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  An underground solution for a collapsed hydraulic conduit affected by an active landslide in Costa Rica

  In a hydroelectric plant in northern Costa Rica, affected by major landslides, an evaluation was required to assess the possibility of stabilizing the ground to save the pipeline. The rate of displacement of the ground in the pipe vicinity has reached the maximum of 10 cm per month, which directly affects the pipeline, which has had to realign several times to keep operating. However, the magnitude of the movements is such that the risk of operation output rose significantly. The geotechnical study carried out indicated that the possible ground stabilization measures are extremely expensive, so it was proposed to build a new pipeline completely underground, through a vertical shaft 50 meters deep and a tunnel of 585 m length. This article discusses the condition of the land and the analysis and design of the underground structure proposed as solution to the problem.

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