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DRAINAGE DESIGNDRAINAGE DESIGNTOOLSTOOLS
•Hydraulics•Manning’s Formula
•Riprap Design•Filters•Use and Function of Geotextiles
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Lan Zi Road, Lan Gao, China
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Захист від розмиву
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Failed during 6” Storm Failed during 6” Storm (50 Year Event)(50 Year Event)10 Killed10 Killed
New York- (1955- 1987)New York- (1955- 1987)150 Meters long- 5 Spans150 Meters long- 5 Spans
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Зруйновано під час 6-бальної бурі Зруйновано під час 6-бальної бурі ((яка буває один раз на яка буває один раз на 50 50 років років Загинуло Загинуло 10 10 чоловік)чоловік)
Нью-Йорк Нью-Йорк - (1955- 1987)- (1955- 1987)Довжина Довжина 150 150 м. -м. - 5 5 прольотівпрольотів
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берегова опора Висока вода берегова опора
Полотно мосту Ущільнена засипка
заплава Опори мосту
Глиб
ина
розм
иву
Розмите дно
Природній розмив
Розмив біля опори
низька вода
лінія природнього грунту
Мал. 10.3.1
Ущільнена засипка
Ділянки вразливі до розмиву
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Hydraulics-Manning’s Formula
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Discharge = (Velocity) x (Area)or
Q = V AWhere Q = discharge, in cubic meters
per second (m3/s). V = average flow velocity,
meters per second (m/s). A = cross sectional area,
in square meters (m2).
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Рівень повної води
Фактор шорсткості русла
Поперечний розріз русла А
Течія
Схема для визначення гідравлічних параметрів русла методом Менінга схил-площа
Периметр заболоченої ділянки
Макс ширина
Макс.глибина (рівень води)
Ухил
Середня глибина=
Площа ------------ширина русла
Гідравл радіус (R) = Площа (A)
------------------------------Периметр заболоченої ділянки (P)
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Manning’s Formula (Metric Version)
V
1n
(R2/3)(S1/2) where V = average flow velocity (meters/second)
n = roughness coefficient(usually 0.04 - 0.07 for natural
channels);see handbook Tables for specific "n"
values)S = channel slope (meter/meter)
R = hydraulic radius (meters) = A/P
A and P are:A = channel cross-sectional area P = wetted perimeter
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Формула Меннінга (в метричних одиницях)
V
1n
(R2/3)(S1/2) де V = середня швидкість течії
(метри/секунду)n = коефіцієнт шорсткості русла
(звичайно 0.04 - 0.07 для природніх русел);
див. табл. в посібнику, значення "n")S = ухил русла (метрів/ метрів)
R = гідравлічний радіус (метрів) = A/P
A та P є:A = площа поперечного розрізу русла P = периметр заболоченої ділянки
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Values of Manning’s Roughness Coefficient (n)
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V1, A1
V2, A2
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ExampleManning’s Formula
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Bank StabilizationRiprap Use
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John Mc Cullah
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Вага каменю ( в кг)
Еквівалент сферичного діаметру каменю (в сантиметрах)
Шви
дкіс
ть т
ечії
води
( м
/сек
)
Ухи
л бо
ково
го с
хилу
Для каменя вагою 2650 кг / куб.м (Gs-2.65)
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Filters
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D.Elton
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DRAINAGE AND FILTRATION
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Filter Bridge Concept
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DRAINAGE AGGREGATE
GEOTEXTILE
SOIL
FILTER BRIDGE
Про
сочу
ванн
я
Наповнювач дренажу
Геотекстиль
Грунт
Фільтрувальний шар
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Other Geosynthetic Applications
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Geosynthetics Types
• Geotextiles• Geogrids• Geonets• Geomembranes• Geosynthetic Clay
Liners• Geopipe• Geofoam• Geocomposites• Geofibers• Geocells
Geosynthetics Use in LVRGeosynthetics Use in LVR
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Tипи • Геотекстиль • Геосито• Геосітка • Геоячейки • Геомембрана • Геосинтетичний
бентонітний килим • Геотрубка • Геопіна • Геоволокна • Геокомпозити
Що таке Геосинтетичні Що таке Геосинтетичні матеріалиматеріали??
J. Tingle, ERDC
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Геосинтетичні матеріали
підпора
f. Мулове загородження для уловлювання наносів
Геотекстильне загородження
Відділені наноси і вода
d. Фільтрування всередині і під дренажними спорудами
b. Від’єднання і зміцнення земляного полотна
канава
Геотекстиль
Дренажний матеріал (пісок або гравій)
земляне полотно
засипка
Матеріал облицювання стіни
Геотекстильний зміцнюючий
матеріал
a. Фільтр під матеріалом насипу, що захищає берег річки
М’який грунт
Прошарки з геотекстилю для зміцнення
Ділянка ймовірного руйнування
c. Укріплення берега на ділянці м’якого грунту
e. Укріплення підпірних споруд
Без геотекстилю
З геотекстилем
вода
кам'яний насип
Замок геотекстильного
матеріалу геотекст. прошарок
геотекстиль
Мал.6.3. Типові геотекстильні матеріали для будівництва сільських доріг (з дозволу виробника волокон AMOCO )
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SUBGRADE SEPARATION AND REINFORCEMENTSUBGRADE SEPARATION AND REINFORCEMENT
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