coal crushing and screening plant installation

coal crushing and screening plant installation

A . A b u t m e n t - I n m i n i n g , ( 1 ) t h e w e i g h t o f t h e r o c k s a b o v e a n a r r o w r o a d w a y i s t r a n s f e r r e d t o t h e s o l i d a l o n g t h e s i d e s , w h i c h a c t a s a b u t m e n t s o f t h e a r c h o f s t r a t a s p a n n i n g t h e r o a d w a y ; a n d ( 2 ) t h e w e i g h t o f t h e r o c k s o v e r a l o n g w a l l f a c e i s t r a n s f e r r e d t o t h e f r o n t a b u t m e n t , t h a t i s , t h e s o l i d a h e a d o f t h e f a c e a n d t h e b a c k a b u t m e n t , t h a t i s , t h e s e t t l e d p a c k s b e h i n d t h e f a c e .

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