Because the larger mining depths cause higher ground stresses, maintaining long gob side roadways is extremely difficult and the roadways suffer significant deformation.
The police experience great difficult in clearing the roadway, and both mounted and foot police used their truncheons.
Shortly after this, the most difficult stretch of the roadway that the Brigade had ever undertaken the 27-kilometer stretch of National Highway QL-11 South in the central highlands region known as Tây Nguyên, commonly referred to as the "Good View Pass", was completed.
Snow is falling in the highlands, making transport difficult even where the roadways are relatively safe.
It is very difficult to support these roadways using traditional methods, and more advanced support techniques are needed.
Soft rock prevalent in coal-bearing strata in China, a lot of soft rock is buried deep in the larger role of high stress by the formation, and maintenance of the roadway is very difficult to dig.
To acquire the data required to develop and test the algorithms presented in this paper, several drivers have been recruited and were exposed to a wide variety of difficult situations commonly encountered on roadways, for both daytime and nocturnal conditions.
Motorcycles are more difficult to see on the roadways than passenger vehicles or large trucks.
Collapsed bridges and damaged roadways have made it difficult to even get to some areas.
Because larger mining depths cause higher ground stresses, it becomes extremely difficult to maintain long gob side roadways.
