Understanding failure mode in uniaxial and triaxial compression for a hard brittle rock

摘要

Numerous numbers of studies are done to understand the failure mechanism and mode of failure under various stress condition considering failure theories combined with various laboratory experiments. Various different types of failure modes are possible in rocks. Moreover the failure modes substantially vary with the effect of confining pressure. Rock under natural conditions experiences different stresses and fractures occur in a rock at a certain point when it crosses the threshold stress value. The rock fails with fractures developed from the coalescence of several micro cracks giving rise to different failure modes under various stress conditions. They provide useful information for safe and economic design of various geotechnical structures involving rock. The prediction of failure through better design will significantly reduce the costs involved in construction and increase in the safety. The present study is an attempt to review and understand the failure mechanism of hard brittle rocks like granite. This work aimed to understand the different failure modes of brittle rock under different stress conditions by conducting laboratory studies on rock samples (granulite) collected from Karimnagar district, Indian state of Andhra Pradesh. The various failure modes of the brittle rock samples under different uniaxial and triaxial compression are studied.