Longwall Mining Roof Supports

The longwall panel the block of coal that is being mined is typically 3 4 km 1 9 2 5 mi long and 250 400 m 820 1 310 ft wide.

Longwall mining roof supports.

Joy powered roof supports for high capacity longwall applications are custom designed to meet your exacting cycle and operating requirements. Our longwall top coal caving ltcc roof supports allow mining of seams up to 10 m 32 8 ft. Permanent supports are only needed in the first workings portion and during installation and recovery operations. Ratings up to 1 750 tonnes widths of 1 5 1 75 and 2 05 meters.

A mining method in which very long rectangular blocks of coal are defined during the development stage of the mine and then extracted in a single continuous operation by an automated cutting head moving parallel to the coal face when the coal is cut the working area is protected by a movable powered roof support system. With longwall mining is a complex system understanding a few basic concepts will help to clarify the support design requirements. As the face progresses the immediate roof above. In any underground mining activity the in situ vertical and horizontal stresses that exist in the.

While it is frequently argued correctly that all items on a longwall face have to be considered as parts of an integrated unit and be fully compatible it cannot be denied that poorly designed and inadequate roof supports are likely to have a greater effect on results than other items and. Longwall mining equipment selection b face supports. Roof support technology for longwall tailgates has changed dramatically during the past decade. Roof supports for special applications.

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice typically 0 6 1 0 m 2 ft 0 in 3 ft 3 in thick. Other roof supports longwall chocks or shields on modern longwalls are moved and relocated with the face equipment.