A FEW ROCK MECHANICS PROBLEMS IN CORRELATING LABORATORY RESULTS WITH PROTOTYPE REACTIONS,
Abstract
Consideration of the application of laboratory test results in prediction of the reaction of a rock massif led to the conclusion that physical properties of rock should be measured to provide data on rock necessary for engineering design. One approach for such correlation was a field test on a small-scale model of a prototype for the proposed underground storage of gas. Laboratory tests of the dacite porphyry indicated too broad a range of data to provide a safe factor for prototype design so that determination of rock modulus by field test appeared desirable. Maximum 400-psi pressure was not achieved in the steel-linetest chamber since the steel lining ruptured at 2650 psi. Conclusions of the project are that geological defects in rock massif are a prime consideration in determining the deformation modulus of rock. A reasonable safety factor for design purposes would require a design modulus about onetenth of the laboratory modulus. Also, when grouting must be used to produce a monolithic rock mass, with resultant improvement in elastic modulus of the massif, there must be enough coring and seismic testing to determine whether there is effective grout penetration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1963
- Accession Number
- AD0608408
Entities
People
- Wm. R. Judd
Organizations
- RAND Corporation