In situ determination of deformation modulus and poisson's ratio of a rock mass with hydraulic borehole pressure cells.
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona. Farmer IW, Dacmen JJK, Desai CS, Neuman SP, eds. Boston, MA: A. A. Balkema, 1987 Jun; :273-281
This paper proposes a new method of in situ determination of deformation modulus and poisson's ratio of a rock mass with hydraulic borehole pressure cells. These two geomechanics constants were determined using a combination of one cylindrical cell and two pre-encapsulated flat cells installed in a single borehole. A variety of states of stress can be generated by induced loading from mining or excavation for long-term tests, and by artificial loading imposed by flatjacks for quick tests. The required instrumentation was simple and inexpensive, and the test procedures were straightforward. The applicability and practicality of the technique was demonstrated by a long-term test conducted in a longwall panel at a coal mine. The investigation revealed the stress dependency of the deformation modulus and the poisson's ratio of this coal.
Mining; Rock mechanics; Boreholes; Geotechnical engineering; Environmental stress; Longwall mining; Underground mines; Coal mines; Coal mining; In situ mining
OP; Conference/Symposia Proceedings
Farmer IW; Dacmen JJK; Desai CS; Neuman SP
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona