GROUND IMPROVEMENT USING SURCHARGE PRELOADING IN COMBINATION WITH PREFABRICATED VERTICAL AND HORIZONTAL DRAIN
2 STUs (Structural) / 2 PDUS for PEs and CEngs (All Approved and Confirmed)
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A common problem associated with urban development over compressible soft clay deposits is excessive settlements and damages to neighbouring buildings and structures. The ground improvement technique using prefabricated vertical drains (PVD) is one of the common methods to overcome this problem. The purpose of the vertical drain is to shorten the drainage path of pore water from a low permeable layer to the pre-installed drainage layer, thereby accelerating the rate of consolidation.
Surcharge pre-loading equal or greater than the expected future loading is applied to further enhance the consolidation via rapid pore water pressure dissipation through the vertical drains to achieve the tight construction schedule. A sand blanket is employed to expel water away from the vertical drains. However, in consideration of natural sand, prefabricated horizontal drain (PHD) will serve an effective and economical replacement of natural aggregates (sand and gravel) due to its excellent capacity of horizontal drainage. The presentation will cover all major aspects that contribute to successful execution of the ground improvement.
About the Speaker
Dr An Xinmei obtained both her bachelor and master degree from Xi’an Jiaotong University China and PHD degree in Nanyang Technological University, Singapore. She has over 17 years of research and practical experiences in rock engineering and underground space development including NTU PTRC-DSTA joint UTRE programme on the development of underground space for civilian and military uses, Thomson East Coast Line involving deep excavation and tunnelling, advanced earthwork project to improve the soft clay for future JRL depot, and JRL elevated viaduct projects.
She has published more than 40 papers and received Best Presentation Award for ‘Controlled Rock Blasting for Underground MRT Station Construction in Bukit Timah Granite’ from Society for Rock Mechanics & Engineering Geology (Singapore) in 2018. Dr An is currently Deputy Project Manager in Land Transport Authority, Singapore.
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