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爆炸对结构物的作用可以看成是冲击力和热的共同作用结果。基于Biot热弹性波动理论,利用饱和多孔介质热-流-固耦合动力响应模型,研究了饱和软黏土中隧道结构内受指数衰减热/力冲击荷载作用下的动力响应。利用Flügge薄壳理论,得到隧道结构的运动方程。考虑土-结构接触面上的协调条件并利用热-流-固耦合动力响应模型的通解,得到了热/力冲击荷载作用下应力、位移和孔隙水压力响应在Laplace变换域中的解。利用Laplace数值逆变换技术得到数值计算结果,探讨了冲击荷载和热荷载作用下隧道结构刚度和厚度对应力、位移和孔隙水压力响应的影响。结果表明:在爆炸冲击荷载作用下,隧洞衬砌对周围土体起到很好的屏蔽作用,且衬砌刚度越大,其保护效果越好;衬砌与土体接触面上应力随衬砌刚度增大而减小,并且刚度越大应力衰减越快;衬砌刚度和厚度对热冲击的位移响应有明显影响,而对其温度响应的影响较小。
The effect of the explosion on the structure can be seen as a combination of impact and heat. Based on the Biot thermo-elastic wave theory, the dynamic response of saturated soft clay subjected to exponential decay heat / force impact load in saturated soft clay was studied by using thermo-fluid-solid coupling dynamic response model of saturated porous media. Using Flügge thin shell theory, the tunnel equations of motion can be obtained. The solution of stress, displacement and pore water pressure responses in Laplace transform domain under thermal / hydraulic impact loads is obtained by considering the coordination conditions at the soil-structure interface and using the general solution of the thermo-fluid-solid coupling dynamic response model. Laplace numerical inversion technique was used to obtain the numerical results. The effects of tunnel structure stiffness and thickness on the stress, displacement and pore water pressure response under impact load and thermal load were discussed. The results show that the tunnel lining plays a very good shielding role on the surrounding soil under the blast impact load. The greater the lining stiffness, the better the protective effect. The stress on the contact surface between the lining and the soil increases with the increase of lining stiffness Decreases, and the greater the stiffness, the faster the stress decay; the stiffness and thickness of liner have a significant effect on the displacement response of thermal shock and have little effect on the temperature response.