Finally, an example of a deep rock cavern excavation is presented to illustrate the feasibility of the proposed approach for practical applications where complex numerical procedures are needed to compute the performance function. Reliability analyses involving four-parameter beta distributions are also investigated. History values are retrieved in the order they are declared. The fish history command: fish history name‘fred’ fred The symbol may not be a function, if so the current value is retrieved. This option includes the Finn constitutive model for dynamic pore pressure-generation. The results show that the support installation position and the parametric correlations have great influence on the probability of the three failure modes. FISH functions can be executed and their (real) return values stored as histories. The dynamic analysis option permits two-dimensional, plane-strain, plane-stress or axisymmetric, fully dynamic analysis with FLAC. The efficiency and the accuracy of the proposed approach are first illustrated with the case of a circular tunnel involving analytical solutions with respect to three performance functions. The probability of failure is estimated from the first-order and second-order reliability method (FORM/SORM) based on the generated ANN response surface and compared with Monte Carlo simulations and polynomial response surface method. FLAC3D Fixed an issue in the 2D extruder selecting a block completely contained inside another block. FLAC3D Fixed an issue in the 2D extruder involving sorting edges when creating closed polygons. The uniform design table is used to prepare the sampling points for training the ANN and for determining the parameters of the network via an iterative procedure. FISH Functions that use deferred actions under multi-threading (generally creation or deletion) now return lists in the same order they were split in. This model has been validated first with simple element tests at different confining pressures for different rocks with different joint configurations. R 0.1 indicates 10 of the stresses applied on the roadway surface are released). A new FISH function has been written in FLAC3D specifically for modeling jointed rocks using the Duncan and Chang hyperbolic model. The stresses applied on the roadway surface were released in a total of 10 stages, with a release factor R changing from 0 to 1 in increments of 0.1 (i.e. The ANN model is employed as the response surface to fit the real limit state surface. The FISH function ZONK.FIS was used to simulate stress release. The deterministic model is based on the convergence–confinement method.
An efficient approach is proposed in this paper for probabilistic ground-support interaction analysis of deep rock excavation using the artificial neural network (ANN) and uniform design.