Abstract: In line with the upper-bound limit analysis method and strength reduction technic, a method of optimizing the position of stabilizing piles in reinforcing construction solid waste (CSW) landfill slopes is proposed through genetic algorithm combined with nonlinear programming SQP (Sequence Quadratic Program) to determine the optimal position of stabilizing piles. A CSW landfill slope in Shenzhen is taken as the case slope. Research results evince that at a given required safety factor, the location of stabilizing piles have remarkable impact on the anti-sliding force, the pile length above slip surface and the critical slip surface. In addition, the anti-sliding force, the pile length above slip surface and the range of critical slip surface under heavy rain condition are greater than those under natural condition. Moreover, the local stability of the case slope is discussed. The optimal locations of stabilizing piles for the case slope under natural and heavy rain conditions are around the position where ε=0.3 and 0.6, respectively. The results offer technical guidance and theoretical support for the optimal design of the position of stabilizing piles in CSW landfill slopes.

Key words: construction solid waste landfill slope, optimal pile position, upper-bound limit analysis method, strength reduction method, genetic algorithm