Achieving more for less at Canary Wharf Crossrail station, London

Yeow, Hoe-Chian; Nicholson, Duncan; Bryant, Cliff; Westbury, Martin

doi:10.1680/cien.11.00039

Cited by 4 publications

(4 citation statements)

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“…However, past groundwater abstraction has resulted in the classic under-drained profile that is seen throughout London today. The groundwater profile is presented in Yeow et al (2012). The decline in abstraction rates since the 1960s has resulted in a rise in the water level, which has been well documented since Simpson et al (1989).…”

Section: Hydrogeologymentioning

confidence: 85%

“…This allowed back analysis of the east and west cofferdam end (head) walls and the implementation of the observational method, which led to the omission of the temporary props from the constructions sequence. This is explained in detail by Yeow et al (2012).…”

Section: Monitoringmentioning

confidence: 99%

“…The Giken system is described in Yeow et al (2012); it uses a combination of augering and hydraulic push-in force to advance the piles. The geometries of the tubular steel piles were 1219 mm external diameter, typically 14 mm wall thickness and between 18 .…”

Section: Cofferdammentioning

confidence: 99%

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Canary Wharf Crossrail station cofferdam, London, UK: design, construction and performance

Travers¹,

Yeow²

2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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months. This paper provides useful guidance for practising engineers on the design and construction of cofferdams' retaining walls in a dock environment. It describes the performance of the retaining structures constructed using the innovative Japanese Giken tubular pile system. Some details are also included of the site-wide dewatering undertaken to lower the groundwater in the Chalk and control it, allowing excavation into the Upnor Formation and Thanet Sand.The effects of unexploded ordnance probing on the performance of the retaining wall are described. Together with details of the laboratory tests undertaken to inform the ship impact berm design and the monitoring system used to verify the retaining wall design and comparison of the predicted and measured wall movements during excavation.

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Section: Hydrogeologymentioning

confidence: 85%

Section: Monitoringmentioning

confidence: 99%

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Canary Wharf Crossrail station cofferdam, London, UK: design, construction and performance

Travers¹,

Yeow²

2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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“…The undrained shear strength was obtained from both triaxial tests on 100 mm samples of rotary cores and U100s from boreholes at the WTH site and from correlation with in situ SPTs. Soil stiffness values in the Lambeth Beds of E u /c u ¼ 2000 were adopted (based on experience at Canary Wharf Crossrail Station) (Yeow et al, 2012). Conforming and MP geotechnical parameters, piezometric pressures and soil stiffness values for the WTH box are shown in Figure 2 and tabulated in Table 4.…”

Section: 'Most Probable' Back Analysismentioning

confidence: 99%

Application of observational method at Crossrail Tottenham Court Road station, UK

Yeow¹,

Nicholson²,

Man³

et al. 2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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Excavation of the western ticket hall box at Tottenham Court Road station represented a critical path activity of the Crossrail railway project in London, UK. Base slab construction and preparatory sprayed concrete lining works needed to be completed before the arrival of the two tunnel boring machines. A full observational method (OM) design was implemented to eliminate the lowest level of temporary propping, resulting in a 13 m prop-free excavation at the bottom of the 30 m deep diaphragm wall station box. This paper describes the design and successful implementation of the OM, which eliminated the need to fabricate, install and remove the fifth level of temporary propping. It covers the comprehensive review of the original design input parameters, back analysis of the most probable geotechnical design parameters and comparison of wall deflection and forces in the temporary props from early stages of the construction works. The robust strategy formulated as part of the observational method design to control the subsequent excavation is described: this included trigger criteria, a review process and predetermined contingency measures to ensure safe execution of the excavation works. A genuinely collaborative effort between client, permanent and temporary works designers, independent design checker and the contractor is elaborated. Cost and programme savings achieved by implementation of the observational method approach are outlined.

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