露天矿下伏采空区群影响下边坡稳定性研究

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中图分类号：TD824.7 文献标志码：A

Slope stability under influence of underlying goaf groups in open-pit mines ZHAOHaifeng1，LIULikel，WANGLijie1，JIALan²，CAOBo²，GUOJiaxin² （1.Dameigou CoalMine，Yima Coal IndustryGroupQinghai YihaiEnergyCo.，Ltd.，Delingha8170o，China; 2.College ofMining，Liaoning Technical University，Fuxin1230oo，China）

Abstract：This studyaims to investigate the influence of underlying goaf groups on slope stabilityunder the open-pit-underground combined mining mode.Taking the composite slope of the west dump and pit of the Dameigou Open-pit Coal Mine as the research object，six underlying goafs of working faces beneath the W1 section and four underlying goafs beneath the W2 section Were selected ascalculationsections.UDEC numerical simulation software was used to sequentially simulate and analyze the displacement and shear strain evolution of overburden after the formation of each working face goaf，and the development characteristicsof the caving zone， fracture Zone，and bending subsidence Zone formed by the goaf group were identified.Based on the distribution characteristicsof the "threeZones"anengineringgeological modelof theslope wasestablished，andtheslope stability coeficients with and without considering the influenceof the "three Zones"were calculated using the limit equilibrium method.Based on theMohr-Coulomb criterion，numerical simulations of slopestability were conducted to reveal the landslide mechanism under the influence of goaf groups.Theresults indicated that the overlyingstrata above the goafs exhibited trapezoidal caving，and with an increase in the number of goafs，a superposition efect occurred，significantly expanding thecaving rangeof the overlying strata.The potential landslide modes of the slopes along the Wl and W2 sections were circular sliding.The calculated slope stability coeffcients of the W1 and W2 sections were identical when goaf groups were not present and when goaf groups were present but the "three zones" efect was not considered， with values of 2.038 and 2.634，respectively. After considering the "three zones" effect，the stability coeficients decreased to 1.637 and1.685，respectively， confirming that the "three zones" effect formed by goaf groups was a key factor affecting slope stability.

Key words： open-pit mine; open-pit-underground combined mining; goaf groups; slope stability； "three zones" effect

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