Strength deteriorating of unloading rock mass in highly stressed roadway
Taking excavation of a high stress roadway as an object and based on unloading rock mechanics theory and Hooker theorem, an equivalent 3D model of-850 m level main cross drift in a mine was built, the unloading zones of drift excavation was ascertained, and the functional expression between rock mechanical parameters in different unloading part and unloading quantity was established, thus parameter deteriorating law of unloading rock mass was acquired.The results show that tunnel face and surrounding rock could be divided into three unloading parts as I, II, III along drift excavation, which was corresponding to broken zone, plastic zone and elastic zone.In the process of unloading, the internal friction angle, cohesion and elastic modulus in different unloading parts declined gradually, whereas Poissons ratio increased.The function between rock mechanical parameters and unloading amount provides a theoretical basis for analysis of unloading response of drift excavation.
H.J.Lu F.Gao D.Q.Gan T.Luo
College of Mine Engineering, Hebei United University, Tangshan, Hebei, China;Hebei Province Key Labo College of Mine, Liaoning Technical University, Fuxin, Liaoning, China
国际会议
The 3rd ISRM Young Scholars Symposium on Rock Mechanics(第三届国际岩石力学青年学者论坛)
北京
英文
241-247
2014-11-08（万方平台首次上网日期，不代表论文的发表时间）