بررسی فشار خاک وارد بر دیوارهای زیرزمین در روش‌های متداول پایدارسازی گود به‌صورت بالا به پایین

یادآور, سیدعلی; دهقانی, احسان

doi:10.22091/cer.2022.8131.1390

بررسی فشار خاک وارد بر دیوارهای زیرزمین در روش‌های متداول پایدارسازی گود به‌صورت بالا به پایین

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه قم/ دانشکده فنی و مهندسی

² گروه مهندسی عمران، دانشگاه قم، قم، ایران

10.22091/cer.2022.8131.1390

چکیده

روش اجرای گود می‌تواند تأثیر قابل‌توجهی در میزان فشارهای وارده بر دیوارهای حائل داشته باشد؛ بدین منظور و ازآنجایی‌که روش اجرای بالا به پایین امروزه به شکل گسترده‌ای مورداستفاده قرار می‌گیرد، در این تحقیق مطالعه عددی در نرم‌افزار Plaxis به‌منظور بررسی تأثیرات شیوه‌ی خاک‌برداری و چینش المان‌های سازه‌ای در فشار خاک وارد بر دیوارهای زیرزمین، انجام‌شده است. به شکل کلی، در کاربردهای مهندسی جهت تعیین فشار خاک عموماً از فشار خاک حالت سکون و یا فعال و برای دیوارهای مهارشده از دیاگرام‌های ظاهری فشار استفاده می‌شود. نتایج نشان می‌دهند که برخلاف توزیع فشار خاک حالت سکون و فعال، توزیع فشار وارد بر دیوارهای حائل درروش ساخت از بالا هیچ‌گونه قرابتی با توزیع مثلثی نداشته و توزیع فشار ظاهری پک تخمین قابل قبولی از اندازه فشار خاک و توزیع آن ارائه می‌دهد. همچنین نتایج حاکی از تأثیرگذاری بالای تغییر شکل‌ها در فشار وارده بر دیوارها می‌باشد؛ و به‌عنوان نمونه در یک حالت افزایش 60 درصدی تغییرشکل‌ها منجر به کاهش حدود 15 درصدی کل فشار وارد بر دیوار شده است. مدل‌سازی انجام‌شده در این تحقیق صرفاً بر اساس یک نوع از خاک ماسه‌ای بوده که می‌بایست در تحلیل و استفاده از نتایج، به این امر توجه داشت.

کلیدواژه‌ها

20.1001.1.2783140.1401.8.2.2.7

موضوعات

عنوان مقاله [English]

Investigation of the Lateral Soil Pressure on the Basement Walls Constructed Based on Top-down Method

نویسندگان [English]

ُSeyed Ali Yadavar ¹
Ehsan Dehghani ²

¹ university of Qom Department of civil engineering

² Department of Civil Engineering, University of Qom, Qom, Iran

چکیده [English]

The method for retaining the excavated pit could have a significant effect on the soil pressure acting on the retaining walls; For this purpose, since the Top-Down construction method is widely used, In this study, a series of numerical analyses has been conducted to investigate the effect of the excavation method and the distribution of the structural elements on the soil pressure distribution. Generally, for engineering purposes, active and at-rest soil pressure distribution and the Peck apparent pressure distribution (in the case of retained walls) are used for soil pressure determination. The results of the study suggest that in contrast to the at-rest and active soil pressure distribution, the pressure distribution on retaining walls has no similarity with the triangular distribution and the Peck's APD provides an acceptable estimation of soil pressure and its distribution. The results also show that with the increase of deformation due to the construction of the wall, as an example in one case, a 60% increase in ground settlement reduced the soil pressure acting on the walls by up to 15%. It's also noteworthy that this study focuses only on a special type of soil, So the result might be inapplicable to other circum-stances.

کلیدواژه‌ها [English]

Lateral soil pressure
Top-Down method
Peck's APD
Arching effect

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