전석원 교수

Dynamic fracturing behavior in brittle materials under blasting loading occurs in a very short time. It is usually challenging to observe the behavior experimentally. Therefore, visual observation of the fracturing behavior can be useful information for understanding dynamic fracturing and crack propagation process under blasting loading. In this study, dynamic fracturing behavior under blasting loading was investigated through experimental and numerical methods. Transparent and homogeneous PMMA

Cratering tests in rock are generally carried out to identify its fragmentation characteristics. The test results can be used to estimate the minimum amount of explosives required for the target volume of rock fragmentation. However, it is not easy to perform this type of test due to its high cost and difficulty in securing the test site with the same ground conditions as the site where blasting is to be performed. Consequently, this study investigates the characteristics of rock fragmentation b

Rock mass contains various discontinuities, such as faults, joints, and bedding planes. Among them, a joint is one of the most frequently encountered discontinuities in rock engineering applications. Generally, a joint exerts great influence on the mechanical and hydraulic behavior of rock mass, since it acts as a weak plane and as a fluid path in the rock mass. Therefore, an accurate understanding on joint characteristics is important in many projects. In-situ tests on joints are sometimes cons

Drilling and blasting, characterized by their efficiency, ubiquity, and cost-effectiveness, have emerged as predominant techniques in rock excavation; however, they are accompanied by enormous destructive power. Accurately controlling the blasting energy and achieving the directional fracture of a rock mass have become common problems in the field. A two-dimensional blasting (2D blasting) technique was proposed that utilizes the characteristic that the tensile strength of a rock mass is signific

Various numerical methods have been used to simulate the rock cutting process. Numerical simulation is a useful tool for estimating the performance of a cutting tool and for understanding the mechanism of rock cutting and interaction between a cutting tool and the rock. These methods supplement the rock cutting test, which is commonly referred to as the linear cutting machine (LCM) test. Mechanical excavators, such as roadheaders, longwall shearers, and trenchers, generally use pick cutters as t