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  Construction of Single Twin-Track Railway Tunnel in Kenny Hill Formation at Serdang, Malaysia

  KVMRT Sungai Buloh - Serdang-Putrajaya Line (SSP Line) is the second of the three Klang Valley Mass Rapid Transit (KVMRT) lines to be constructed. KVMRT SSP line traverses from Sungai Buloh through Kuala Lumpur city centre to Serdang and ends at Putrajaya. The alignment is about 52.2km in length, of which 13.5km is underground, primarily within the downtown Kuala Lumpur. At Serdang, where one part of the SSP elevated section goes through hilly areas, a 11.2m wide by 182m long mined tunnel was constructed to accommodate a twin-track railway line. It passes through Kenny Hill Formation of interbedded shale, sandstone and residual soils. The tunnel was constructed using mechanical excavation and drill & blast method, with cast in-situ concrete lining. This paper discusses the construction stages and records notable events for future references.

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