کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11024213 | 1701172 | 2019 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Behavior evaluation of geogrid-reinforced ballast-subballast interface under shear condition
ترجمه فارسی عنوان
ارزیابی رفتار رابط باالست-زیربالبال تقویت ژئوگرید تحت شرایط برشی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی
The effective functioning of a railway track under operating conditions depends largely on the performance of various rail track interfaces (e.g. ballast-subballast interface, subballast-subgrade interface). In this context, a series of large-scale direct shear tests were conducted to investigate the shear behavior of unreinforced and geogrid-reinforced ballast-subballast interfaces at different normal stresses (Ïn) and rates of shearing (Sr). Fresh granite ballast and subballast having average particle size (D50) of 42â¯mm and 3.5â¯mm respectively, and five geogrids with different aperture shapes and sizes were used in this study. Tests were performed at different normal stresses (Ïn) ranging from 20 to 100â¯kPa and shearing rates (Sr) ranging from 2.5 to 10.0â¯mm/min. The laboratory test results confirmed that the shear strength of ballast-subballast interface was highly influenced by the applied normal stress (Ïn) and rate of shearing (Sr). The friction angle (Ï) of unreinforced ballast-subballast interface was found to decrease from 63.24° to 47.82° and dilation angle (Ï) from 14.56° to 5.23° as the values of Ïn and Sr increased from 20 to 100â¯kPa and 2.5-10.0â¯mm/min, respectively. Further, the breakage of ballast (Bg) was found to increase from 2.84 to 6.69%. However, geogrid inclusions enhanced the shear strength of the ballast-subballast interface and also reduced the extent of Bg. The results indicate that it is possible to establish a relationship between the friction angle (Ï) and breakage of ballast (Bg), wherein the friction angle (Ï) of both unreinforced and geogrid-reinforced interfaces reduces with the increase in breakage (Bg). The interface efficiency factor, defined as the ratio of the shear strength of the geogrid-reinforced ballast-subballast interface to the original shear strength of ballast-subballast interface varies from 1.04 to 1.22. Moreover, the current study revealed that the shear behavior of ballast-subballast interface was influenced by geogrid aperture size (A).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geotextiles and Geomembranes - Volume 47, Issue 1, February 2019, Pages 23-31
Journal: Geotextiles and Geomembranes - Volume 47, Issue 1, February 2019, Pages 23-31
نویسندگان
Kumari Sweta, Syed Khaja Karimullah Hussaini,