... Abstract Biaxial stress field is one of the classical forced states of surrounding rock in underground group caverns. So far, the data of biaxial compressive test of rock is still so less. In this note, macroscopic stress-strain curve is given in different loading path while free surfaces...

... by blasts is the dynamic tensile fracture in underground mines. Theoretically, a tensile stress wave from a free surface is the major reason for such dynamic fracture. To confirm this, the paper presents a single shot and production blast tests in LKAB Malmberget mine. The result from the single shot...