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A Method for Computing Stabilization Pressures for Excavations in Incompetent Rock With Computer User Information.

Authors
Dixon-JD; Mahtab-MA
Source
NTIS: PB 252 902 :41 pages
Link
NIOSHTIC No.
10000795
Abstract
This Bureau of Mines report describes a technique for determining the confining pressures that must be provided for stabilizing underground openings in incompetent rock. The technique is adapted for use with a nonlinear finite-element computer code, nonsap, to obtain stabilization pressures for linear or nonlinear stress distributions in the rock media around the excavation. This analysis permits a point-wise calculation of active rock pressures that depend on the values of shear stress and strength along the excavation surface. The approach is applied to the solution of several sample problems. The results show that both the magnitude and the distribution of stabilizing confining pressures are significantly influenced by rock and joint strengths, joint orientation, and biaxial nature of the load field.
Publication Date
19760101
Document Type
IH; Report of Investigations
Fiscal Year
1976
NTIS Accession No.
PB-252902
NTIS Price
A04
Identifying No.
RI 8128
NIOSH Division
DRC;
Source Name
NTIS: PB 252 902
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