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Evaluation of improvement techniques for ballasted railway track model resting on soft clay
مقدم أطروحة جامعية
مشرف أطروحة جامعية
al-Suudi, Namir K. S.
al-Qaysi, Mahmud Rashid
الجامعة
الجامعة التكنولوجية
الكلية
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القسم الأكاديمي
قسم هندسة البناء و الإنشاءات
دولة الجامعة
العراق
الدرجة العلمية
دكتوراه
تاريخ الدرجة العلمية
2010
الملخص الإنجليزي
More than 1400 km of new railway networks are expected to be constructed in Iraq in the near future, in addition to the full rehabilitation of the existing network.
About 60 % of the new network is located in the middle and southern parts of Iraq where most of the ground is basically sedimentary, soft to very soft cohesive soils especially in areas close to the marshes.
In such cases it is always recommended to improve the properties of the soil to increase its ability in bearing the different applied stresses and to control the expected generated settlements The present work consists of proposing and evaluating twelve methods for improving the soft soil underneath a ballasted track under monotonic loading.
Two of the twelve methods were evaluated under repeated loading.
The evaluation of each method is based on the amount of increase in bearing capacity and the reduction in settlement as compared to the untreated soil.
The proposed methods are : 1- Treatment of soft saturated soil using a top ballast layer.
2- Treatment of soft saturated soil using a top ballast layer reinforced by single georgic layer.
3- Treatment of soft saturated soil using a top ballast layer reinforced by multilayer of georgic at constant spacing.
4- Treatment of soft saturated soil using a top ballast layer reinforced by multilayer of georgic at different spacing.
5- Treatment of soft saturated soil using ordinary stone columns.
6- Treatment of soft saturated soil using ordinary stone columns incorporated with top ballast layer.
7- Treatment of soft saturated soil using ordinary stone columns incorporated with top ballast layer reinforced by single georgic layer.
8- Treatment of soft saturated soil using ordinary stone columns incorporated with top ballast layer reinforced by two georgic layers.
9- Treatment of soft saturated soil using encased stone columns.
10- Treatment of soft saturated soil using encased stone columns incorporated with top ballast layer.
11- Treatment of soft saturated soil using encased stone columns incorporated with top ballast layer reinforced by single gorged layer.
12- Treatment of soft saturated soil using encased stone columns interacting with top ballast layer reinforced by single gorged layer.
Proposed number 7 and 11 were evaluated under repeated loading.
Model tests were performed for each proposed improvement method using a special loading set up which was previously manufactured providing full control of loading increments in both monotonic and repeated patterns.
Among the twelve improvement methods it is found that improvement method number 11 (Treatment of soft saturated soil using encased stone columns incorporated with top ballast layer reinforced by single gorged layer) provided the most satisfactory results in terms of bearing improvement ratios and settlement reduction ratios under both monotonic and repeated loading conditions, as compared to the untreated soil.
التخصصات الرئيسية
الموضوعات
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Abawi, Zaynah Walid Samuil. (2010). Evaluation of improvement techniques for ballasted railway track model resting on soft clay. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305242
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Abawi, Zaynah Walid Samuil. Evaluation of improvement techniques for ballasted railway track model resting on soft clay. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2010).
https://search.emarefa.net/detail/BIM-305242
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Abawi, Zaynah Walid Samuil. (2010). Evaluation of improvement techniques for ballasted railway track model resting on soft clay. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305242
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-305242
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
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