Correlations of geotechnical monitoring data in open pit slope back-analysis -A mine case study

Abstract

Geotechnical monitoring plays an important role in the detection of operational safety issues in the slopes of open pits. Currently, monitoring companies offer several solutions involving robust technologies that boast highly reliable data and the ability to control risky conditions. The monitoring data must be processed and analysed so as to allow the results to be used for several purposes, thereby providing information that can be used to manage operational actions and optimize mining plans or engineering projects. In this work we analysed monitoring data (pore pressure and displacement) and its correlation with the tension and displacement of the mass of an established failure slope calculated using the finite element method. To optimize the back-analysis, a Python language routine was developed using input data (point coordinates, parameter matrix, and critical section) to use software with the rock mass parameters (cohesion, friction angle, Young's modulus, and Poisson's ratio). For the back-analysis, the Mohr-Coulomb criterion was applied with the shear strength reduction technique to obtain the strength reduction factor. The results were consistent with both the measured displacements and the maximum deformation contours, revealing the possible failure mechanism, allowing the strength parameters to be calibrated according to the slope failure conditions, and providing information about the contribution of each variable (parameter) to the slope failure in the study area.

Observation Method in the Control of Stacker Capacity Under Landslide Hazard – A Case Study

“…In surface mines, analyses of the results of geotechnical measurements represent one of the methods for the continuous monitoring of the safety of mining operations. Observations of the factors which may contribute to slope failure, for example, surface and subsurface displacements, or changes in the pore-water pressure and groundwater level, allow the behavior of earth masses during stacking operations to be predicted and controlled on an ongoing basis (Silva et al, 2021).…”

“…Based on the performed analysis and the assumed evaluation criteria, appropriate measures can be taken to ensure adequate safety and optimize mining processes (Jiang & Feng, 2011;Silva et al, 2021). In order to enable appropriate actions aimed at an optimal operation of the stacking machine without deteriorating the geotechnical conditions, the readings from the measuring instruments must be compared with the critical and the warning values defined in the previous step.…”

Study on the deformation law of the construction of the cutoff wall of the reservoir

“…The field monitoring and analysis of the cutoff wall in Daning Reservoir is a typical geotechnical safety monitoring and analysis. At present, the safety monitoring and data analysis method in geotechnical engineering is widely used [ [14] , [15] , [16] , [17] ], its performance is closely related to the design scheme, such as the verification and perfection of the arch dam test load method theory [ 18 ], verification of the stress and strain characteristics and calculation assumptions of mass concrete [ [19] , [20] , [21] , [22] ], analysis and determination of permeability and deformation of cutoff wall [ [23] , [24] , [25] ], stability verification of the foundation pit supporting structure [ [26] , [27] , [28] ].…”

Surface Deformation Prediction Model of High and Steep Open-Pit Slope Based on APSO and TWSVM

“…The surface deformation of the mine slope is a common phenomenon in the mining process, but when the slope deformation is accumulated to a certain extent, it will cause great damage to the mining area, and even geological disasters such as cracks, collapses, and landslides [1]. Due to the influence of many factors, such as the meteorological environment, the geological structure, and the activities of artificial mining, the slope deformation prediction model is generally a complex and nonlinear model [2]. The open-pit slope surface deformation prediction model of is established to analyse the coupling relationship between the factors that affect slope deformation and the amount of direct deformation, so as to predict and warn the main deformation of the slope in advance, and to take disaster prevention measures in advance to ensure the safety of personnel and properties.…”