The Simulation on Millisecond Blasting of Submarine Hard Rock Using LS-DYNA Dynamic Analysis

摘要

Based on the principles of continuum mechanics and dynamical nonlinear finite element theory, the governing equations of explosives and rock are derived. Using the penalty functions method with erosion arithmetic, the corresponding finite element equations are established. During the submarine rock forming engineering, the dynamic responses in hard rock and the characteristics of blast dynamics are shown and analyzed with LS-DYNA software. The changes of stress fields and blasting effect for the back-rows millisecond blasting are also analyzed. The criterion of choosing millisecond time is given based on the present model. After the explosion, the rock near the bottom moves to the free surface and the damaging development is limited to the rock extruding. Using millisecond blasting between-rows reasonably the rock blasting quality could be enhanced by destroying the ores completely. Therefore, the millisecond blasting between-rows can meet the requirements of the pipe trench construction. This paper has reference value for pipe trench construction practice.