Optimize the slope stability in open pit mining extraction

Abstract

Viet Nam, open pit mining extraction creates many insecure problems, especially problems of slope instability. The slope was established from excavation peel soil process, due to the purpose of deep mining and threaten to live of the worker engineer resident when landslides occurring. Therefore, the human need for assessment and research methods excavate slope stability in open pit mining extraction and the future will develop new projects here. Geology and hydrogeology data were collected from field trips and geological survey. Important positions in the entire survey area assessed and choose to determine the build of a model. Finite Elements Method (FEM) was solved stability problems. Additionally the input parameter of the main physical properties of soil, rainfall and neighboring buildings was collected for calculation. The result of paper showed slope excavation do change the structure of and led to increased risk of landslides. Value of stable coefficient (FSKh) is 1.25 for assessment level of stability. Method of excavation does not cut slope angle of 38 degrees (1:1.25) ensures stability with deep 15m and FSjs= 1.3824. Method ot excavation does cut slope with height 5m, width 4m and slope angle of 63 degrees (1:0.5) ensure stability with deep 15m and FSf,3= 1.2538. The result of the paper is a basis for selecting the method of slope excavation to fit natural features of mine. Method of excavation does not cut slope with slope angle of 38 degrees ensures stability but it does not fit with the small area of mineral mine, because of doing not open pit mining extraction. Method of excavation does cut slope with height 5m, width 3m and slope angle of 63 degrees is suitable for the large and small area of mining but excavating technique is high than the method of excavation does not cut slope.