A Case Study of in Situ Rock Deformation Behavior for the Design of Ground Support.
NTIS: PB/221-880 Available for Reference At Bureau Libraries :130 pages
The method of in situ deformation measurement used in this research proved to be satisfactory for obtaining initial elastic deformation and long-term deformation of rock masses immediately surrounding underground openings such as a drift. Technical difficulties were encountered during overcoring operation for ground stress determination, and improvements are needed for future application of the technique. The particular unidirectional borehole jacking technique used to determine in situ modulus of deformation was tentatively shown to be unsatisfactory. Laboratory testing data in rock strength and elastic parameters obtained were justified and may serve as close approximation to the actual values when suitable simulations of the actual conditions are met. The finite element methods used in this research proved useful in predicting and confirming field and laboratory data in all phases of this project even through a lot of estimation and personal judgment were still involved.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/221-880; Available for Reference At Bureau Libraries
University of Idaho