EBZ280A Hard Rock Roadheader Case Study at Datong Coal Mine
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The Datong Coal Mine project demonstrates the application of the Weishi EBZ280A hard rock roadheader in a large full-rock roadway excavated through coarse sandstone.
The project involved a 6.0 m-wide and 4.9 m-high roadway with a 6° gradient. The surrounding rock was classified as F9 coarse sandstone, corresponding to an approximate uniaxial compressive strength of 90–100 MPa.
Under these demanding geological conditions, the EBZ280A achieved a maximum monthly advance rate of 113 m, demonstrating its suitability for mechanized roadway development in medium- to high-strength rock formations.
Project Overview
Equipment Model: EBZ280A
Excavation Section: 6.0m (width) × 4.9m (height)
Rock Lithology: Coarse sandstone
Rock Hardness: F9 (approximately 90–100 MPa UCS)
Gradient: 6° (inclined)
Tunnel Condition: Full rock (no coal seam)
Maximum Monthly Advance Rate: 113 meters
Project Background
The mine required a mechanized excavation solution for a large-section roadway located entirely within coarse sandstone.
Unlike coal-rock or mixed-face roadways, a full-rock roadway places continuous cutting loads on the roadheader. The machine must maintain sufficient cutterhead torque, chassis stability and material-removal capacity throughout the excavation cycle.
The roadway dimensions also created a demanding positioning requirement. With a width of 6.0 m and a height of 4.9 m, the excavated profile covered approximately 29.4 m². The roadheader therefore needed sufficient cutting reach to complete the designed cross-section while limiting repeated machine repositioning and excessive profile correction.
In addition, the 6° roadway gradient required reliable crawler traction, stable machine positioning and effective movement of broken rock away from the cutting face.
Main Excavation Challenges
The principal challenge was the F9 coarse sandstone, with an estimated compressive strength of approximately 90–100 MPa.
Coarse sandstone can create demanding roadheader conditions because its mineral composition and grain structure may increase cutter pick wear, cutting vibration and impact loading.
In this type of formation, equipment selection cannot depend on cutting motor power alone. The overall result is influenced by:
The roadheader therefore needed a cutting system capable of maintaining stable engagement with the rock while controlling vibration and wear.
The 6.0 × 4.9 m roadway required the roadheader to cover a relatively large cutting envelope.
A machine with insufficient positioning height or width would require frequent repositioning and additional trimming. This can reduce effective cutting time and make it more difficult to maintain a consistent roadway profile.
The selected machine needed to provide:
Because the roadway contained no coal seam, the cutting head operated continuously in rock rather than alternating between softer coal and harder rock bands.
This increased the importance of:
The 6° gradient was not exceptionally steep, but it still affected crawler traction, machine positioning and muck transfer.
The roadheader had to remain stable while cutting and avoid excessive movement caused by the reaction forces generated at the cutterhead.
The downstream conveying arrangement also needed to remove broken sandstone effectively on the inclined roadway.
The EBZ280A was selected as a balanced hard rock roadheader for medium- and large-section underground roadways.
Its equipment configuration matched the main requirements of the Datong project:
Compared with smaller roadheaders, the EBZ280A offered greater cutting power and structural stability for full-rock excavation. Compared with significantly larger machines, it provided a practical balance between underground transport, maneuverability, acquisition cost and cutting performance.
EBZ280A Configuration for the Project
The roadheader used a boom-mounted cutting system to excavate the roadway profile progressively.
The cantilever design allowed the operator to move the cutting head vertically and laterally across the face. This made it possible to excavate the roof, sidewalls, center section and floor according to a controlled cutting sequence.
For hard sandstone, the cutting sequence is important. Excessively deep engagement can increase vibration and cutter loads, while shallow, controlled passes can improve stability and reduce peak impact on the picks and tooth holders.
The crawler chassis provided the reaction force required to keep the cutting head engaged with the rock.
A stable machine platform is especially important in hard-rock excavation because excessive body movement can cause:
The crawler system also allowed the machine to advance and reposition within the 6° inclined roadway.
Broken sandstone was collected by the front loading system and transferred through the onboard conveyor to the mine’s downstream haulage equipment.
Continuous muck removal was necessary to prevent broken rock from accumulating around the cutting face and interfering with the next cutting pass.
The loading and conveying system supported:
Hard-rock cutting generates substantial dust and heat at the cutter picks.
Internal and external spray systems help:
Actual dust-control performance depends on water pressure, nozzle condition, ventilation and mine operating procedures.
Monitoring of motor load, hydraulic temperature and other operating conditions helps operators identify abnormal resistance before it develops into a major fault.
During hard-rock excavation, the operator should pay particular attention to:
These operating indicators support timely adjustment of the cutting depth, boom movement and machine advance.
For a hard-rock roadway project, equipment delivery is only one part of the solution.
Recommended technical support can include:
The exact support scope should be confirmed according to the project location and contract.
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