Stability Analysis Of Dongbang Slope In The Copper Street-Manjiazhai Stope Of Dulong Tin Mine In Southeastern Yunnan

The Dulong mining area in Maguan County,Yunnan Province is one of the important zinc-tin mineral resources in China.With the expansion of the production scale of the mining area,a series of hydrological and engineering geological problems have emerged,which has caused serious damage to the safe production in the later stage of the mine.Bad effects.In view of this situation,this paper takes the Dongbang of the Tongjie-Manjiazhai open-pit mining site as the research object,and studies the typical slope stability of Dongbang,in order to provide a reliable geological basis for the safety of the mining project in the later stage of the mining area.The Tongjie-Manjiazhai open-pit mining site is located in the south of Laojun Mountain.The tectonic unit is located in the southwestern margin of the South China fold,the southeastern Guizhou fold belt,and the Laojunshan complex anticline at the southern end of the Wenshan-Maguan uplift.The quality of the mining site is extremely complex,and the distribution of metamorphic rocks is wide.The stripping level of the current stope is930~1180m.As the stripping of the stope progresses from south to north,the height of the slope in the Dongbang area of the site gradually increases,forming a high-level slope with multiple stages of combined steps.Based on the collection of previous research data,this paper carries out engineering geological survey and survey in the stope area,ascertains the geological environment conditions of the landslide area in the study area,and deeply analyzes the basic characteristics,influencing factors and stope area of the Dongbang landslide in the stope.The stability division and the cause of the landslide,and the stability calculation and numerical analysis of the Dongbang slope of the stope were evaluated by the limit equilibrium method and numerical simulation method.The safety of the mining area Dongbang was evaluated and the corresponding prevention measures were put forward..The results show:Most of the landslides in the Dongbang slope are mica schist and two-cloud quartz schist,which are affected by strong weathering.Most of them have broken and scattered structures.The slopes are stepped and the slope is steep,which is affected by faults and secondary structures.The joint fissures are relatively developed,and it is easy to cause landslides and collapses under the influence of bad weather such as heavy rain.The sliding surface is arc-shaped along the main axis;the stope is divided into ?,?,?,and ? zones,of which ?,?,and ? are divided into two sub-areas A and B,according to the lithological characteristics of each zone and In the form of landslide,?,?,?-A,and ? are the worst stability regions,and?-A is the sub-stable region.The rest are stable areas.The stability of the Dongbang slope is mainly affected by the topography and geomorphology,the geological rock group of the slope engineering,the permeability of the soil layer,and the mining activities.The simulation results show that the slope stability decreases with the increase of the slope height and the slope angle;...