Investigation of the Suitability of Simple Method for the Evaluation of Size Distribution of Fallen Rocks. Fundamental study on the evaluation of the largest rock size in a rock fall (2nd Report).

Evaluation of size distribution equation was carried out by eliminating some data that were obtained from a heap created along artificial and practical slopes, which has given the following results.(1) Simple sampling method from a heap becomes suitable when parameters of distribution equation are calibrated.(2) Deviation of rock size of 0.01% oversize estimated from calibrated distribution equation is 1.3-1.4 times larger than those estimated from distribution equation of feed.(3) This simple method is suitable to a practical heap in the field.(4) Size distribution equation can be used to estimate the maximum size of rocks under small probability by extending the distribution line.