The high-stress soft-rock roadway controlling technology in the deep mine has been the hot research focus.
The presence and condition of roadways control the utilization of natural resources, which are associated with direct and indirect impacts on soil erosion in undeveloped countries.
Owning to differences of the geological structure, mining depth, and surrounding rock properties, a variety of roadway-controlling technologies have been proposed.
Witnesses said she struggled to steer back onto the roadway, lost control and careered head-on into a minivan, killing herself and six members of an extended family in the minivan.
Field monitoring results show that bolt-cable coupling support has achieved the aims of roadway stability control and minimizes deformation.
Many countries, such as Germany, UK, France, Poland, Russia, the United States and Australia, carried out researches on the theories and techniques of roadway strata control according to the local geological conditions.
They have said: this is a view of the future when the communications roadways are controlled by a few large companies.
When roadways are driven in broken rocks, rock bolting is not effective to control roadway deformations because of poor anchoring performance and low bearing capacity of bolts.
Roof stress was relieved by pre-splitting explosion with roof long boreholes and the "three high and one strong" support technique was used to control roadway stability.
