Jian Zhao

TL;DR: In this paper, the authors considered the problem of transient wave propagation in a rock mass with a set of parallel joints by using a recursive method, where the joints are assumed linearly elastic.

TL;DR: In this article, a continuous-discontinuous element method (CDEM) is applied to simulate micro-cracks under excavation-induced unloading conditions and a micro-seismic (MS) monitoring system is employed to monitor real-time MS events during construction of underground storage caverns.

TL;DR: In this paper, a discrete element model is proposed to examine rock strength and failure, where the material is represented as a collection of irregular-sized deformable particles interacting at their cohesive boundaries.

TL;DR: In this article, three sets of TBM penetration tests are conducted with different in situ stress conditions in three TBM tunnels of the Jinping II Hydropower Station, and the correlation between TBM operation parameters collected during the tests and the rock mass boreability index is analyzed to reveal the influence of in situ stresses on rock mass Boreability and TBM excavation process.

TL;DR: In this article, the individual influence of three parameters relating to the geometry of partially-spanning joints: joint location, joint orientation, and joint trace length was studied, and the numerical results showed that there is an approximately linear relationship between the location of the terminus of a partially-cut joint with respect to the end of the sample (joint location) and the compressive strength of the partially cut sample, whereby failure stress increases with increasing joint location value.