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The failure mechanism of the roof and walls of a roadway located in the lower coal seam is described.
The overlap was eliminated when NY 5 was moved onto a new roadway located along the edge of Seneca Lake.
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The results have significance for the design of supports for roadways located in similar conditions.
Currently three shafts were fully completed and two main air-return roadways located in the east and west sides of air-return shaft are being tunnelled.
In Fig. 57a, because the roadway's roof and floor are rock, and the two walls are coal, the stress concentration zones after roadway development are located at the four corners of the roadway in the roof and floor rock strata, the maximum compressed stress reaches 22 MPa.
On this basis, we have confirmed that when the width of a longwall mining face roadway protection coal pillar is between 11.6 m and 13.16 m in No. 4 coal seam of Xinrui coal mine in Lvliang in Shanxi province the elastic core region in the coal pillar can be assured and the roadway will be located in the area of lower stress which is outside the peak stress.
This roadway, which is located less than 1 mi north of the city limits of Medina, was given the designation of SR 253.
This can be done with relatively little error in measurement, using geographic information systems and accurately located roadways.
The results show that macroscopic transverse fractures of the inner coal pillar are developed within 2 4 m of the roadway surface, which is located outside the coal pillar anchorage zone.
At a junction 11.3 mile northeast of Glens Falls and 1 mi north of Brayton, NY 9L meets Pilot Knob Road (County Route 38 or CR 38), a local roadway serving several communities located on the shores of Lake George and along the base of Pilot Knob.
In Grand Rapids exposures were conducted within 60 m of a major roadway, whereas the Detroit was located in an industrial area more than 400 m from roadways.
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