ABSTRACT
Linglong gold mine is one of the deepest metal mines in China, and the depth of developing vertical shaft is reaching to 1 000 m. The ground pressure problems become annoying troubles for the company. Recently, a violent rockburst have occurred in −50 m level transport roadway where the buried depth is about 500 m. The surrounding rock failed in typical spalling, as shown in Figure 1. This paper focuses on the occurrence mechanism of the rockburst which was happened in such a shallow roadway. The rockburst tendency
1 INTRODUCTION
With the increase of excavation depth in hard rock, rock mass failures induced by high geostress are more and more frequently observed. As one of the most severe disasters in deep engineering, rockburst brings a huge loss for workers and companies. From 1738 when the first rockburst phenomenon was observed till now, rockburst has been always a hot but complicated issue for researchers (Vardoulakis 1984, Ortlepp & Stacey 1994). Lots of understandings on rockburst have come to an agreement, while many are still in disagreement (He et al. 2012). It is generally assumed that the occurrence of rockburst is related to many factors, such as geo-stress, rock properties and buried depth of rock mass. Many literatures have been published concerning on the rock failure type induced by a rockburst (Ortlepp & Stacey 1994, Wang et al. 2012). However, the present achievements are still not enough to fully understand the induced mechanism of rockburst, including where and when the rockburst may happen.
