید ناشی از یک توپوگرافی واحد تمرکز کرده‌اند. پژوهش‌های محدودی بر روی توپوگرافی‌های متناوب و در کنار یکدیگر انجام شده‌است. در این مقاله، تشدید حرکت لرزه‌ای زمین در تپه‌های ناهمگن (از نظر جنس مصالح) به شکل نیم‌سینوسی و متناوب که مصالح تپه، لایه‌هایی با زوایای ۱۵ تا ۷۵ درجه نسبت به افق دارند، بررسی شده‌اند. در تمام زاویه‌های لایه‌بندی، با افزایش تعداد تپه‌ها، میزان تشدید جابه‌جایی نیز افزایش می‌یابد؛ مثلاً برای خط‌الرأس، در زاویه ۴۵ درجه حداکثر بزرگنمایی در حضور یک ناهمواری ۶۳/۱، ولی همین مقدار زمانی‌که سه ناهمواری توپوگرافی باشد به ۶۶/۱ می‌رسد. در زاویه‌های کوچک‌تر، افزایش تشدید تپه‌های سه‌لایه نسبت به تپه‌های دولایه، قابل توجه‌تر است و هرچه زاویه بین لایه‌ای بزرگ‌تر ‌شود مقدار تشدید تپه‌های دو و سه ‌لایه به یک‌دیگر نزدیک‌تر می‌شوند. بنابراین هریک از پارامترهای تغییر زاویه مصالح لایه‌های موجود در تپه و نیز کم و زیاد شدن تعداد لایه‌های موجود در تپه بر میزان بزرگنمایی‌های لرزه‌ای تأثیر داشته و باید به هر کدام از این پارامترها درطراحی‌های لرزه‌ای توجه شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical evaluation of the effect of soil non-horizontal layering on seismic response of semi-sin alternating hills

نویسندگان [English]

  • masoud amelsakhi 1
  • abdollah sohrabi bidar 2
  • ayda Haraty 3
1 assistant profesor, qom university of technology
2 Associate Professor, Faculty of Geology, University of Tehran, Tehran, Iran.
3 ‎3M.Sc. Student, Department of Civil Engineering, Qom University of ‎Technology, Qom, Iran.‎
چکیده [English]

Topographic and geological features have a significant impact on ground movements. Some topography is distributed intermittently in nature. Topographic alternation can be one of the reasons for the significant intensification of earth's seismic motion. However, most studies have focused on the amplification caused by a single topography. Limited research has been conducted on intermittent topography. In this paper, the intensification of seismic motion of the earth in heterogeneous semi-sin hills that hill materials, layers with angles of 15 to 75 degrees relative to the horizon, have been investigate. At all angles of layering, with the increase in the number of hills, the displacement intensification also increases, for example, for the ridge, at an angle of 45 degrees, the maximum magnification in the presence of a roughness is 1.63, but the same amount reaches to 1.66 when the three roughness is topographical. At smaller angles, the increase in the amplification of three-layer hills is more noticeable than the two-layer hills, and the larger the inter layer angle, the closer the amplification of the two and three-layer hills to the other. Therefore, each of the parameters of changing the angle of materials of the layers in the hill, as well as the increase in the number of layers in the hill, have an impact on the amount of seismic amplifications and each of these parameters should be considered in seismic designs.

کلیدواژه‌ها [English]

  • topography
  • soil layering
  • Semi-Sine Hills

مراجع

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  • تاریخ دریافت: 18 تیر 1401
  • تاریخ بازنگری: 20 فروردین 1402
  • تاریخ پذیرش: 30 اردیبهشت 1402

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