Underground support for Xe-Pian Xe-Namnoy hydropower project, Lao PDR

Conference Dates

September 3-6, 2017


1. INTRODUCTION Xe-Pian Xe-Namnoy Hydropower Project is situated in Lao PDR overlapping between Champasak Province and Attapeu Province. Parties involved are the Developer, Xe-Pian Xe-Namnoy Hydroelectric Power Co., Ltd. (PNPC); the EPC Contractor, SK Engineering & Construction Co., Ltd. (SK) from South Korea; the Subcontractor for rock excavation by drilling and blasting method and concrete works, Right Tunnelling Co., Ltd. (RT) from Thailand. Rock excavation by drilling and blasting comprises two types of circular shaped concrete lined tunnel, one is Low Pressure with Tunnel length of 2,000 m., diameter of 5.0 m. and the other is High Pressure Tunnel with diameter of 4.6 – 3.6 m., length of 1,660 m. Geological condition of tunnel site are mainly siltstone interbedded with sandstone and mudstone. By RMR rock mass classification, the rock is classified as fair to good rock except for the tunnel portal and fault zone as poor rocks.

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