Abstract: In recent years, the rehabilitation of mine ecological environment projects has developed rapidly. Slope cutting, benching, soil or rock excavation and backfilling are common engineering measures that are frequently in the ecological environment control projects of abandoned mines. The accuracy of earthwork quantity estimation of slope cutting and backfilling is an important task to determine the construction schedule. The traditional earth work quantity estimation software, including South CASS and MAPGIS, has the disadvantages of complicated calculation process, long computation time and coupling parameters etc. Switching and conversion between software modules will also increase unnecessary computational work. This paper presents a case history of using Civil 3D software for the estimation of earth work quantity. The earthwork volume can be changed according to the change of design surface. The quantity estimation results are accurate, with less adjustment operation and have a real-time display of adjusted result. It can provide more direct and comprehensive visual display effect, optimize the design to the maximum extent and save project investment.

Key words: Civil 3D, Mine Rehabilitation Project, Earth Work Quantity, 3D Model