Double-O-tube shield tunneling technology has gained extensive attention due to saving space and the high cost-effectiveness of underground construction method. Estimating predicting DOT tunneling-induced soil displacements is essential prevent damage nearby aboveground structures in densely populated urban areas. This study develops a device for modeling based on transparent image processing t...

Abstract It is difficult to accurately calculate the lump coal rate in a fully mechanized mining face. Therefore, numerical simulation of wall cutting process, which revealed crack expansion, development, evolution body and corresponding formation mechanism, was performed PFC2D. Moreover, correlation established between force formation, statistical analysis method proposed determine rate. The f...

In this paper, the problem of a retaining wall under active translation mode is investigated numerically. To this end, a series of numerical models is conducted using the discrete element code, PFC2D. The backfill soil is simulated by an assembly of separate cohesionless circular particles. Backfill soil was prepared by pouring soil particles from a specific height under gravity force and givin...

Ultrasonic vibration-assisted rock breaking is a potentially effective technique to accelerate hard drilling processes. Fatigue damage primary factor that governs fragmentation subject ultrasonic vibration, and when such accumulates critical level via crack initiation propagation, macro-damage (e.g., macro-cracks) will occur. To date, however, the specific fatigue mechanism of materials under h...

Earthquakes are generally known to alter the stress field near seismogenic faults. Observations using YRY-four-gauge borehole strainmeters within Yushu (YSH) Ganzi-Yushu fault in eastern Tibetan Plateau shows that azimuth variation of maximum horizontal (SH) first decreased and then increased substantially when earthquakes occurred during measurement period from January 1, 2009 December 31, 201...

The pre-peak microstructure evolution of the material is crucial in determining strength and failure scheme material, but not captured by existing shear parameters models which focus on post-peak stage information. Novel concepts pseudo-cohesion pseudo-internal friction angle that account for both information were proposed this study, based experimentally observed response rock mechanics to an ...