Improvement on the Calculation Method for Reflected Pressure of Shock Wave in Underwater Explosion
Gravity dam is a kind of common large concrete hydraulic construction. In order to explore a calculation method for the reflected pressure of shock wave applicable to the near area of hydraulic structure,a method for calculating the reflected pressure of shock wave of the underwater explosion on the rigid wall with clear physical connotation is derived strictly by using the three conservation basic relations of mass,momentum and energy on the shock wave front and the equation of state of condensed medium. Based on the relationship between shock wave velocity and particle velocity in continuous medium,the determination method of the state parameter k of water is given,and the law of state parameter k decaying exponentially with incident shock wave pressure is revealed. It is found that the change of k value has a significant impact on the calculation result of reflected pressure of shock wave when the incident pressure is above 725 MPa. By comparing with the calculation methods proposed by Cole[12],Henrych[14],and Luo,et al[15],and the numerical simulation,the results show that the proposed calculation method has a wider application scope and higher calculation accuracy,and it also reveals theoretically for the first time that the reflection pressure coefficient of underwater explosion shock wave ranges from 2. 00 to 4. 49.
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