Project(51508575)supported by the National Natural Science Foundation of China;Project(2011CB013802)supported by the National Basic Research Program of China;Projects(2014M560652,2016T90764)supported by the China Postdoctoral Science Foundation;Project(2015RS4006)supported by the Innovative Talents of Science and Technology Plan of Hunan Province,China
Based on the similarity theory,a tunnel excavation simulation testing system under typical unsymmetrical loading conditions was established.Using this system,the failure mechanism of surrounding rock of shallow-bias t...