| Puyang Coal Mine was founded in 1985.The No.1 dumping site of Puyang Coal Mine has been used as the main dumping and dumping site since the mine was built.It has been used for 34 years.The design of the No.1 dump site of Puyang Coal Mine is 1100 m,and the current height of the abandoned soil is 1030 m.It is the feasibility of studying the current stability,stress and strain characteristics of the No.1 dump in Puyang Coal Mine and the feasibility of continuing the earthmoving operation.In this paper,the research on the slope stability of No.1 dump site in Puyang Coal Mine is made through field research and simulation calculation.The specific research contents and results are as follows:The engineering geological conditions of No.1 dumping site in Puyang Coal Mine were analyzed in detail.The original topography of No.1 dumping site in Puyang Coal Mine is a gully extending from south to north,with the terrain being high in the south and low in the north.The stratum in the No.1 dump site of Puyang Coal Mine is from the new to the old: artificial active layer(prime fill),Quaternary residual slope(silt clay,clay),Cambrian Shangtong Bocatian group(Limestone).There are no faults in the dumping area,and there are no caves in the northern slope.There is no surface water distribution.The hydrogeological conditions are below860 m and the springs are dense.The limit equilibrium method was used to calculate the slope stability coefficient of Puyang coal No.1 dumping site,and the stability of the dump slope was preliminarily evaluated based on the actual displacement monitoring data.The calculation results show that the stability coefficient of the 3-3' section of the dumping field is 1.08 under natural conditions,and the stability coefficient under heavy rain conditions is 0.98.The displacement monitoring data shows that there is no evidence of slippage in the dumping site,and the slope of the dumping site is temporarily in a stable state.The true three-dimensional geological model of No.1 dumping site in PuyangCoal Mine was established and the stability coefficient and stress-strain characteristics of the slope were simulated by self-made reduction strength method.According to the results of the simulation calculation,two potential sliding bodies are delineated.The simulation results show that the overall stability coefficient of No.1dumping site of Puyang Coal Mine under natural conditions is 1.177,and the stability coefficient of heavy rain conditions is 1.006.The stability coefficient of potential sliding body under natural conditions is 1.147,heavy rain conditions.The lower stability coefficient is 1.999.The plastic zone map indicates that the plastic zone of the potential sliding body is mainly distributed at 30 m below the surface and below the surface.It is speculated that shallow landslide may occur.The stability coefficient of potential sliding body No.2 under natural conditions is 1.013,and the stability coefficient under heavy rain conditions is 1.006.The plastic zone of the potential sliding body is mainly distributed at the surface and fill and junction.It is speculated that traction landslide may occur.The results of this paper indicate that the No.1 dumping site of Puyang Coal Mine is currently in a stable state,but its stability coefficient is at the critical value of slippage.It is prone to landslide in the case of continuous rainfall.Therefore,this paper considers No.1 dumping in Puyang Coal Mine.The site does not have the conditions to continue the earthmoving operation. |
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