cellular confinement system - plastic black honeycomb frame filled with small natural stones closeup. used in construction for

honeycomb cellular confinement natural design slope closeup black construction material nature texture rock safety environment engineering background system retention technology erosion control geocells channel reinforcement surface stabilizer paving industry ground geotextile geosynthetics geophysics geodynamics geology geogrids cell grid geodesy bank stabilization root protection support stone soil plastic frame flat