Research of the behavior for buried flexible outlet conduit under the earth dam

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The behavior of buried flexible pipe is influenced to a considerable extent by the properties of the backfill materials. Recently, geosynthetics are commonly used in retaining wall for reinforcement. And flexible pipe is used for drainage in such embankment.However, the behavior of buried flexible pipe in the retaining wall reinforced by geosynthetics is not clear.Experiments using a middle-sized steel test pit were carried out to examine the behavior of a flexible pipe buried in a reinforced embankment with settlement. A bi-axial load cell was developed in order to accurately measure the load acting on the buried pipe, and a model pipe, which was equipped with 20 such load cells was made.The result showed that with settlement of the pipe, the arching action of the backfill progress, and the vertical load that acts on the pipe greatly decreases.In addition, it was found that when backfill with sand and geogrid was used, the vertical load act on the pipe was distributed by the geogrid, hence decreasing by approximately 25% the overburden load.In the future, it is necessary to examine the effects of the installed position of the geogrid and number of layers of the geogrid.