Abstract
Rock mass conditions observed in excavated surfaces are generally believed as the result of changes due to weathering during a period of geologic time span, that has resulted in gradation distribution within the rock mass. The gradation distribution however tends to be dependent on the joint planes that are present in the rock mass.
Computer simulation of weathering process in jointed rock masses has been attempted in order to understand the change in rock mass condition and distribution. If the relation of changes is formulated mathematically, and joint distribution as boundary conditions are obtamed, it may be possible to simulate the change of grade using computer.
The probable and basic relation presented here is that the decreased rate in grade at any point is in proportion to its spatial gradient at the given point. Computer simulations have been carried out on the basis of a simple differential equation expressing the relation under any boundary conditions. Several examples of simulated results were observed to appropriately represent the change in gradation distribution of jointed rock masses.
These simulation studies are consequently useful to estimate or predict the rock mass conditions prior to excavation work. In other words, it could provide a powerful tool for engineering geologists in evaluating geologic conditions particularly for construction purposes.
