固体爆炸作用下地铁站台及围岩的响应规律

Response Law of Subway Platform and Surrounding Rock under Solid Explosion

地铁站内发生爆炸将造成巨大的人员伤亡和财产损失。依托上海某地铁站工程,将HJC模型嵌入开源物质点法程序中,研究了固体炸药爆炸作用下地铁站台及围岩的响应规律。结果表明:受爆炸应力波的影响,站台顶板和底板响应压强在短时间内达到峰值后迅速降低,站台结构在爆炸过程中既存在受拉区又存在受压区;在站台边墙处,由于应力波与反射波叠加,会出现超压突变区;爆炸作用使站台结构整体下沉,且起爆点正下方围岩会形成塌陷坑,起爆点正上方围岩和车站结构相对周围向上隆起;结构受损区域主要集中在结构底板,呈椭圆形;站台有柱区域的抗爆能力强于无柱区域。

An explosion in the subway station will lead to huge losses of personnel and property.In order to study the response law of subway platform and surrounding rock of a subway station project in Shanghai under the action of solid explosive explosion,HJC model is embedded in the open source material point method program.The results show that the response pressure of platform roof and floor will decrease rapidly after reaching the peak in a short time under the influence of explosion wave,and the platform structure forms tension zone and compression zone during explosion.Due to the superposition of stress wave and reflected wave,overpressure sudden change zone will appear at the platform side wall.The whole platform structure sink under explosion.Moreover,the surrounding rock directly below the detonation point forms a collapse pit,and the surrounding rock directly above the detonation point and the station structure rises up.The damaged area is mainly concentrated in the bottom plate of the structure,and the damaged area is oval.The blast resistance of platform with column area is stronger than that without column area.