Direct Tension Test for Rock Material Under Different Strain Rates at Quasi-Static Loads

摘要

Mechanical properties of rock material under dynamic tension are important in evaluating the damage characteristics of rock structures such as rock caverns, rock slopes as well as rock foundations following explosion or earthquake. In this arena, since the 1960s, many experimental works have been conducted. Among these works, indirect dynamic tensile test methods, such as the Brazil and the split Hopkinson pressure bar (SHPB) test methods, were mainly employed to study the strength and deformation properties of rock material under dynamic tension. For example, through dynamic Brazil tests for dolerite and limestone, Price and Knill (1966) suggested that the tensile strength of both rocks generally increases with the increase of the loading rate.