Pillar strength prediction from representative sample of hard rock

✍ Scribed by B. Košťák

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 410 KB
• Volume: 8
• Category: Article
• ISSN: 0148-9062
• DOI: 10.1016/1365-1609(71)90016-5

✦ Synopsis

The suggested method of pillar strength prediction makes use of the cumulative distribution function of strength as of the basic characteristic of a heterogeneous rock. It is argued that a certain failure probability can be found that is supposed to be close to constant for various types of hard rock under standard loading conditions. From earlier experiments on feldspathic sandstone the probability was calculated as p = 11" 5 per cent. The strength related to this probability in the cumulative distribution function is the prediction of pillar strength for any particular rock. A representative sample of that rock must be obtained that would preserve defects in the correct proportion to the sound rock. A number of 40 specimens is recognized as a minimum.