The processing facility location-allocation problem for tunnel slag during tunnel construction

In this paper, we consider the process of resource utilization of tunnel slag, and propose a 'regional self-balanced' reverse logistics network. We propose a location-allocation model that takes the uncertainty of availability, various types of output, various types of demand, and various types of facilities into account when solving the location-allocation problem for facilities in the network. According to our research, we obtain a feasible model and algorithm for use in the engineering field, and we find that the logistics cost can be decreased by appropriately increasing the number of facilities and choosing the locations of facilities based on scientific principles, thereby lowering the total cost. We determined the parameters of the algorithm by Taguchi's analysis and verified the effectiveness of the algorithm by comparing it with the exact algorithm and other heuristic algorithms. By analyzing the impact of the availability of tunnel slag on the site selection of facilities, we obtain policy recommendations on the number of facilities.