Numerical analysis of the tunnel-soil interaction caused by an explosion in the tunnel
Numerical analysis of the tunnel-soil interaction caused by an explosion in the tunnel
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DOI：
10.1016/j.soildyn.2018.09.010
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发表时间：
2019-07
影响因子：
4
通讯作者：
V. Osinov;S. Chrisopoulos;T. Triantafyllidis
中科院分区：
文献类型：
--
作者：
V. Osinov;S. Chrisopoulos;T. Triantafyllidis
本文提出了一种数值分析的动态变形的隧道衬砌和土壤所造成的爆炸引起的压力脉冲的一个中等幅度（几个兆帕）的隧道内。隧道衬砌是圆形的，由独立的混凝土线性弹性管组成。隧道位于15米深的完全饱和的粒状土壤中。连续应力变化由亚塑性模型描述。考虑了零绝对孔隙压力下孔隙水空化的可能性。这个问题是解决在一个二维平面应变与有限元程序Abaqus/标准制定。重点放在精细的空间离散化，以获得准确的解决方案。详细分析了衬砌和土体的应力和变形。该解决方案揭示了一个重要的作用，由于孔隙水空化的土壤行为的强非线性。
The paper presents a numerical analysis of the dynamic deformation of the tunnel lining and the soil caused by a blast-induced pressure pulse of a moderate amplitude (several megapascals) inside the tunnel. The tunnel lining is circular and consists of individual concrete linearly elastic tubbings. The tunnel is located at a depth of 15 m in fully saturated granular soil. Effective-stress changes are described by a hypoplasticity model. The possibility of pore water cavitation at zero absolute pore pressure is taken into account. The problem is solved in a two-dimensional plane-strain formulation with the finite-element program Abaqus/Standard. Emphasis is placed on fine spatial discretization in order to obtain accurate solutions. Stresses and deformations in the lining and in the soil are analysed in detail. The solutions reveal an important role of the strong nonlinearity in the soil behaviour due to the pore water cavitation.