.... While high compressive stresses and strains would cause problems in a shaft pillar, total extraction of the near shaft reef will result in a dislocation to the line of the shaft at the reef intersection and the shaft axis is placed in a state of induced tension. Three dimensional boundary element...

... ABSTRACT: Faults are dislocations between adjacent blocks in the bedrock. Since they constitute planes and zones of weakness with little tensional strength, they are apt to influence the process and results of rock excavation. The effect of faults on rock excavation depends on the initial rock...

.... As a matter of fact, although in-situ stress is lower in soft rocks, the deformation of the rock engineering would probably large and lead to failure due to its lower modulus of deformation and creep behaviour. During the construction of the Gezhouba Hydropower Station, large universally dislocations along...

... the shaft inoperative by all means. Filling of the quarry restricts the dislocations of shaft mouth whi- le excavating in the interval bet- ween levels +52 and -28 m. dith the excavation going still deeper, the effect of filling ceases, however the cumulative retardation in the dislocation of the shaft...