关键词: 排土场稳定性, 三维数值模拟, 滑坡范围

Abstract: The research focused on a certain mine′s west dumping area in Qian′an City，Tangshan City. The aim is to identify the potential landslide risk areas through comprehensive numerical simulation methods and accurately predict the landslide impact range，providing a scientific basis for mine safety man⁃ agement and disaster emergency plan formulation. By combining the finite difference intensity reduction method with the particle flow model，the pre-defined weak landslide areas of the dumping area were delin⁃ eated，and further simulation of the landslide evolution process was conducted based on the particle flow model. The results showed that due to the high slope height，protruding shape，and lack of lateral con⁃ straints on the northwest side of the dumping area，it became the area with the minimum safety factor and the maximum shear strain increment distribution，and was thus identified as the weak landslide risk zone. Through particle flow simulation，it was shown that at 15 s，the maximum speed of the landslide body was 46.9 m/s，and within 20 s it covered the southern part of the village at the foot of the slope，after 50 s it gradually accumulated，and after 70 s it stopped moving. The maximum horizontal distance of the final im⁃ pact range was 534.93 m，the downstream affected area was 415 689 m²，the maximum accumulation thickness in the village area was 37.5 m，posing a serious threat to densely populated areas such as Gao⁃ taizi Village，and emergency measures need to be taken in advance. The research achieved integrated anal⁃ ysis from risk identification to disaster prediction，providing important technical support for landslide pre⁃vention and control.

Key words: waste dump stability, 3D numerical simulation, landslide impact area