<正>The reduction and mitigation of blast-induced ground shock is an interesting topic in protection engineering,particularly for the protection of buried structures.Soft porous materials are usually used to form an isolation layer around the buried structures. However,the interaction of soft porous layer and surrounding geomedia as well as buried structures is not well understood. In this paper,the effects of soft layer barriers on the reduction of buried blast-induced ground shock are numerically studied.A numerical model is set up with two steel boxes symmetrically placed at two sides of the charge.One box is directly located in soil mass without production(unprotected) and the other is located behind a soft layer barrier (protected).The soft layer barriers include open trench,inundated water trench,in-filled geofoam with three densities,and a concrete wall.The mechanical behavior of soils is described by an elastoplastic constitutive model for soils and crushable materials.The numerical results are evaluated through different in-filled materials.These simulations show that both open trench and geofoam barriers can effectively reduce blast-induced stress waves.However,inundated water trench and concrete wall have almost no effect on the reduction of ground shock.Therefore,a geofoam barrier is more practicable and concrete barrier cannot effectively reduce ground shock in soil mass.
Ground shock;;open trench;;geofoam barrier;;interaction of soil-buried structure
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