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  Construction Challenges of Urban Tunnelling in Klang Valley, West Malaysia: Case Study of 8th Drive in SSP Line

  Underground construction has been gaining wide attention in recent years to alleviate traffic congestions in urban areas. Twin bored tunnels using Earth Pressure Balance (EPB) shield launching from Bandar Malaysia North Station towards South Portal is the 8th drive of Klang Valley MRT Line 2. Geology along tunnel alignment comprises of KL Limestone Formation and Kenny Hill Formation. Different methods of ground improvement works are undertaken for TBM break-in and break-out blocks, intervention blocks and shallow overburden according to varied geological conditions. EPB shield tunnelling is challenging due to encounterance of hard rock in the face, mixed face, karstic limestone condition which potentially cause sinkholes formation and transitioning between hard to soft rock and vice versa. Before TBMs launched, rock bolts removal for Southbound tunnel and SBP removal for Northbound tunnel are conducted due to changes in design alignment. Other challenges include presence of sensitive building structures along tunnel alignment which include double track of Malayan Railways Limited and piles of Express Rail Link.

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