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Modelling of Vegetation on Slope Stability: Investigation of Soil Reinforcement with Roots of Three Species in an Area Prone to Landslides in Malang Indonesia

	International Journal of Scientific Research and Engineering Development (IJSRED)	Full Text:
	Published Issue : Volume-3 Issue-6
	Year of Publication : 2020
	Unique Identification Number : IJSRED-V3I6P105
	Authors : Ruwaida Zayadi, Zaenal Kusuma, Amin Setyo Leksono, Bagyo Yanuwiadi
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Abstract :

Conventional geotechnical engineering methods, such as retaining structures, soil nailing, passive pile or a combination thereof, are often applied for slope stabilization. However, this structure is less environmentally friendly and expensive and less feasible for areas that are difficult to reach by heavy equipment during its implementation. Currently, soil strengthening with vegetation roots is recognized as an environmentally friendly and inexpensive alternative to reduce the vulnerability of slopes along mountainous transportation routes to the risk of shallow landslides. Therefore, the aim of this study was to evaluate the vegetation arrangement on the slopes in the Pujon District, Malang Regency, Indonesia with a view of geotechnical engineering on the role of its root characteristics. Analysis of slope stability by modeling the distribution of vegetation roots of the heart root system as an equivalent cohesion approach, where the safety factor is calculated using the PLAXIS-2D version 86 software. Soil parameters were obtained through direct shear testing and root parameters from tensile strength tests on 3 plant species. This study produced findings that can be summarized as follows: Slopes with the same geometric configuration are initially unstable without reinforcing vegetation roots, becoming stable when reinforced by vegetation roots. Plant roots have an important role in stabilizing slopes in the study area. In general, slope stability increases as the value of root cohesion and effective depth of the root zone increase. T. ciliata species and the combination of taps and hearts. the root system of C. arabica which penetrates into the ground while grasping the surrounding soil. The results of this study broaden the knowledge about the biomechanical characteristics of the dominant species growing on sloping soils in the Pujon area with a view of geotechnical engineering.