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Abstract
Cemented paste backfill (CPB) is the primary solution to improving the safety of continuous mining. The interaction between rock mass and backfill is an important indicator of backfill stability. The creep behavior of weak rock mass is an essential factor, which causes the evolution of stresses and displacements in the backfill stope. In this paper, numerical models were constructed to analyze the interactions between rock mass and backfill by considering the creep behavior of the rock mass, filling interval, and backfill strength. The numerical simulation results showed the effects of different parameters, including the number of backfilling layers, filling interval time (FIT), and backfill strength under creep behavior on stress, displacements, and plastic deformation. The horizontal displacement near the mid-height and vertical displacement at the top of the backfilled stope is the largest compared to layered backfilling. The stress within the backfilled stope is smallest when the stope is filled in a single layer. With increasing FIT, stress in the backfilled stope decreases. FIT mainly affected the horizontal displacement of the stope. The stresses on the stope bottom decrease when the strength of the middle-backfilled stope decreases. Overall, this study provides important insights for understanding the creep behavior of rock mass in underground backfilling practices.
Highlights
Cemented paste backfill (CPB) is a method that transports the mixture of tailings and cement to the goaf, which can deal with pollution and land occupation by tailings, and may improve ground stability and increase ore recovery [1,2]
Understanding the deformation of backfill and rock mass is key to evaluating their interaction—this interaction can be obtained through field measurements, experimental tests, numerical simulations, and other methods, and significant progress has been made in this regard [16,17]
The rock mass in Case 1 was modeled with MC, whereas the rock mass of Case 2 was modeled with creep viscoplastic model (CVISC)
Summary
Cemented paste backfill (CPB) is a method that transports the mixture of tailings and cement to the goaf, which can deal with pollution and land occupation by tailings, and may improve ground stability and increase ore recovery [1,2]. This approach has societal, economic, and environmental benefits; CPB has been adopted in many mines worldwide [3,4,5,6]. The evolution of displacements between backfill and rock affects the stress magnitude and distribution; analyzing these displacements and stresses forms the basis of analyzing the interaction between backfill and rock
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