Mechanical Behavior of Gas-Transmission Pipeline in a Goaf

To solve the safety hazard of a buried gas pipeline caused by subsidence mined-out area, three-dimensional model in area was established using geological parameters and finite-element software ABAQUS. The effects friction coefficient pipe soil, coal-seam dip angle, horizontal angle on mechanical behavior under varying widths goaf were investigated. results indicate that maximum equivalent stress is negatively correlated with angle. Concerning longitudinal mining, exhibits high-stress zone when mining length >200 m, surface displacement appears small range 40 stratum increases gradually increase length. When width constant, positively tube-soil coal seam position tends to appear near uphill side seam, an