摘要
与传统的结构加固刚性防护不同,本研究通过试验研究地冲击作用下,泡沫混凝土防护层对地下结构柔性防护的效果.研究表明,防护效果存在不同情况:当泡沫混凝土防护层通过动态土-结构相互作用减少的能量输入与其压缩吸收的能量之和大于因其厚度导致爆距变短引入的能量时,防护有效;反之,防护无效,甚至出现负效果.使用泡沫混凝土防护层对地下结构进行柔性防护时,需综合考虑地冲击的载荷特征、多孔固体防护层的压缩强度和厚度等多种因素,使由于动态土-结构相互作用减少的能量输入与压缩吸能之和大于由保护层厚度引入的入射能量,保证防护有效.
Underground structures are widely applied as they are difficult to be located,relatively resistant to airbursts and ground explosions.However,the development of penetrating weapons gives rise to increasing threat to underground structures.Different from conventional rigid protection with structural strengthening,the effectiveness of flexibly protected underground structures with foam concrete as protection layers subjected to ground shocks were experimentally investigated in the present study.It is found that subjected to such loading,there are different situations.If the sum of energy input reduction due to dynamic soil-structure interaction and energy absorption via compression,both by applying foam concrete layer,is greater than that induced by the shortened standoff distance between the structure and explosion,the protection is effective.Otherwise,the protection is ineffective or even negative.For effective flexible protection of underground structures with foam concrete,major aspects such as the characteristics of ground shock,the compression strength and thickness of porous solid layers should be taken into account in design to ensure the sum of reduced energy input with dynamic soil-structure interaction and energy absorption by foam concrete compression being greater than the excessive energy input due to shorter standoff distance.
作者
周宏元
李永胜
王小娟
杜建国
余尚江
陈荣华
ZHOU Hongyuan;LI Yongsheng;WANG Xiaojuan;DU Jianguo;YU Shangjiang;CHEN Ronghua(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Institute of Engineering Protection,IDE,AMS,PLA,Luoyang 471023,Henan,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2020年第6期533-539,共7页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(51808017,51778028)。
关键词
地冲击
地下结构
柔性防护
泡沫混凝土
结构防护
动态土-结构相互作用
ground shock
underground structure
flexible protection
foam concrete
structure protection
dynamic soil-structure interaction
