Effects of Dilation Angle on Dog-Ear Rockburst Notches of a Circular Tunnel

摘要：

Rockburst processes of a circular tunnel are modeled at different dilation angles by use of FLAC. After the unexcavated model in plane strain reaches a static equilibrium state, a circular tunnel is excavated using a written FISH function. A composite Mohr-Coulomb criterion with tension cut-off is adopted as the failure criterion. Beyond the occurrence of failure, rock is assigned to obey linear strain-softening behavior and then ideal plastic behavior. At lower dilation angles, the area of the V-shaped notches is smaller, the shear bands constituting the notches are straighter, and the distance between two notches is farther. At higher dilation angles, the V-shaped notches are deeper, the outline of the notches is more curved, and the distance between two notches approaches zero. The present numerical results are in agreement with the previously experimental and field observation results.

作者: Xue-bin Wang Yi-shan Pan

作者单位: Liaoning Technical University, Fuxin, China

会议类型: 国际会议

会议名称: 3rd International Geotechnical Symposium on Geotechnical Engineering for Disaster Prevention and Reduction(第三届国际岩土工程防灾减灾学术研讨会)

会议地点: 哈尔滨

会议语种:英文

页码: 516-523

在线出版日期: 2009-07-22（万方平台首次上网日期，不代表论文的发表时间）