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  Ground Improvement for Shallow Overburden of Bored Tunnels: Case study of 8th Drive in Klang Valley MRT Line 2

  Following the rising of underground spaces utilization in urban cities, it is inevitable to mine underneath public roads of heavy traffic flow. The 8th drive of SSP Line 2 includes a final stretch of 240m of shallow overburden which sits below East West Link Expressway that caters for high volume of traffic. Deep Soil Mixing (DSM) ground treatment method suitable to the local geological conditions is adopted for the purpose of controlling potential deformations and distortions of tunnel lining. In this paper, we discuss ground treatment methods adopted for this shallow overburden section, construction sequences, site operation challenges and solutions. The ground treatment works are divided into 5 stages, where 4 of the stages are preceded by traffic diversion to perform DSM works across the expressway. Challenges to the ground treatment works arise when construction waste and multiple boulder layers are found within the treatment area, adjacent to expressway in use.

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