The combination of rock bolting and steel supports is commonly used in complex roadways.
The bolting system with high pretension and extra high strength can reinforce complex roadways once for all.
The recent developments of roadway support technologies were introduced abroad, based on the experiences of supports for deep and complex roadways from Germany, the United States and Australia.
Two combined supports, rock bolting and grouting, rock bolting and steel supports commonly used in complex roadways, are detailed as follows.
In more complex roadways the advanced warning could also lead to a change of route, so drivers can avoid the section of road where the obstacle exists.
These characteristics bring about a series of complex roadways, such as ones surrounded by soft rocks, ones surrounded by broken rocks, ones suffering high stresses, ones driven along gob area and retained along gob-side.
In response to growing public health concerns regarding elevated air pollutant exposures and adverse human health effects for near-road populations, a study was conducted to assess how complex urban roadway configurations affect local-scale air quality.
This method allowed us to capture complex patterns in roadway emissions (e.g., the influence of multiple roadways, intersections, off-ramps).
The Discrete Phase Modeling in Fluent was employed to solve the problem and unstructured grids were utilized to mesh the complex 3-D roadway with different airduct allocations.
As the most widely used support structure, rock bolt system has been successfully used to support coal mine roadways in various complex geological and geotechnical conditions, including roadway in extremely weak rock masses, roadways 1000 m below ground, open-off cut roadways with large section, and roadways along the edges of mined-out areas with thin pillars or even no pillars.
