Failure characteristics and its influencing factors of talus-derived rock mass during open-pit mining
(1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China;
2. Shanghai Jianke Engineering Consulting Co., Ltd., Shanghai 200032, China;
3. Sch)
2. Shanghai Jianke Engineering Consulting Co., Ltd., Shanghai 200032, China;
3. Sch)
Abstract: The failure characteristic of talus-derived rock mass continues to challenge quantitative hazard assessments in open-pit mining. Physical model test was used to assess the failure modes and mechanisms on talus-derived rock mass. The different types of failure modes of the talus-derived rock mass were introduced and a possible failure mechanism relation between the failure zone and the structure of the talus-derived rock mass was also shown. The physical model test results indicate that the rainfall has significant influence on the stability and failure modes of talus-derived rock mass during open-pit mining. The development of the seepage area caused by rainfall initiates the localized failure in that particular area, and the initiation of localized instability is mainly induced by stress changes concentrated in the seepage area.
Key words: talus-derived rock mass; model test; failure mode; rainfall; open-pit mining