Liquid carbon dioxide blasting technology has a wide range of applications and is characterized by sound fracturing effects, low vibration hazards, high safety. In order to investigate the characteristics mechanism CO2 phase change rock breaking, liquid tests on rock-like specimens were carried out in this paper. The results show that 130 MPa threshold value at which system moves from dynamic t...

Ground vibration induced by rock blasting is an unavoidable effect that may generate severe damages to structures and living communities. Peak particle velocity (PPV) the key predictor for ground vibration. This study aims develop a model predict PPV in opencast mines. Two machine-learning techniques, including multivariate adaptive regression splines (MARS) classification tree (CART), which ar...

air cooled blast furnace slag is a by product made of gradually air cooled molten blast furnace slag, and is often stored in stockpiles near the iron mills and usually occupy a wide area around the iron mills. from this perspective the further use of these materials can have its own merits. air cooled blast furnace slag can be used in asphalt mixtures because of their proper frictional properti...

The article presents the results of conditions circular distribution seismic vibrations generated during rock blasting. Scales Dynamic Influences [SWD] harmfulness vibration velocity on a two-storey building [SWDI] and five-storey building[SWDII] are given. value safe for construction buildings has been determined. They in Zone II Influence Scale SWD I II. magnitude components at same distance ...

Blast, Pyricularia grisea (Cooke) Sacc., is one of the most destructive diseases of rice worldwide and canresult in significant reductions in yield. The use of resistant cultivars is the most economical and effectiveway of controlling rice blast. A variety of DNA markers, including plant defense-related candidategene markers are available for genetic characterization and molec...

Extensive research has been focused on the progressive collapse analysis of buildings and most of them are based on the alternative path method (APM) with sudden removal of one or several columns. However, in this method the damage of adjacent elements of removed columns under blast conditions was ignored and this issue can lead to an incorrect prediction of progressive collapse. Therefore, in ...

Abstract In surface mines, bench blasting is a typical way of excavating hard rock mass. Although significant development has taken place in explosive technology but still only part the energy used to excavate and large proportion wasted away creates number nuisances. Backbreak, massive fragmentation, high-intensity ground vibration are all symptoms improper blasting. As result, production cost...

blast disease of rice caused by pyricularia oryzae is a potentially damaging disease in northern due to planting of susceptible local cultivars and favorable conditions. to assess the effects of blast on rice yield components and yield loss, one field experiment was conducted at the lowland culture conditions. analysis of blast effects on rice indicated that the maximum yield losses due to unpr...

The effect of a blasting vibration from an excavating tunnel on adjacent excavated is great importance for the stability and security twin tunnels. Due to relatively small distance between face concrete lining tunnel, impact could be significant should considered in practical project. In order control scales during excavation one minimize one, research based field-blasting tests performed tunne...