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Two new techniques developed in recent years by the LNEC for the in situ determination of deformability in rock masses are presented. One of them allows the determination of deformability along boreholes to depths exceeding 200 m by means of a dilatometer which was developed to operate in holes 7.6 cm in diameter that may contain water. The other technique allows the testing of large volumes of rock mass by means of thin flatjacks installed in slots cut in the rock mass by a diamond disk. Results of the application of these new techniques showing their reliability and accuracy and emphasizing their practical advantages are presented.
modulus of elasticity, rocks, rock properties, tests, deformation, boreholes, foundations, evaluation
Director, Laboratorio Nacional de Engenharia Civil (LNEC), Lisboa,