Lecture 6- Eathwork Construction III

Lecture 6- Eathwork Construction III - C E M 6 2 C o n s t...

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Unformatted text preview: C E M 6 2 C o n s t r u c t i o n M e t h o d s CEM 602 Construction Methods Lecture 6 Diaphragm/Slurry Walls 1 L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s C E M 6 2 C o n s t r u c t i o n M e t h o d s Background L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 2 C E M 6 2 C o n s t r u c t i o n M e t h o d s History • Diaphragm and slurry walls refers to reinforced concrete walls below ground using the slurry method for trench stabilization • Slurry wall constructions was developed in the early 1950s • The technique was developed in 1952-1953 by two engineers in Italy • Bentonite slurry (drilling mud) was employed in oil drilling since 1901 L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 3 C E M 6 2 C o n s t r u c t i o n M e t h o d s History • Originally the length the length of the panel was 6-12 ft gradually extended to 20-30 ft • First tool for rectangular excavation was the free hanging mechanical clamshell • Another method developed for difficult soils was called “reverse circulation” • After first application in Italy and Europe in the 1950s, it was first applied in Canada in 1956 and in the United States in 1963 • The technique became very common in the L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 4 C E M 6 2 C o n s t r u c t i o n M e t h o d s Uses and Advantages • Useful characteristics of diaphragm walls – Rigidity – Watertightness – Vertical and lateral support – Installed without much vibration – Constructed in low-head-room areas L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 5 C E M 6 2 C o n s t r u c t i o n M e t h o d s Uses and Advantages • Diaphragm walls are used for continuous vertical concrete walls cast in place • Proper execution leads to a watertight earth retaining structure with minimum soil decompression or movement • Can be used for permanent and temporary retaining walls and bearing elements in subways, depressed highways, basements, earth retaining, cofferdams • Unreinforced walls used for impermeable cutoff under hydraulic structures L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 6 C E M 6 2 C o n s t r u c t i o n M e t h o d s Installation L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 7 C E M 6 2 C o n s t r u c t i o n M e t h o d s Use of Excavation Fluids • Bentonite slurry is used to stabilize trench and support sides • Bentonite holds in place pervious soils such as sand and grave land forms a filter membrane on the sides • Bentonite forms a gel when undisturbed and a fluid when mixed (Called Thixotropy) • Membrane formed is impermeable to water entering L e c t u r e 6- D i a p h r a g m / S l u r r y W a l l s 8 C E M 6 2 C o n s t r u c t i o n M e t h o d s Properties and Preparation of Slurry • Bentonite slurry is a mix of water and a...
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Lecture 6- Eathwork Construction III - C E M 6 2 C o n s t...

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