EFFICIENCY OF VARIOUS PERFORATED PIPE CONFIGURATION IN SLOPE DRAINAGE SYSTEM

VONG, PIK QUAN (2018) EFFICIENCY OF VARIOUS PERFORATED PIPE CONFIGURATION IN SLOPE DRAINAGE SYSTEM. [Final Year Project Report] (Unpublished)

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Abstract

Horizontal drains are defined as the holes that drilled into a cut slope or embankment and cased with a perforated metal or slotted plastic liner (Royster, 1980). The effectiveness of the horizontal drain is affected by several factors, such as the length of the pipe, location, spacing, perforation and others. However, there is not much research on the effect of different combinations between perforation pattern and types. Hence, the purpose of this study is to determine and study the effect of perforation patterns and perforation types on slope drainage system on the performance of the horizontal pipe. Several soil tests are conducted before the experiments as to determine the characteristics of the soil sample. There are four experiments conducted with different pipe perforation patterns and types, Experiment 1 (Pattern: Straight, Type: Partial); Experiment 2 (Pattern: Staggered, Type: Partial); Experiment 3 (Pattern: Straight, Type: Full); Experiment 4 (Pattern: Staggered, Type: Full). 25mm diameter with length 60cm HDPE pipes are used throughout all the experiments. The pipes are enveloped with a layer of non-woven geotextile and with quarry gravel acts as the filter material. Pipes are installed with a slope of 5o from horizontal in the model box with dimensions of 0.25m (w) x 0.56m (l) x 0.25m (h). Rainfall simulator with full cone sprinkler is used to introduce the rainfall event. From the experiment conducted, it can be concluded that partially perforated pipe with straight perforation pattern has the highest discharge, which is 1.017 x 10-5 m3/s. However, in term of the amount of sediments collected, the partially perforated pipe with staggered perforation pattern in Experiment 2 has the lowest amount of sediments collected, which is 0.049g. Throughout this study, in term of perforation pattern, straight perforation pattern and staggered perforation pattern prove to have their own pros and cons. Meanwhile, in term of perforation type, partially perforated pipe is more effective than fully perforated pipe in term of the discharge and the amount of sediments collected

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