A method for reliability-based multi-objective optimization design of sliding resistant components in construction waste slope

The quantity and scale of construction waste slopes increase rapidly with the development of urban construction, causing much concern on the prevention and control of construction waste slopes. The construction waste slope engineering is affected by artificial layering and the uncertainty of properties of the layered soil. To handle this problem, a multi-objective optimization design method of sliding resistant components in construction waste slopes is proposed. With this method, pre-construction of sliding resistant components at the bottom of the landfill is adopted. Consider the influence of different reinforcement strength on the estimated failure loss of construction waste slopes, the failure loss, stable security and the construction cost of construction waste slopes are selected as design objects. Based on the multi-objective optimization theory, the Pareto front is determined. Through calculating the knee point on this Pareto front, an optimal design of the sliding resistant components is derived. The method proposed herein is applied in a construction waste slope in Shenzhen and the result indicates that two groups of the sliding resistant components with 3 m and the 5 m are pre-constructed at the front of the slope to reinforce the landfill. With adopting the presented design, the stability, failure loss and reinforcement cost of the slope can be optimally balanced.