Considerations of Deep Excavation in Kenny Hill and Kuala Lumpur Limestone Formations at the KVMRT

Abstract

This paper presents the basic design considerations for deep retaining system for the construction of deep underground stations in a highly built up area within the Kuala Lumpur Limestone and Kenny Hill Formations. The KVMRT underground stations design criteria and design objectives are briefly discussed. The selection of type of retaining systems, strutting system, construction sequences and design parameters are elaborated with respect to a design and built contract. Some of the challenges encountered in design and construction as well as the instrumented performances of the retaining system are presented. Among the standout challenges are proximity to old and sensitive buildings, removal of pre-existing structural obstructions, multi-stage constructions, groundwater drawdown control and settlementmitigation measures. The measures adopted to address some of the above challenges are briefly discussed