| The mechanism of deformation of soft rock roadway has been analysed in detail in this thesis, including the elastic restitution, rheology, bulking, water-swelling, etc.,. Also the factors affect the evolution law of surrounding rock stress field have been carefully analysed. The concrete-filled steel tubular stent supporting technology was proposed based on the requirement of strong retaining reaction to maintain the stability of roadway. Initially, after considering the extant theory calculation of bearing capacity of concrete-filled steel tubular short columns, the calculation equation of ultimate bearing capacity of it is deduced according to the elastic deformation theory. A series of lab experiments were conducted to measure load deformation curve, limit load, limit deformation and failure mode of destabilization. The results demonstrated that support capacity of concrete-filled steel tubular stent is two times as much as the U-form steel stent with equivalent length and weight. Thus, a support plan about is is designed based on the analysis of soft rock roadway characteristics in Longkou sea area. |
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