Support technology for large section roadway in deep high geostress soft rock
In order to solve the problems of poor formation quality and difficult support of the deep high geostress soft rock roadway in the 2902 lower trough rock roadway section,which is limited by construction conditions and technical level,the strength,surrounding rock properties,and geostress parameters of the roadway surrounding rock were tested and analyzed through testing the geological and mechanical parameters of the roadway surrounding rock.Based on the test analysis re-sults,the control principle for deep high geostress soft rock roadway is proposed,and the support method is determined to be the"anchor mesh cable+36U shaped shed+anchor cable beam+respraying+grouting"composite support technology.Combined with the key support parameters of the roadway,a comprehensive study has been conducted.From on-site observa-tions,it can be seen that after adopting the composite support technology,the maximum subsidence of the roadway roof is 24 mm.After 17 days of excavation,the stability of the tunnel roof is improved,the support effect is improved,and the integ-rity of the roof is good.The control technology can effectively control the deformation of surrounding rock in deep high geostress soft rock roadway.
deep soft rockhigh geostresssoft rock roadwayroadway support
国家科技期刊平台
NSTL
万方数据
