Report of Site Visit : MRT Project 2018
On 30 March 2018, a total of 9 students from year 1, 3 and 4 of Civil Engineering (RK01) programme accompanying by two lecturers; Dr Nik Zainab Nik Azizan and Dr Shamilah Anudai@Anuar visited to MRT Centre in Sungai Besi, Kuala Lumpur. The main contractor involved with this project is MMC Gamuda Sdn. Bhd. The main objective of this site visit is to expose the students with the real construction MRT involving Sungai Buloh Serdang Putrajaya (SSP) line with 52.2km long. This project is the second MRT line to be developed in Malaysia. The line will serve a corridor with a population of aroung 3 million people from Sungai Buloh to Putrajaya including Sri Damansara, Kepong, Batu, Jalan Sultan Azlan Shah, Jalan Tun Razak, KLCC, Tun Razak Exchange, Kuchai Lama, Seri Kembangan and Cyberjaya. Under this project, a total of 36 stations, 11 of them underground, will be built. This mega project is expected to have a ridership of 529,000 passengers per day. This is expected to further improve the chronic traffic congestion currently faced by Kuala Lumpur which is expected to complete in 2022. During this site visit, we have been explained on the structure of soil condition in construction area is from Kenny Hill formation which caused challenges during the construction of station and underground track of MRT. This condition of soil had caused karst sinkholes during construction which may affect the safety of workers, project delay and increasing the construction cost. However, the engineers from MMC Gamuda manage to solve this problem using Tunnel Boring Machine (TBM) for the construction of underground tunnel. The MRT Sungai Buloh-Serdang-Putrajaya Line’s underground section passes through three distinct geological formations. In order to solve this problem the Variable Density Tunnel Boring Machine (VD TBM) has been used to slow down the sudden loss of face pressure by applying more viscous slurry to prevent blowouts to surface through underground channels. Meanwhile, the earth pressure balance machine is used to solve the Kenny Hill formation problems for this project. In the meantime, the use of VD TBM also manage to mix the various type of granite underground condition which can prevents the drawdown from the water lenses.