Abstract
Roof bolting is the most popular type of support for underground mines’ workings. However, in Polish coal mines it is used only as a supplementary support. To raise the effectiveness and economic score of horizontal development works, JSW (Jastrzębska Spółka Węglowa) started a project to introduce the independent rock bolting support in its mines. The key element of the project is the monitoring of mine workings supported with roof bolting, as appropriate control allows one to ensure a proper level of safety. The following work presents a monitoring system for mine working supported with roof bolting applied in the project, as well as results of the measurements obtained using this system. The aim of the monitoring was to prove that independent roof bolting provides a proper level of safety and thus is applicable in conditions of Polish underground coal mines, particularly Budryk mine. It was to be proved by the evaluation of data obtained from instrumented bolts, extensometers of different type and convergence measurements. These results allowed us to verify the validity and reliability of the roof bolting in geological and mining conditions of Silesian Coal Basin.
Highlights
The aim of the project is to determine the possibility of use of such a type of support in mine workings to help reduce the costs of development works, maintain a high level of safety, as application of roof bolting is a common way of optimizing development costs in underground mines [15]
Stability of the Bw-1n roadway, the first roadway driven by Bolter Miner machine in Polish coal mining industry, was constantly monitored using five periodic control stations, five convergence control station and numerous everyday control stations Stability monitoring comprises:
The main goal of stability monitoring in the Bw-1n roadway was conducted to prove safety of independent rock bolting support in conditions of Polish coal mining industry
Summary
Roof bolting is the most popular type of support in drifts, crosscuts and other workings in underground mines. Independent rock bolt support is rarely used in Polish coal mines, despite its popularity in metal ore mines or for underground structures, such as tunnels [8,9,10,11,12,13,14]. In 2019, JSW (Jastrzebska Spółka Weglowa) started a project for the introduction of independent rock bolting support in Polish coal mines. The aim of the project is to determine the possibility of use of such a type of support in mine workings to help reduce the costs of development works, maintain a high level of safety, as application of roof bolting is a common way of optimizing development costs in underground mines [15]
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