As of October 2, 2022, the Alioth Group, acting in cooperation with DSI-Sandvik Undergound, introduced in the area of the exploited longwalls of the coal mine of the PGG group, a fiber-optic rock mass stress monitoring system based on the unique FORBS (Fiber Optic Rock Bolts System) sensors developed and patented by the Alioth Group (patent application No. P.442438 utility model application W.131019).
Intrinsically safe FORBS sensors have been installed in the longwall roadway arrow in the area of the exploited hard coal longwall at level 500. A grid of FORBS sensors connected by a fiber-optic cable to an analyzer and data recorder allows continuous monitoring of the behavior of rock masses (24H7) with ongoing visualization of measurement data from each anchor on a computer screen for those responsible for the safe operation of the workings.
Those interested in the continuous measurement of rock masses located directly above the longwall arch casing include the rock bump and casing department, the energomechanical department, the geological department with the mine director at the head.
The fiber-optic measurement system of the behavior of rock masses based on FORBS sensors makes it possible to obtain information on geological phenomena occurring at a distance of up to 2.5m from the anchorage point.