ABSTRACT
Underground construction works for KVMRT Line 2 in Kuala Lumpur includes tunnel boring works, excavation works for shafts and stations, and mine tunnel works for cross-passage and adits. This paper will present the instrumentation and monitoring for tunnelling works from Bandar Malaysia North Station to Chan Sow Lin Station which tunnelling in Alluvium and Limestone formation. Generally, all above ground and underground structures (e.g. SMART tunnel and SBK Line 1) that located within minimum monitoring zone are to be instrumented especially the sensitive structures located on top or nearby to the tunnel alignment. Manual observation/surface monitoring by manpower is also adopted during tunnelling works in order to take immediate action and provide first-hand information to the respective parties in the case of excessive settlement/ sinkhole formation (especially tunnelling in Limestone formation). This paper will share the instrumentation monitoring methods and concepts of the proposed instrumentation monitoring works. The instrumentation results for ground and buildings along this tunnel alignment will be presented and discussed.
