Analysis of the Forest Road Cut-slope Erosion Control and Rehabilitation Techniques using Gabion Systems with Vegetation Base Materials

摘要

Analysis of new approaches to achieve naturally good ecological potential of forest road cut-slope by making the best use of advantages of gabion systems with vegetation base materials to prevent slope failure and erosion, in the area with highly erodible soil. Existing gabion systems can be divided into monolithic and modular system and can be divided into ten subtypes according to the purpose of establishment and combination of other measures. As a result on the monitoring of erosion amount from forest road cut-slopes in the test applications, the order of erosion amount from largest to smallest is as follows: the curved road cut-slope site where normal gabion system was established 5,840 cm~3; the control site 5,833 cm~3; the straight road cut-slope site where normal gabion system was established 5,621 cm~3; the curved road cut-slope site where the new gabion system was established 4,298 cm~3; and the straight road cut-slope site where the new gabion system 4,117 cm~3. Therefore, the result shows that the new gabion system is more effective than the normal gabion system to reduce erosion amount from forest road cut-slopes. During the study period, vegetation coverages of the straight and curved road cut-slope site where the new gabion system was established were about 56(30-85)% and about 45(28-65)%, so average vegetation coverage of the sites where the new gabion systems was established was higher than the sites where the normal gabion systems was established. Therefore, it was concluded thatthe new gabion system can be more effective for cut-slope revegetation.