The limestone stratum has well-developed rock fissures and abundant groundwater. Under extreme rainstorm conditions, tunnel surrounding seepage is serious especially. In order to reveal the grouting diffusion mechanism of karst fractured mass realize effective water plugging, in this paper, basic mechanical parameters are obtained by laboratory triaxial test, porosity distribution nuclear magne...

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...