Abstract
Backfill mining methods are widely used in metal mines. The boundary part of the backfill has a direct effect on the local stability in mining engineering. The distribution of stress on the boundary part of the backfill and surrounding rock had their own features. To study the characteristics of stress distribution of backfill and surrounding rock on the boundary part, we conducted a field investigation, field monitoring, and numerical simulation. According to the underground monitoring, the overall characteristics of the boundary part of the backfill were that the accumulated horizontal stress was larger than the accumulated vertical stress on the deep sublevel and the accumulated horizontal stress was smaller on the shallow sublevel. On the contact zone (i.e., the boundary part), the stress of the surrounding rock was larger than the stress of the backfill. Combined with the numerical model analysis, we determined that the geometric features of the backfill boundary had an influence on the stress distribution of stress. The multistep boundary helped the integrity of the contact zone and local stability in deep mining.
Highlights
Backfill mining method was first introduced to the mining engineering in the 1970s
In the shallow part of the backfill boundary, the accumulated vertical stress was larger than the accumulated horizontal stress
E degree of complexity had an effect on the stress transference and on the interaction between the surrounding rock and the backfill on the contact zone, which influenced the local stability of the backfill boundary
Summary
Backfill mining method was first introduced to the mining engineering in the 1970s. Since the cemented paste backfill has been increasingly and widely used in many underground mines [1,2,3,4]. e backfill has played a significant role in bearing mining pressure, controlling rock deformation, and increasing stope stability. e backfill provides a stable working platform for miners and reduces open space that potentially could be filled with surrounding rock in the event of a collapse. The cemented paste backfill has been increasingly and widely used in many underground mines [1,2,3,4]. E backfill has played a significant role in bearing mining pressure, controlling rock deformation, and increasing stope stability. E mechanical failure of backfill structures jeopardizes mining production and greatly threatens the safety of workers underground and has substantial financial ramifications for the mine [14,15,16]. E tectonic structures (e.g., faults, joints, and contact fracture zones) produce fragmentation within the host rock, causing poor mechanical stability. We extended the field investigation and measurement to a sublevel of 1050 m
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