A Study of the Behaviors -of Circumferential Strain in Creep Tests on Rock

摘要

The behaviors of circumferential strain in creep tests on Inada Granite and Kamisunagawa Sandstone were investigated. The following tests, as well as conventional creep and constant strain rate tests, were carried out:(1) Reloading tests were conducted by reloading at a constant strain rate in the way of the creep tests.(2) Unloading tests were conducted by unloading when the peak load appeared in the way of the constant strain rate tests.It was considered from the test results that (1) the points at which the magnitude of the circumferential strain rate reaches the minimum and the magnitude of the circumferential strain acceleration begins to increase are closely related to the point of maximum load in the constant strain rate tests, and (2) the magnitude of the circumferential strain could indicate the degree of rock damage in creep tests as well as in constant strain rate tests.