带裂损隧道在爆炸作用下的二次损伤响应规律  

Secondary Damage Response of Cracked Tunnels under Explosion

作　　者：王桂林[1,2] 余浩 翟俊 陈相宇[1,2] 王润秋 龚晟 WANG Guilin;YU Hao;ZHAI Jun;CHEN Xiangyu;WANG Runqiu;GONG Sheng(School of Civil Engineering,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,Chongqing 400045,China;Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]库区环境地质灾害防治国家地方联合工程研究中心,重庆400045 [3]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《高压物理学报》2023年第5期195-206,共12页Chinese Journal of High Pressure Physics

基　　金：国家重点研发计划(2018YFB2101000)。

摘　　要：服役中的隧道结构通常存在初始裂损,当遇到爆炸作用时,隧道结构性能会受到影响。利用多级背景网格物质点法对爆炸作用下带裂损的地铁隧道的二次损伤响应规律进行了数值模拟。结果表明:在爆炸作用下,初始裂损的存在会导致衬砌结构的刚度下降,轨行区底板产生更大范围的损伤,二次损伤面积增大34.2%,此外,初始裂损会加快隧道结构的损伤速度。初始裂损的深度和长度会显著改变隧道结构及围岩的动力响应,随着衬砌裂缝深度增加,轨行区底板二次损伤面积近线性增加,当裂缝深度为衬砌厚度的一半时,围岩等效塑性应变峰值的增速最快;随着衬砌裂缝长度的增加,轨行区底板二次损伤面积、围岩塑性应变峰值和位移峰值逐渐增大,但增速逐渐减缓。Tunnel structures in service usually have initial cracking damage,which can affect the tunnel structure when exposed to explosive.In this paper,the secondary damage and response law of the subway tunnel with crack under explosion were simulated by using the material point method with multistage background grid.Under the explosion,the initial crack damage causes a decrease of the stiffness of the lining structure,and increases the damage range of the tunnel floor by 34.2%at the track zone.Besides,the initial crack accelerates the damage speed of the tunnel structure.The depth and length of the initial crack damage significantly alter the dynamic response of the tunnel structure and surrounding rock.The secondary damage area of the track floor increases linearly with the crack depth.When the crack depth reaches half of the lining thickness,the equivalent plastic strain peak increases the fastest.Moreover,the secondary damage area at the track floor,the peak plastic strain,and the peak displacement of the surrounding rock,all increase with the lining crack length,but the growth rate slows down gradually.

关 键 词：地铁隧道 初始裂损 爆炸作用 二次损伤 物质点法 

分 类 号：O382[理学—流体力学]