Abstract
In light of the complex and dynamic mechanical properties of evolving weak strata in open-pit mines, and the consequent difficulty of determining their mechanical parameters, this study uses the ultimate balance theory, along with the back analysis method combined with monitoring data on field displacement, to carry out parameter inversion using the FLAC3D numerical simulation software. The edge slope of a working pit of the Weijiamao open-pit mine was used as research object to this end. As the results obtained by the constitutive model were consistent with the field monitoring data, the evolving weak strata in the slope and the position of the landslide in the mine could be obtained. The landslide was directed northeast. The mechanism of the edge slope of the working pit was identified as unloading shear failure, and the feasibility of the method of parameter inversion was verified. The internal friction angle ϕ and cohesion C of evolving weak strata in the slope of the open-pit mine were also obtained, where this compensated for the deficiency of laboratory tests and enabled the transformation from qualitative to quantitative analysis. This can provide a reliable basis for the safe operation of open-pit mines.
Highlights
As the depth of open-pit mines increases with developments in mining technology, the stability of the slope of the mine becomes important
In light of the complex and dynamic mechanical properties of evolving weak strata in open-pit mines, and the consequent difficulty of determining their mechanical parameters, this study uses the ultimate balance theory, along with the back analysis method combined with monitoring data on field displacement, to carry out parameter inversion using the FLAC3D numerical simulation software
The edge slope of a working pit of the Weijiamao open-pit mine was used as research object to this end
Summary
As the depth of open-pit mines increases with developments in mining technology, the stability of the slope of the mine becomes important. Theory to conduct an inversion analysis of the parameters of the strength of deformed rock mass by using a safety factor, and accurately determined its strength-related parameters. This can provide a parametric basis for an analysis of the stability of deformed rock mass and even the slope. Features of the evolving weak layer make it difficult to extract the ideal sample from it through drilling and sampling, because of which it is difficult to obtain more accurate mechanical parameters of the layer in laboratory tests This makes it impossible to quantitatively analyze the stability of the slope of open-pit mines. It is important to study the parameter inversion and means of determining the location of the evolving weak layer of the slope of open-pit mines
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