The current practice of deterministic calculations of the characteristics of locomotive haulage proceeds from a simplified model of a train flow, with average interval used as the only parameter [i]. More exact probabilistic calculation methods are also known, which are based on the queue theory [2], with a train flow as the elementary case. The expectation of the interval between trains is set equal to its standard deviation, i.e., the train flow is still described by a single parameter. However, a real stream of trains can be essentially different and should be described by several parameters.

1. The sufficiently high reliability of the standard (k-e) model for the Reynolds-stress in calculating the velocity field in plane chamber-like mine workings has been demonstrated. 2. A version of the velocity-field calculation in plane chambers by the Smagorinskii model has been proposed, using the (k-e) model in the preliminary stage, so as to permit considerable reduction in computer time. 3. The most rational finite-difference schemes for approximation of the advection term in the turbulent-diffusion equation when estimating the air transfer in plane chamber-like workings have been recommended: a) for periodically acting localized sources of impurity ejection, scheme VII (Table 2); b) for discharge emissions of harmful impurities, scheme VI (Table 2). 4. It is shown that scheme V (Table 2) has high schematic viscosity in a nonuniform velocity field, and therefore cannot be used to calculate flows in chambers with complex geometry. 5. Using the numerical modeling of the physical fields (air velocity and impurity concentration) in a ventilated volume proposed here permits the determination either of the time to achieve the maximum permissible concentration with specified contamination-source intensities and air flow rates or the air flow rate required in a specified ventilation time.

The conditions in production and injection wells are controlled in order to even out the advance of the water front to producing wells. This includes switching producing wells to injection status, stopping the process, moving oil production from watered out to nonwatered out wells, etc. All these efforts sometimes fail to make water flooding feasible because they do not affect the physical characterististics of the formation system.