Volume 29, Issue 5, 2020
DOI: 10.24205/03276716.2020.1150
Study on the Slope Stability of Mine Wall in Open Pit Mines for Paste Backfill of Cut-and-Backfill Mining
Abstract
The paper presents studies on the slope stability of mine wall in open pit mines for paste
backfill of Cut-and-Backfill mining. The simulation of coal seam excavation under the mine
wall, which has studied the slope stability of the coal was excavated and then uses paste
backfilling, by using the Cut-and-Backfill mining method and analysis of the influence of
coal mining under the mine wall that affecting the slope. Studying distortion and stress
distribution and is clouding the properties of the reclamation materials that are suitable
to support the mine wall from the failure of slope and reduced surface subsidence.
Subsequently, the paper uses the Shenyi coal mine to study and develop research on Cutand-Backfill mining technology, how to efficiently use the remaining coal resources under
the mine wall. By creating a small model and numerical model using the Abaqus / CAE
program to compare the characteristics of the movement and distribution of stress
received from the roof of the mine wall. Including evaluating the stability of the slope
during the coal seam excavation and the paste backfill period. The research conclusion
indicated that Cut-and-Backfill mining is a method that can reduce the failure of the mine
wall and prevent the slope stability of the mine wall that causing displacement and
acceptable subsidence. Compared between digging coal seam by leaving coal pillars and
digging coal pillars and then paste backfill.
Keywords
open pit coal mine; slope stability; replacement mining and paste backfill mining; evaluation of slope failure