Evaluation of Erosion Resistance Capability with Adhesive Soil Seeding Media

This paper describes vegetation based soil-media hydroseeding measures that have been previously applied as slope revegetation methods show problems such as insufficient binding force, drying, and insufficient organic matter. In particular, in the case of slope faces in regions where scattering is severe, a vicious circle exists in which remarkably low vegetation cover rates and increases in withering rates over time lead to further decreases in vegetation cover rates, which lead to further increases in erosion and scattering. Therefore, in the present study, environment friendly soil stabilizers were applied for resistance against erosion or scattering and engineering evaluations such as long-term immersion tests and flow resistance tests were conducted to determine appropriate mixing ratios. According to the results of long-term immersion tests utilizing environment friendly soil stabilizers and existing greening soil based materials, 100% collapse occurred at 30 hours and 40 days in the case of soil stabilizer mixing ratios of 0% and 2%, respectively. While the original form of the samples remained intact until the experiment was completed in the case of mixing ratios exceeding 4% indicating that 2% or higher soil stabilizer mixing ratios could affect the maintenance of forms even under extreme conditions. In addition, artificial rainfall tests were conducted on 40, 45, and 55 degree slope faces to evaluate the structural stability of vegetation based materials. Flow resistance tests were conducted on soil stabilizer mixing ratios of 0, 4, 8% to evaluate erosion resistance capability. Based on the results of the tests, environment friendly soil stabilizers applied for prevention of scattering or resistance against erosion by rainwater are considered to provide large effects to reduce losses and loss rates showed a tendency of decreasing rapidly when soil stabilizers were mixed.

접착성 식생기반재의 침식저항능력 평가

기존의 비탈면녹화공법인 식생기반재취부공법은 결합력의 부족이나 건조화, 유기물의 부족 등의 문제점들을 보이고 있다. 특히 비산이 심한 지역의 비탈면은 식생피복율이 현저히 떨어지고 시간이 경과함에 고사율이 증가되어 피복율이 더 저하되고 또다시 침식 및 비산이 증가하는 악순환이 이루어지고 있는 상황이다. 따라서 본 연구에서는 침식이나 비산에 저항하기 위해 친환경 토양안정재를 적용하고, 적정 배합비 결정을 위해 장기침수시험과 유수저항시험을 실시하였다. 친환경토양안정재와 기존의 녹화토기반재를 활용한 장기침수시험결과, 토양안정재의 혼합율 0%는 30시간, 2%는 40일 후 100% 붕괴가 발생되었으며, 4% 이상의 혼합비에서는 실험종료시까지 시료의 원형이 그대로 남아 있어 2% 이상의 토양안정재가 극한 조건에서도 형상을 유지하는데 영향을 줄 수 있는 혼합비임을 확인하였다. 또한, 식생기반재의 구조적 안정성을 평가하기 위해 인공강우시험을 40, 45, $55^{\circ}$ 경사비탈면에 대해 실시하였으며, 토양안정재의 혼합비 0, 4, 8%에 대해 유수저항시험을 실시하고 침식저항능력을 평가하였다. 실험결과, 토양안정재의 혼합에 따라 유실률이 급격히 감소하는 경향을 보이는 등 비산을 방지하거나 우수에 의한 침식에 저항하기 위해 적용한 친환경 토양안정재가 큰 유실감소효과를 거둘 수 있을 것으로 판단된다.