Optimization Of Truck Development Haulage System At Bottom Of Surface Mine During Internal Dumping Period

Truck haulage system is widely used in surface mines for its flexibility and good adaptability. The transportation cost increases with the increase of the international price of diesel as well as the mining cost. The transport system is established through the working group and the inner dump has a great benefit in reducing the transport work, haulage cost as well as reducing carbon dioxide emissions. Such green mining can achieve.Development haulage systems and their characteristic are introduced in the paper. Haulage system influence factors and patterns of bridging are put forward based on the haulage system patterns used in mines at home and abroad are introduced.Firstly, the bridge deck location model was established and the location of horizontal bridge deck was confirmed on basis of minimum transport work of tripping benches. The internal dumping distance model of overburden model was established as well as the distance model after bridging. Then the transport work model was concluded.The calculation for 6 segments unit cost in a cycle of truck was made based on the schematic diagram for traction-speed-climbing ability of 797 B at wheel edge. The results show that the cost for heavy truck climbing is the highest. It will highly reduce the recycling cost if the climbing distance of truck reduces. Using the simplified model, the bridge volume is divided into calculating the re-stripping volume and the establishment cost. A new formula for calculating the width of deck was put forward. Change curve of bridge stability factors with m0 was obtained in use of Geo-slope software with reinforcing slope model under point load by truck.The new bridge model of economic loss was put forward in this paper which was combined with previous research results. That is, bridging economic loss consists of 3 sections, which are the cost of overburden transport work increasing during the bridge interruption, the cost of overburden transport work decreasing of the reverse internal dumping and the cost of bridge establishment. Then the best shift step for bridging was obtained. The reasonable length for work line and the service level were obtained on basis of bridging transport work model. The results show that, double bridging at bottom of open pit mine has larger range than single bridging, while, the height of service stage is lower.Take Haerwusu surface coal mine for instance to verify the correctness of the model. The results show that, single bridging and double bridging are both applicable in Haerwusu open-pit coal mining conditions. The minimum deck width is 24.4m for single bridging. It can serve as many as 4 stripping benches and reduce 93.90794 million yuan as well as 2730.08 t CO2 emission. The double bridging can serve as many as 2 stripping benches and reduce 33.18647 million yuan as well as 1998.85 t CO2 emission. The double bridging in Haerwusu can reduce the cost of coal with 7.06 yuan per ton, which is the optimal solution.