Abstract: Based on the river-crossing tunnel of Xiangyin road in Shanghai，elastic modulus and resistant coefficient of soil were analyzed with dynamic tri-axial test under the condition of nuclear blast. The results show that two parameters increase significantly. Load and structure model was performed and internal force of tunnel  was calculated in different load conditions. The results indicate that protective door can improve the anti-nuclear blast capability of tunnel structure and the river-crossing tunnel can meet the requirement of bearing capacity under grade-6 civil defense load.

Key words: river-crossing tunnel, nuclear blast, dynamic tri-axial test, elastic resistant coefficient, protective door