Dimensionless coefficient () in convergence confinement method shows the relaxation of stress in the wall of the tunnel at different excavation movements. This factor is considered a constant number in previous studies and tunnel geometric characteristics (such as depth, cross-section shape, radius, soil material, etc.) are not included in its determination; however, ignoring these effects can...

Design earthquake ground motions for dynamic analyses are typically specified as outcrop motions, which may have to be modified for input at the base of a FLAC model. Often a ‘deconvolution’ analysis using a 1-D wave propagation code, such as the program SHAKE, is performed to obtain the appropriate input motion at depth. This seemingly simple analysis is often the subject of considerable confu...

Real-world applications routinely make authorization decisions based on dynamic computation. Rea-soning about dynamically computed authority is challenging. Integrity of the system might be compro-mised if attackers can improperly influence the authorizing computation. Confidentiality can also becompromised by authorization, since authorization decisions are often based on sensitive...

The models that were analyzed using FLAC version 4.0 (FLAC, 2000) are shown on Figure 5.1. The models have different soil types: loose silty sand with 20% fines content (Figures 5.1a and 5.1b), soft clay (Figure 5.1c), and silt (Figure 5.1d). Hence, the determination of the parameters is different for each model. The following sections discuss the determination of the parameters used in the ana...

The main goal of this research is to identify the system parameters of the dynamics of Rotor/Active Magnetic Bearing (Rotor/AMB) system employed in turbo molecular pumps (TMPs). The identification approach adopted in this work is based on experimental analysis and the application of Fuzzy Logic Adaptive ControlExtended Kalman Filter (FLAC-EKF). The estimation error for either system state or sy...

Through the theoretical analysis of overburden destabilization mechanism, FLAC 3D simplified plane numerical simulation method and field measurement method, we compared relationship support pressure at 35 m workface recovery, peak decreased from 13.85 Mpa to 11.97 1:1 1:3. With increase mining ratio, over-supporting decreases: with top coal recovery thickness, influence range will be further ex...

The study show the influence of coal mining on pillar under a repeated mining, in close seam group, fracture and instability process mechanism development oxidation pillars. In this paper, FLAC 3D numerical simulation software is used to simulate dynamic evolution characteristics stress, displacement upper pillar. results that 1) theoretical length along strike obtained by establishing mechanic...

We present a method for detecting anomalies in vibration signals of wind turbine components. The predominant characteristics of wind turbine vibration signals are extracted by applying a time-frequency feature extraction method based on Fourier local autocorrelation (FLAC) features. For anomaly detection, one-class classification based on an unsupervised clustering approach is applied in consid...