Authors: Boon, CW; Ooi, LH; Low, YY


DOI https://doi.org/10.36487/ACG_rep/1508_44_Boon

Cite As:
Boon, CW, Ooi, LH & Low, YY 2015, 'Performance of ground anchors in a Mass Rapid Transit project in Malaysia', in PM Dight (ed.), Proceedings of the Ninth Symposium on Field Measurements in Geomechanics, Australian Centre for Geomechanics, Perth, pp. 621-630, https://doi.org/10.36487/ACG_rep/1508_44_Boon

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Abstract:
Ground anchors are widely used in excavation projects in soil as active support members with pre-stressed loads. The pre-stressed loads are prescribed by the designers, and these loads are introduced to the tendons through hydraulic jacks during installation. During construction, these loads are being monitored via load cells which are installed at several selected ground anchors. This paper shows the data collected from the construction of several underground stations in a Mass Rapid Transit (MRT) project in Malaysia in which ground anchors have been used as temporary supports for the deep excavations. The prescribed lock-off loads are compared with the load cell measurements immediately after lock-off. There are two geological formations where the ground anchors were employed, namely the Kenny Hill Formation consisting of weathered meta-sedimentary rocks, and the Kuala Lumpur Limestone rock formation where the overburden above the rock head consists of alluvial deposit or mine tailings. It is found that the scatter varies between the ground anchors installed at different stations, some of which show distinct bell-shaped probabilistic distributions. Several potential sources of scatter are discussed.

References:
British Standard 1989, BS 8081:1989: Code of practice for ground anchorage, BSI.
Koo, KS 2013, ‘Design and construction of excavation works for Klang Valley Mass Rapid Transit Underground Station at Cochrane, Kuala Lumpur, Malaysia’, in Y-J Cui & F Emeriault (eds), Proceedings of the Fifth International Young Geotechnical Engineers’ Conference, IOS Press, Amsterdam, vol. 2, pp. 559-563.




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