| Autor: |
D. J., Lees, J. L., Sánchez, C., Yi, S., Banda, D., Denman, M., Perumal |
| Předmět: |
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| Zdroj: |
EA National Conference Publications; 2023, p573-580, 8p |
| Abstrakt: |
The Mahaweli Water Security Investment Program (MWSIP) is a major project in Sri Lanka to provide water resources to the dry North-East of the country and enable two crops of rice per year. The current phase includes the construction of 76 km of waterway via canal, aqueduct and tunnel. Contract UEC-ICB-2A is the biggest component of this current phase and includes the excavation of 27 km of underground waterway which will be the longest in South East Asia when complete. The tunnels are being constructed by two purpose built Double Shielded Chinese TBMs of 7.6 m diameter. The construction is being carried out by China State Construction Engineering Corporation (CSCEC) for the Ministry of Mahaweli. The Engineer is a JV called the Project Management Design and Supervision Consultants (PMDSC) and the Client is represented by a Project Management Unit (PMU) and a Project implementation Unit (PIU). During the economic crisis in 2022 the Country suffered many shortages including diesel and explosives. The original plan was to excavate a full launch chamber for the TBM from the bottom of the 23 m deep, 26 m diameter Northern Start Shaft. However, due to shortages of explosives and limitations on imports it was instead decided to launch the TBM in a short mode of only 65 m length and then to stop and complete the installation and commissioning of the TBM once the tunnelling had reached 200 m. This paper will describe the actions taken to promote the tunnel progress and to achieve the best result for the TBM in very challenging circumstances. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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