Deformation law of surrounding rock in soft rock roadway

1 The surrounding rock deformation of soft rock roadway has obvious time effect. It shows that the initial deformation speed is very large, and the deformation tends to be stable, and the rheology is still generated at a large speed, and the duration is long. If effective support measures are not taken, the deformation of the surrounding rock will increase sharply, which will inevitably lead to instability and damage of the roadway.

2 Soft rock roadway is mostly characterized by circumferential compression and asymmetry. In the soft rock roadway, not only the deformation of the roof is easy to fall, but also the bottom plate also produces a strong bottom sill, which causes the two ruins to collapse the roof.

3 The deformation of surrounding rock in soft rock roadway increases with the increase of buried depth, and there is a critical depth of softening. The deformation exceeding critical depth increases sharply.

4 The surrounding rock deformation of soft rock roadway has obvious directionality under different stresses. The roadway has poor self-stability and short self-stabilization time.

Heavy Steel Fabrication

Coeffort has been supplying steel equipment, structure manufacturing and Installation service from the year of 2013. We focus on producing the highest quality mechanical steel structures and conveyor equipment with advanced steel fabrication processes and machinery. Our commitment to quality metal products, superior customer service and ability to manufacture and assemble has earned us the trust and recognition from our clients in Australia and Asian countries.


Coeffort's Fabrication Service includes but is not limited to:

  • Structure Engineering Design and Shop detailing services
  • Industrial Conveyors, belt conveyor, Chain Conveyor, Bucket Elevator, Screw Conveyors etc.
  • Solid / Liquid Separation Machine, Thickener and Vacuum Belt Filters
  • Heavy industry workshop building structures
  • Industrial process plant buildings, trusses, trestles.
  • Mining equipment, plate works (chutes, hoppers, bins, tanks etc.)
  • Non-pressure vessel/tanks.
  • Pipe spools fabrication.
  • Steel Structures & Equipment Installation



Our facility and production capabilities include:

  • 15,000 m2 purposed- built Factory.
  • Approximately 50 staff capable of factory work
  • Overheads Cranes with Maximum capacity of 32 Tons, height under the hook of 8m
  • CNC Cutting Machine, Shearing Machine ,Bending & Rolling Machine etc.
  • Shot and Sand Blasting Machine with painting facilities


Quality Control System

We are ISO9001 qualified workshop.

DOC Control as per in-house procedures.

MDR Doc – ITP, Raw Material Traceability, Welding Procedure, Welder Qualification, NDT, Dimension and Trail Assembly Report, Painting Inspection, are our standard QA docs.

Welding Quality Control

Welding Standard: AWS D1.1, AWS D1.6, or other International Standard

Welder Qualification: certified as per AWS

AWS Certified Welding Inspector (CWI)

Painting Quality Control

We have contracted Painting inspector with NACE II qualification to guarantee painting surface preparation and painting quality.


Our aim is to be a leading customized steel equipment manufacturing supplier in China through our strict QA systems.



Our Facility

Facility 1


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