Design Ways of Vegetation Work and Drainage System for Bioengineering on the Landslide Slope at Gopini in Bhutan
摘要
This article is a teaching tool focusing on the bioengineering efforts applied to the road slope in Gopini, southern Bhutan, where a previous landslide occurred. Following the landslide event, gabions were constructed at the base of the slope. Still, some gabions protruded toward the roadway due to the earth pressure exerted from behind. Therefore, it was essential to ensure the slope’s stability and mitigate erosion caused by heavy rainfall. A functional drainage system was implemented on the surface, accompanied by efforts to establish vegetation. The drainage system includes French, Cascade, Berm, Toe drains, and energy dissipators. This teaching tool article utilized bioengineering techniques such as pot, spread, and sandbag planting. For spread planting, a laminate sheet was made by layering a plastic mesh net between two jute nets, resulting in a three-layer design. Pot planting involved tubes, each measuring 40 cm in diameter and 50 cm in length, placed next to the upper section of Berm drains Br. 2 and Br. 3, which also functioned to help alleviate earth pressure. Sandbag planting was conducted concurrently with pot planting in areas vulnerable to landslides.