为研究水下爆炸条件下断面形式对悬浮隧道结构响应和抗冲击性能的影响，采用LS-DYNA有限元软件建立圆形、椭圆形和长方形3种断面悬浮隧道的数值计算模型，进行动力响应数值模拟分析。对比分析3种断面悬浮隧道在爆炸作用下管体位移、压力及有效应力的响应特性。结果表明： 1)圆形断面悬浮隧道受爆炸影响的范围最小，位移、压力和有效应力峰值最低，安全系数最高，抗冲击波性能最优； 2)椭圆形和长方形断面管体更易发生局部应力集中，尤其长方形断面的压力和有效应力峰值都高于圆形和椭圆形断面，抗冲击性能较差； 3)椭圆形断面悬浮隧道的竖向位移要大于长方形断面，但长方形断面位移变形存在明显畸变。综合分析表明，圆形断面悬浮隧道的抗爆性能优于椭圆形和长方形断面。
To investigate the effect
of the crosssectional shape of a submerged
floating tunnel(SFT) on its structural response and impact resistance under
underwater explosion conditions, the LSDYNA finite
element software is used to establish numerical models for circular,
elliptical, and rectangular SFT crosssections. This
enables the simulation and analysis of their dynamic responses. A comparative
analysis is conducted on the three tunnel crosssections
during explosions, focusing on tube displacement, pressure, and effective
stress response characteristics. The results are summarized as follows. (1) The
circular section of the SFT is impacted by explosions over the smallest range,
exhibiting the lowest values for displacement, pressure, and effective stress peaks,
along with the highest safety factor and shock wave resistance. (2) The
elliptical and rectangular sections show a higher tendency to experience local
stress concentrations. In particular, the rectangular section exhibits higher
pressure and effective stress peak values than the circular and elliptical
sections, indicating poorer impact resistance. (3) The vertical displacement of
the elliptical section is larger than that of the rectangular section;
meanwhile, the displacement and deformation of the rectangular section are
notably distorted. In summary, the comprehensive analysis reveals that the
circular SFT section offers better blast resistance than the elliptical and
rectangular sections.
