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Lusail CP-4

Groundwater Control

Joseph G

on 6 January 2013

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Transcript of Lusail CP-4

Groundwater Control Lusail Highway comprises of Two sections of Roads (A1 and A6) connecting south to north and east to west, for a total length of 5.2km with 6 lanes, includes underpasses and bridge structures. Area-U Project Overview Lusail CP-4 Doha, State of Qatar Lusail is the newest planned city in Qatar and located on the coast, and in the northern part of the municipality of Al Kheisa. Lusail is located about 15 km north of the city centre of Doha. As part of development of the city of Lusail, CP-4 Roads and Interchange Project package are to be constructed. The project areas have been divided into two sub-areas according to structures (e.g., Interchange/Underpasses and Shaft), and these sub-areas have been divided into zones. 2. Dewatering Requirements 2. Proposed Dewatering Systems Project Keyplan Lusail CP-4 1. Project Background Wadi Underpass Zone-1 Junction-12 Underpass Zone-3 Junction-13
Underpass Junction-14
Underpass Tunnel T-1 Zone-4 Trough Structure C&C Tunnel Zone-2 1. Design Parameters a. Permeability k = 9.6 x 10-6 to 2.1 x 10-5 m/s *

*Based on the Packer Test result conducted by Fugro Middle East. 2. Dewatering Requirements 1. Design Parameters b. Estimated Flowrates 2. Dewatering Requirements Based on the technical data available, Action proposes to install Deepwells to enable groundwater control. Typical Deepwell Dewatering System Deepwell System Layout Junction-12 Underpass Deepwell System Layout - Junction-12 Underpass Deepwell System Layout - Wadi Underpass Wadi Underpass Junction-13 Underpass Deepwell System Layout - Junction-13 Underpass Junction-14 Underpass, Tunnel T-1 Deepwell System Layout - Junction-14 Underpass, Tunnel T-1 Trough Structure, C&C Tunnel Deepwell System Layout - Trough Structure, C&C Tunnel Dewatering Discharge Options Junction J-12 ~3400m Wadi Underpass ~1600m Junction-13 Underpass 760m Junction-14 Underpass 800m Trough Structure,
C&C Tunnel 350m 4. Potential Risks/ Contingencies in Dewatering Design 4. Potential Risks/ Contingencies in Dewatering Design Potential Risks 1. Extra wells shall be added as per the volume of the extra water. 2. Recommend Geotechnical Solutions (grouting, etc) 1. Contingencies: 3. Monitoring of groundwater levels outside the excavation areas to avoid any Ground settlements.
1. Extra Water Flow that may be caused by anomalies in actual ground strata (cavities, voids, etc).

2. Risks of Ground settlement to Surrounding Areas. Excavation Details
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