کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8906427 | 1634411 | 2018 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A unified formulation of stress-strain relations considering micro-damage for expansive soils exposed to freeze-thaw cycles
ترجمه فارسی عنوان
فرمول بندی یکپارچه روابط تنش-تنش با توجه به آسیب های میکرو برای خاک های فراگیر در معرض چرخه یخ زدایی
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کلمات کلیدی
خاکهای فراگیر، چرخه یخ زدگی، روابط استرس-فشار، میکرو آسیب، رویکرد چندگانه،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Expansive soils, which contain the clay mineral montmorillonite, are a worldwide problem and occur in many parts of the world. Some cutting slopes at Yanji along the Jilin-Tumen-Hunchun high-speed railway in Northeast China as typical seasonally frozen region consist of expansive soils. The mechanical and microstructural properties of these soils subjected to periodic freeze-thaw (F-T) cycles may change and further produce potential risk to the earth retaining structures in the slope. In this study, a multi-scale approach was implemented and the microstructural and mechanical changes of expansive soils exposed to F-T cycles were investigated. To carry out these tasks, mercury intrusion porosimetry (MIP), X-ray computerized tomography (X-ray CT), and consolidated-drained (CD) triaxial tests were conducted. The microstructural analysis results reveal that a bimodal distribution of pore sizes exists for the expansive soils and the effect of freeze-thaw cycles is concentrated in pores of more than 5â¯Î¼m. Voids observed by X-ray CT scanner are generated and extended as increasing the number of F-T cycles. The results of mechanical properties demonstrate that when the number of freeze-thaw cycles exceeds a threshold value (i.e., 7), the effect of F-T cycles on the shear strength and volumetric strain loses significance. Based on the experimental results, a unified expression taking into account the micro-damage for stress-strain behaviors of expansive soils exposed to F-T cycles was developed. An average damage variable defined through the CT values was adopted to quantify this micro-damage. The agreement between experimental and predicted results confirms the possibilities of reproducing some most important features of expansive soils suffered to F-T cycles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cold Regions Science and Technology - Volume 153, September 2018, Pages 164-171
Journal: Cold Regions Science and Technology - Volume 153, September 2018, Pages 164-171
نویسندگان
Liang Tang, Shengyi Cong, Xianzhang Ling, Wenqiang Xing, Zhong Nie,