低速冲击条件下散体颗粒消波变形特性试验研究
Experimental Study on Wave Dissipation and Deformation Characteristics of Granular Particles Under Low-Velocity Impact Conditions
王宇 1严鹏志 1范鹏贤1
作者信息
- 1. 陆军工程大学 国防工程学院,江苏 南京 210007
- 折叠
摘要
为揭示水环境对地下防护结构分配层消波能力的影响规律,通过低速冲击试验研究了砂土和空壳颗粒两种散体材料的消波特性,得到了干燥/饱和、排水/不排水、密实/松散等工况下散体颗粒材料中的应力和变形的规律.结果表明,孔隙水对散体材料消波能力的发挥十分不利,不排水松散工况下砂土材料的消波能力仅为干燥工况下的 12.0%;空壳颗粒的消波能力显著优于砂土,在干燥松散、不排水松散、不排水密实和排水松散工况下,空壳颗粒试样的底端应力分别为砂土材料对应工况的 59.2%、70.8%、30.7%和36.1%;空壳颗粒在冲击过程中能够更好地保持可压缩性,不排水松散工况下传统消波材料的锁定应变仅为6.1%,而空壳颗粒锁定应变可达 42.2%,同时锁变模量仅为砂土的 28.5%.试验结果可为解决防护工程消波层水害问题提供思路和参考.
Abstract
In order to reveal the effect of the water environment on the wave-absorbing ability of the distribution layer of underground protective structures,the wave-absorbing properties of sand and hollow brittle particles were studied by low-velocity impact tests,and the stress and deformation patterns of the granular materials under dry/saturated,drained/undrained,dense/loose conditions were obtained.The test results show that pore water has a very adverse effect on the wave-absorbing ability of granular mate-rials,and the wave-absorbing ability of sandy materials under undrained loose condition is only 12.0%of that under dry condition.The wave-absorbing ability of hollow brittle particles is significantly better than that of sand soil.Under dry and loose conditions,undrained and loose conditions,undrained and dense conditions and loose drainage conditions,the bottom stresses of hollow brittle particles are 59.2%,70.8%,30.7%and 36.1%of that of sand materials under the corresponding working conditions,respec-tively.Hollow brittle particles can better maintain compressibility during the impact process.The locking strain of traditional wave absorbing materials is only 6.1%under undrained loose conditions,while the locking strain of hollow brittle particles can reach 42.2%,and the locking modulus is only 28.5%of that of sandy soil.The test results can provide ideas and references for solving the problem of water damage to wave protection layers.
关键词
散体颗粒/水环境/低速冲击/消波Key words
granular particles/water environment/low-velocity impact/wave dissipation引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据