... Abstract Blasting operation is performed to fracture and break rock into pieces for construction and aggregate processing. Bench height to burden ratio, also known as stiffness ratio, is an important blast parameter influencing rock fragmentation. This study aims to investigate the effect...

... produces squeezing action during the process of pressing into the rock, but the side of the cutter will also produce shearing action on the rock. (3) Tension. This theory was put forward by the Colorado School of Mines [4] , who believed that rock fragmentation was the result of the combined action...

... and the cohesive model into the virtual interface, the iron ore crushing simulation under different impact velocities was realized. The 2D single circular iron ore mesh and nine circular iron ores mesh with the diameter 3cm were established, the fracture and fragmentation process of iron ores under different...

... on result of ore fragmentation is very important and numerically analyzing its mechanism has a theoretical and practical significance. In this paper, we investigated the damage and fragmentation grain size of ore body in according to the priming methods such as collar, middle and bottom priming by using...

... ejection and block collapse. Temperature had no significant effect on the failure mode of specimens with perpendicular bedding planes, while specimens with horizontal bedding planes turned to splitting with the increasing temperature. Fractal dimension of fragmentation increased with the increasing...

... Abstract Numerical modelling of rock fragmentation by blast is an important step to the optimum fragmentation. Combined finite-discrete element method (FDEM) has recently been proven to be one of the most promising methods for modelling the fracture and fragmentation of rocks under various...

... on rock breaking effect will be significantly weakened. Furthermore, in the process of rock breaking, the rock mass basically shows brittle fracture, and the crack initiation stress of rock mass has a good positive correlation with the degree of rock fragmentation. The crack initiation location is often...

... knowledge management air deck isrm international symposium metals & mining blast hole kuz-ram model hydraulic fracturing rock fragmentation asian rock mechanics symposium 29 powder factor fragmented rock digging time Upstream Oil & Gas buma job site lati explosive...

... Some New Developments in Modelling the Failure, Fracture and Fragmentation of Rocks Robert W. Zimmerman* and Adriana Paluszny Department of Earth Science and Engineering, Imperial College, London, UK * Corresponding Author s E-mail: [email protected] ABSTRACT In this paper, several new...

... rock fragmentation experiment pressure ring Reservoir Characterization model 1 mechanism explosive energy utilization damage zone air deck crater blast formation mechanics Upstream Oil & Gas blast hole initiation rock mass fragmentation A study to simulate air deck crater blast...

... test sample mode-i fracture toughness University fragmentation load rate ISRM International Symposium 2010 and 6 th Asian Rock Mechanics Symposium - Advances in Rock Engineering, 23-27 October, 2010, New Delhi, India NON-UNIQUENESS OF STRENGTH AND FRACTURE PROPERTIES OF ROCK UNDER VARYING LOAD...

... ABSTRACT The generation and the role of the energy concentration effect are described in this paper, and the energy concentration effect, the rock fragmentation mechanism for wedge-shaped explosive are discussed. Through some model tests, the result of energy concentration blasting is obtained...