Research on Combined Support Technology of Full-length Anchor Cable in Roof of Inverted Trapezoidal Coal Roadway
Aiming at the problem of poor stability of surrounding rock and failure of support body caused by high ground stress in the inverted trapezoidal coal roadway of 1902S return air roadway in Great Wall No.5 Coal Mine,after investigating the construction site on the spot,combined with FLAC3D numerical simulation,the support failure system of the original scheme is analyzed,and the combined support technology of"full-length anchor cable+combined support steel pier column+W steel strip+steel bar anchor net+steel strip"is proposed.The law of mine pressure appearance is analyzed from two as-pects:the deformation of roof surrounding rock and the relative displacement of the side.The conclusions are as follows:The stress distribution of the combined support body of the bolt and anchor cable in the original scheme is biased,which cannot solve the stress concentration phenomenon at the corner of the inclined roof.The full-length anchor cable support corresponds to the roof separation and stress concentration position,and the supporting steel pier column is used to reinforce the support at the corner of the roof.The mine pressure monitoring data show that the technology significantly improves the stability of the sur-rounding rock of the roof and effectively reduces the pressure and deformation of the side.The tensile effect of the anchor cable is obviously stronger than that of the bolt,which provides an important practical significance for solving the roof support of the irregular roadway.
inverted trapezoidhigh ground stressfull length anchorage cablenumerical simulationthe law of mine pressure appearance
NETL
NSTL
万方数据
