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Received: 5 February 2018 Accepted: 29 May 2018 Farmland drainage ditch slumps restrict recirculation of water resources in the irrigation area of Ningxia in China. To address this problem, soilbags are applied for farmland drainage ditch slope protection, because of their double efficacy in solid slope collapse prevention and water purification. Variations in the mean flow rate, weight of soil passing through the geotextile, and gradient ratio were analyzed based on filtration criteria. Filtration and permeability performance of soilbag technology was studied using a clogging and permeability test, which was performed with gradient ratio and penetration test instruments. Different hydraulic gradients and building structures were tested. The clogging test shows that a rapid increase in the hydraulic gradient can decrease the permeability coefficient of the soil-geotextiles system by 77.99%, lower filtration, reduce soil content per unit area, and increase leakage. The influence of the size of the soilbag (two different sizes were tested) and their arrangement was investigated. Penetration tests demonstrated that an overlapped structure with staggered joints significantly reduced the overall permeability coefficient. With a smaller bag size, the permeability coefficient of structure was larger. The permeability coefficient ratio with different bag arrangements was as high as 90.75%. The results indicate that flow through a soilbag structure is governed solely by the gaps between neighboring containers and that flow through the soil in the containers can be neglected. The arrangement of soilbags thus strongly affects the permeability of the structure. Combining these results with a masonry plan for slope protection in engineering applications with soilbags, the equivalent permeability coefficient of the soilbag slope protection increased 100% and seepage pressure decreased 50%, which effectively improved the stability of the slope protection. These results provide a theoretical basis for further engineering applications.

Permeability and stability of soilbags in slope protection structures