Abstract: Small cross-section shield-driven tunneling projects are characterized by minor diameters. Consequently, it is not possible to deploy large-scale equipment for excavation and cleaning-up operations. With consideration to pressurized slurry balance principles of shield machine, and with the background in clean-up of certain small cross-section collapse from shield-driven tunneling project, this paper reviews the techniques related to the cleaning-up of small cross-section collapse. In the newly developed program, sludge shall be agitated in water before pumping to sludge-water separator on ground surface. Upon completion of sludge separation, produced water shall be pumped back to the tunnel for reusing. The program involves water pumping by using vertical wells, water discharging through tunnels, sand discharging through upward and downward sections of tunnels, construction of safe doors in the tunnel and other techniques. The newly developed technique is applicable for cleaning up of materials with high solid contents and with uneven distribution of solid particles. In addition, the program is applicable to the working conditions with environmental humidity of 95%, temperatures from －20 ℃ to 50 ℃ and with lower demands for human operators and water consumption. At the same time, the program may have high accessibility and applicability in cleaning-up operations in working conditions similar with limited spaces.