Research Of The Attenuation Rule Of The Water Shock Wave Effect For Underwater Drilling Blasting

Underwater blasting as an important engineering branch has a complex construction and high technical feature.After the Second World War,with the development of international shipping industry,countries in order to clear the channel to deepen the port construction,underwater blasting have been rapid development.In the process of underwater borehole blasting more of the engineering practice,the former Soviet Union and the United States and other scholars in some countries in charge of underwater blasting exposed a number of studies.But the underwater drilling study is much less.The theories fall behind the actual situation.First of all,based on the use of underwater explosions is different on the classification of underwater blasting and their classification.Introduced the study of underwater drilling blasting and research the history of the status quo,starting from the shock wave theory describes the wave propagation characteristics of the rock,the stress wave parameters and rock crushing theory.Analysis of damage in the course of rock by explosives stress wave generated by the destruction of rock a leading role,in the destruction of rocks are mainly tensile failure and shear failure,due to fracture of the existence of reflected waves on the rocks stretching back damage plays a very important role.Water environment from the impact of the performance of explosives,the bottom and surface of the water two aspects of the impact of the explosion in water on the blasting medium factor.Fluctuations in the principle of learning are given the volatility of underwater drilling blasting relations.By numerical simulation,using ANSYS / LS-DYNA software model for the establishment of underwater drilling and blasting obtained numerical computing underwater blasting process of drilling water hammer in the laws of wave propagation. The article first introduced the study of underwater drilling blasting and research the history of the status quo,starting from the fluctuation theory describes the wave propagation characteristics of the rock,the stress wave parameters and rock crushing theory.Pointed out the rock destroys process generated by the explosive blast of rock stress wave damage accounted for a dominant role.Destruction of the main rock shear destroys and tensile destroys.Due to destruction of the existence of reflected waves on the reverse of tensile failure of rock plays a very important role.Using ANSYS / LS-DYNA software gives complete underwater drilling and blasting method of modeling the process of numerical calculation in order to work out the specific parameters of the rock,explosives parameters,and water parameters under water blasting process of drilling water hammer wave propagation of the general law.In order to verify the credibility of numerical simulation,the article by numerical simulation and engineering,compared to the actual method.Through the numerical simulation results of the Yangtze River Academy of Sciences and Ministry of Water Resources Engineering Quality Inspection Center of Shanghai deep-water monitoring results of water hammer wave,compared to arrive at a numerical simulation and experimental results are basically the same order of magnitude in the results. Numerical simulation results proved the rationality and credibility.In this paper,we got following conclusions:(1)By using the ANSYS / LS-DYNA finite element simulation software to draw a different underwater drilling depth of the water hammer drilling blasting and the laws of wave propagation.(2)Through the simulation of Yang Shan Deepwater Port on an underwater borehole blasting,compared to the experimental situation,the numerical simulation to verify the credibility and accuracy,which proves that come to the law credibility of the underwater drilling blasting the water hammer wave propagation.