Piping Risk Reduction Measures for Mengkuang Dam Upgrading Project

摘要

Construction of the Mengkuang dam upgrading project was exposed to potential piping risk at several key areas. The variability in site geology, foundation conditions and construction materials added to the difficulty in predicting piping risk of the project. In some cases the risk factors were only uncovered during construction stage after the dam foundation was exposed. Changes to the original design, construction procedures and contract specifications had to be made in order to mitigate the risks. The techniques applied and measures implemented for risk reduction varied in each case in order to suit the actual site conditions and nature of risk encountered. This paper discussed the techniques developed and the issues related to the piping risk reduction measures implemented for the dam upgrading project. The techniques developed for alleviating piping risk was effective, judging from behavior of the dam and dam instrumentation records that were within expected ranges.