Application Research on Slope Repair Process Method in Taitou Qianwan Coal Mine

Aiming at the technical difficulties of highly exposed and difficulty in vegetation directly planting in the 78° high and steep rock slope in Taitou Qianwan Coal Mine, the traditional spray seeding technology has significant defects such as matrix loss rate of up to 60% and poor moisture retention ability, the matrix moisture content drops to below 10% after 3 days of rain, resulting in a vegetation survival rate of only 30%-50%, etc. A composite restoration technology of 45° inclination angle drilling (with a diameter of 200 mm, a depth of 700 mm)+matrix soil (containing 16% edible mushroom waste residue, 20% organic components such as cow manure) filling+small leaf wintercreeper planting is studied and proposed. By drilling and filling the matrix soil, the matrix loss rate is decreased to within 5%, and the matrix moisture content can still be maintained above 25% after 7 days of rain, the core difficulites of difficulty in matrix adhesion and poor moisture retention in traditional restoration are systematically solved. Through two years of continuous maintenance, the rock slope has been fully restored to green, with a vegetation survival rate reaching 100%, effectively solving the soil erosion problem and providing a replicable technical example for ecological restoration of similar mines.