岩土力学2024，Vol.45Issue(8)：2232-2241,10.DOI:10.16285/j.rsm.2023.1862
珊瑚礁灰岩平板撞击试验与状态方程研究
Plate impact test of coral reef limestone and its state equation
摘要
Abstract
To study the shock compression behavior and equation of state of shallow coral reef limestone subjected to high-intensity dynamic loadings,we conducted plate impact tests using a one-stage gas gun technique at impact velocities ranging from 200 m/s to 500 m/s.Based on the particle velocity histories of samples free surface which were obtained by all-fiber displacement interferometer system for any reflectors,the interaction between the shock wave propagation and the evolution of internal pores was analyzed.The dynamic strength and the shock adiabatic relationship of shallow coral reef limestone under one-dimensional strain shock wave loading were determined.The results indicate that the shock wave expands into a two-wave configuration,comprising an elastic precursor wave and a deformation wave,within the tested samples.This phenomenon arises from irreversible plastic deformation mechanisms,including pore collapse and matrix slippage,under shock wave compression.The propagation speed and energy of deformation waves increase with rising impact pressure.The Hugoniot elastic limit value and dynamic yield strength of shallow coral reef limestone are 0.109±0.03 GPa and 0.074±0.02 GPa respectively under the strain rate range from 2.9×104 s-1 to 7.5× 104 s-1.A Hugoniot linear relationship for shallow coral reef limestone was established within the pressure range of 0.4 GPa to 1.2 GPa,and the corresponding pressure-specific volume curve exhibits distinct elastic and compaction stages.It is also found that compared with the shock adiabatic data of terrigenous porous limestone,the shallow coral reef limestone shows greater compressibility under intensive dynamic loadings.Eventually,the P-α equation of state was established to describe pore compaction process of shallow coral reef limestone at the low pressure region.关键词
岩石动力学/珊瑚礁灰岩/平板撞击/孔隙演化/冲击响应/状态方程Key words
rock dynamic mechanics/coral limestone/plate impact/pore evolution/shock response/equation of state分类
建筑与水利引用本文复制引用
马林建,邓家军,王明洋,李洪亚,李增,李干..珊瑚礁灰岩平板撞击试验与状态方程研究[J].岩土力学,2024,45(8):2232-2241,10.基金项目
国家自然科学基金优秀青年基金(No.52222110) （No.52222110）
江苏省自然科学面上基金(No.BK20211230) （No.BK20211230）
2023年度国家重点研发计划.This work was supported by the National Natural Science Foundation of China for Excellent Youth Program(52222110)and the General Program of Natural Science Foundation of Jiangsu Provincial(BK20211230)and the 2023 National Key Research and Development Program of China. （52222110）
