Software: PFC: Pre-Release 4.0
64-bit version
Computers based on a 32-bit architecture can process 232 memory address locations of any information in virtual memory (RAM). Any memory not used by the computer's operating system is free for use by software applications like PFC3D and represents the maximum possible model size (approximately 2 to 3 GB, depending on the available hardware).
While this is sufficient for most PFC3D models, in cases where many hundreds of thousands of particles are required, model size begins to quickly outpace available memory. For example, in the figure below an SRM (synthetic rock mass) model 80m on each side required over 800,000 particles for the required particle resolution. This model was too large to be modeled on a conventional desktop computer and required the newer 64-bit architecture. A 64-bit computer can process 264 addresses (16 billion GB) and is limited, for all practical purposes, only by the available hardware.
An 80m cubic specimen exceeding 800,000 particles required a 64-bit computer. The Statue of Liberty is shown for scale.
As shown in the next figure, cubic SRM models are generated in three steps: (a) building a pbrick which can be fitted together to form (b) an intact periodic assembly of particles, which is then (c) broken up into clusters of intact particles by a series of smooth-joints as defined by a discrete fracture network (DFN). Such a fracture network can be seen in the following figure, where the particles have been made semi-transparent.
An SRM model is generated in three main stages using the pbrick logic and the new smooth joint contact model.
A typical Discrete Fracture Network (DFN) used to generate an SRM specimen in PFC3D (particles shown as semi-transparent).
The SRM specimen will be tested using conventional methods (direct-tension, uniaxial compression, and triaxial compression) in order to characterize the rock mass to be mined.
