Coal Mine Surveying
Coal Mine Surveying
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In our eReader you can find the full English version of the book. Read Coal Mine Surveying Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Coal Mine Surveying
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To quickly assess the difficulty of the text, read a short excerpt:
In Fig. Ill, by means of the undercut A B a. Wedge-shaped block of coal A B C D is undermined, if sprags or wedges be placed under the mouth of the undercut, the triangular block A D E is still unsupported, giving us at once the reason for the liability to falls of face in such a working, and also demonstrating the need for the cocker sprag (shown) or equivalent means of supporting the face. The action of the roof is two fold. There is a pressure P, acting normally to the plane 70 MINING WITHOU...T TIMBER of the seam; there is a thrust T, acting in the direction of dip, tending to make the roof slide over the face toward the empty space behind it.
The force T is evidenced in the fact that a fracture in the roof of a rise working " gapes, " owing to the lower side having moved slightly down under the influence of T. Thus it is that falls of roof are more prevalent in rise workings than in any other; the side thrust T, not only quickly breaking up the roof, but also widening the joints the better to allow severed slabs to fall.
What to read after Coal Mine Surveying?
You can find similar books in the "Read Also" column, or choose other free books by Adam Thomas Shurick to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In Fig. Ill, by means of the undercut A B a. Wedge-shaped block of coal A B C D is undermined, if sprags or wedges be placed under the mouth of the undercut, the triangular block A D E is still unsupported, giving us at once the reason for the liability to falls of face in such a working, and also demonstrating the need for the cocker sprag (shown) or equivalent means of supporting the face. The action of the roof is two fold. There is a pressure P, acting normally to the plane 70 MINING WITHOU...T TIMBER of the seam; there is a thrust T, acting in the direction of dip, tending to make the roof slide over the face toward the empty space behind it.
The force T is evidenced in the fact that a fracture in the roof of a rise working " gapes, " owing to the lower side having moved slightly down under the influence of T. Thus it is that falls of roof are more prevalent in rise workings than in any other; the side thrust T, not only quickly breaking up the roof, but also widening the joints the better to allow severed slabs to fall.
What to read after Coal Mine Surveying?
You can find similar books in the "Read Also" column, or choose other free books by Adam Thomas Shurick to read onlineMoreLess
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