پایان نامه بررسی عددی تاثیر ژئوبگ ‏ها بر کنترل آب‏شستگی کوله پل ‏ها

فهرست پایان نامه بررسی عددی تاثیر ژئوبگ ‏ها بر کنترل آب‏شستگی کوله پل ‏ها

فهرست:

فصل اول: مقدمه

1-1- انواع کوله پل‏ها، مکانیابی و ساخت... 2

1-1-1- انواع کوله پل‏ها 2

1-1-2- مکانیابی کوله پل‏ها 3

1-1-3- ابعاد کوله و نحوه ساخت... 4

1-2- میدان جریان.. 4

1-3- پروسه آب‏شستگی.. 6

1-3-1- آب‏شستگی کلی.. 6

1-3-2- آب‏شستگی کوله پل.. 7

1-4- معرفی تحقیق.. 8

 

فصل دوم: مروری بر تحقیقات پیشین و تئوری تحقیق

2-1- مقدمه. 11

2-2- طبقه بندی آب‏شستگی موضعی کوله پل‏ها 12

2-3- میدان جریان و تنش برشی بستر در محل کوله پل.. 13

2-4- پارامترهای تاثیرگذار بر آب‏شستگی کوله پل‏ها 16

2-4-1- طبقه بندی پارامترها 16

عنوان                                                                                                                          صفحه

 

2-4-2- آنالیز ابعادی.. 17

2-5- تاثیر پارامترهای مختلف بر عمق آب‏شستگی.. 18

2-5-1- سرعت جریان عبوری.. 18

2-5-2- عمق جریان عبوری.. 20

2-5-3- طول کوله، نسبت تنگ شدگی و نسبت دهانه. 21

2-5-4- اندازه و دانهبندی رسوبات.. 22

2-5-5- شکل کوله. 25

2-5-6- جهت قرارگیری کوله نسبت به جریان عبوری.. 26

2-5-7- هندسه آبراهه. 27

2-5-8- تغییرات زمانی آب‏شستگی.. 28

2-6- تخمین عمق آب‏شستگی.. 31

2-6-1- رویکرد رژیم جریان.. 31

2-6-2- رویکرد تجربی.. 32

2-6-3- رویکرد تحلیلی یا شبه تجربی.. 37

2-7- مطالعات عددی آب‏شستگی اطراف کوله پل‏ها 38

2-8- روش‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌های کنترل آب شستگی.. 40

2-9- نتیجه‏گیری.. 42

 

فصل سوم: ضوابط طراحی ژئوبگ‌ها

3-1- مقدمه. 44

3-2- ضوابط کلی پایداری.. 44

3-2-1- پایداری در برابر بار موج.. 44

3-2-2- پایداری بار جریان.. 48

عنوان                                                                                                                          صفحه

 

3-3 -ضوابط پایداری ژئوبگ‌ها 52

3-3-1- بحث در مورد دانسیته نسبی.. 52

3-3-2- محافظت شیب... 52

3-3-3- پایداری المان‌های تاج.. 56

3-4- ضابطه طراحی بر اساس بار جریان.. 57

3-5- پایداری ژئوبگ‌ها از منظر مکانیک خاک... 57

 

فصل چهارم:  معرفی نرم‏افزار FLOW-3D

4-1- مقدمه. 59

4-2- مدل هیدرودینامیک... 59

4-3- مدلسازی رسوب.. 62

4-4- مدل آشفتگی.. 66

 

فصل پنجم: نتایج شبیه‏سازی عددی

5-1- مقدمه. 69

5-2- کالیبراسیون مدل و آنالیز حساسیت مش‏بندی.. 70

5-2-1- مشخصات مدل و نحوه شبکه‏بندی.. 70

5-2-2- نتایج شبیه‏سازی.. 73

5-2-2-1- نتایج شبیه‏سازی جریان.. 73

5-2-2-2- نتایج شبیه‏سازی رسوب.. 75

5-3- بررسی تاثیر ژئومت بر کنترل آب‏شستگی کوله با دیواره قائم.. 81

5-4- بررسی تاثیر ژئوبگ و ژئومت بر کنترل آب‏شستگی اطراف کوله باله‏ای.. 83

5-4-1- مشخصات مدل کوله باله‏ای.. 83

 

عنوان                                                                                                                          صفحه

 

5-4-2- نتایج شبیه‏سازی جریان و فرسایش اطراف کوله باله‏ای بدون
 وجود لایه محافظ.. 85

5-4-3- نتایج شبیه‏سازی جریان و فرسایش اطراف کوله باله‏ای
 محافظت شده با ژئوبگ... 87

5-4-4- شبیه‏سازی جریان و فرسایش اطراف کوله بالهای محافظت شده
 به وسیله ژئومت... 91

5-5- تاثیر ضخامت و عرض لایه ژئومت بر کنترل آب‏شستگی اطراف کوله باله‏ای.. 93

5-6- بررسی اثر عمق جریان بر آب‏شستگی اطراف کوله باله‏ای بدون لایه
 محافظ و کارایی کوله حفاظت شده با لایه ژئومت... 98

5-7- مطالعه تاثیر سرعت جریان بر آب‏شستگی اطراف کوله باله‏ای
 بدون لایه محافظ و کارایی کوله حفاظت شده با لایه ژئومت... 100

5-8- بررسی تاثیر اندازه ذرات رسوبی و پارامتر شیلدز بر آب‏شستگی اطراف کوله باله‏ای بدون لایه محافظ و کارایی کوله حفاظت شده با لایه ژئومت و لایه ژئوبگ... 102

 

فصل ششم:  نتایج تحقیق و پیشنهادها

6-1- نتایج تحقیق.. 105

6-2- پیشنهادها برای کارهای آینده. 106

 

فهرست منابع.. 107

 

 

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