کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4743493 1641816 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical investigation on factors for deep-seated slope stability of stone column-supported embankments over soft clay
ترجمه فارسی عنوان
بررسی عددی در مورد عوامل پاکسازی عمق سکوی سنگی سنگ های پشتیبانی شده روی سنگ های رسوبی
کلمات کلیدی
فاکتور ایمنی، ماموریت پایداری شیب، ستون سنگ، خاک رس نرم
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


• The 2-D column-wall models had equivalent results as the 3-D models.
• Stress concentration effect should not be considered in stability analysis.
• Stone columns did not all mobilize the shear strengths under a short-term condition.
• The equivalent area models yielded higher FS under a short-term condition.

Stone columns have been commonly used as an alternative to solve deep-seated slope stability problems. Due to the complexity of a three-dimensional (3-D) arrangement of multiple columns, a 3-D problem has been commonly converted into a two-dimensional (2-D) model which has equivalent properties and dimensions, by the column-wall method and the equivalent area method. In this paper, two column-wall approaches based on matching either column geometry or column properties were compared and verified by 3-D numerical results in the stability evaluation of the stone column-supported embankment over soft soils. This study also investigated the 2-D numerical models using the column-wall method and the equivalent area method considering the factors of stress concentration, area replacement ratio, and soil conditions under short-term and long-term conditions. The numerical results show that the equivalent area method resulted in a continuous critical slip surface in the stone column-supported embankment over soft soil; however, no continuous slip surface developed using the column-wall method. Under the short-term condition, the computed factor of safety by the equivalent area model with or without considering the stress concentration effect was greater than that computed by the column-wall model. However, their difference became smaller under the long-term condition. The columns at certain locations along a prescribed slip surface from the equivalent area method did not mobilize their shear strengths under the short term condition. A reduction factor of 0.9 is suggested to correct the calculated factor of safety by the equivalent area method without considering the stress concentration ratio to that by the column-wall method under the short-term condition. No reduction factor (or the reduction factor of 1.0) is proposed under the long-term condition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Geology - Volume 168, 16 January 2014, Pages 104–113
نویسندگان
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