Geotechnical control for artificial ground freezing works in tunnel projects in Hong Kong

摘要

Artificial ground freezing has been used successfully for ground treatment to facilitate constructionrnof tunnels and adits and break-in and break-out operations in TBM drives in soft ground in a number ofrntunnel projects in Hong Kong. Many of these projects are constructed in densely populated urban areas withrndifficult ground conditions. In the interest of public safety and to manage and control the risk involved, artificialrnground freezing works, which form part of the tunnel works construction, are subject to geotechnical controlrnexercised by the Geotechnical Engineering Office of the Civil Engineering and Development Department. Therngeotechnical control for artificial ground freezing works in government tunnel projects in Hong Kong exercisedrnat different stages of the projects and some of the geotechnical control measures and practices applied to arnrecently completed project are presented in this paper.