预加轴压干湿循环作用砂岩动态力学试验与能耗特征

平琦; 李园; 张波波; 席章鹏; 李甲凯

文章摘要

预加轴压干湿循环作用砂岩动态力学试验与能耗特征

Dynamic Mechanical Tests and Energy Dissipation Characteristics of Sandstone Subjected to Wet-Dry Cycles under Pre-axial Compression

投稿时间：2026-06-01 修订日期：2026-07-03

DOI：

中文关键词: 干湿循环动静组合加载 SHPB试验能量耗散破坏模式

英文关键词: wet-dry cycles dynamic and static combined loading SHPB test energy dissipation failure mode

基金项目:国家自然科学(52074005,52074006)；安徽高校学科(专业)带头人培育项目(DTR2025012)

作者	单位	邮编
平琦	安徽理工大学土木建筑学院	232001
李园^*	安徽理工大学土木建筑学院	232001
张波波	安徽理工大学土木建筑学院
席章鹏	安徽理工大学土木建筑学院
李甲凯	安徽理工大学土木建筑学院

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中文摘要:

为研究应变率和轴压对干湿循环砂岩力学行为的影响,利用SHPB试验系统对干湿循环砂岩试件进行一维动静组合冲击加载试验。设置预加轴压和无轴压两种工况,开展不同冲击加载速率压缩试验。结果表明：两种加载方式下试件应变率均与冲击加载速率呈线性关系增大；预加轴压时应变率为55s-1和91s-1下动应力-应变曲线峰值后出现回弹现象,而无轴压时曲线呈现弹性变形、屈服和破坏3个阶段；预加轴压可提升试件动态强度增长因子、减小动应变,且二者均随应变率呈幂函数增大。破坏形态上,预加轴压时试件呈现张拉与剪切共存的复杂破碎特征,无轴压时试件以张拉劈裂破坏为主；碎块平均粒径随应变率增大而减小；应变率为104s-1~173s-1时,预加轴压时试件碎块平均粒径小于无轴压时试件。单位体积吸收能随入射能增大而增大；相同入射能下,预加轴压时试件单位体积吸收能更低,且碎块平均粒径均与单位体积吸收能呈二次函数负相关。能量分配方面,能量反射率和吸收率均随应变率增大而升高,而能量透射率随之降低；相同应变率下,预加轴压时试件能量反射率和吸收率整体小于无轴压时试件,而能量透射率大于无轴压时试件。

英文摘要:

In order to study the influence of strain rate and axial compression on the mechanical behavior of wet-dry cycles sandstone, the Split Hopkinson Pressure Bar (SHPB) system was used to carry out one-dimensional dynamic and static combined impact loading test on wet-dry cycles sandstone specimens. Two working conditions of pre-axial compression and no axial compression were set up to carry out compression tests at different impact loading rates. The results show that the strain rate of the specimens increases linearly with the impact loading rate under the two loading modes. The rebound phenomenon occurs after the peak of the dynamic stress-strain curves at strain rates of 55 s-1 and 91 s-1 under pre-axial compression, while the curves show three stages of elastic deformation, yield and failure without axial compression. Preloading axial compression can enhances the dynamic increase factor of the specimens and reduces the dynamic strain, and both of them increase with the strain rate in a power function. In terms of failure modes, the specimens under pre-axial compression show complex fracture characteristics of coexistence of tension and shear, and the specimens without axial compression are mainly tensile splitting failure. The average fragment size decreases with the increase of strain rate. At strain rates ranging from 104s-1 to 173s-1, the average fragment size of specimens under pre-axial compression is smaller than that without axial compression. The absorption energy per unit volume increases with the increase of incident energy. Under the same incident energy, the unit volume absorption energy of the specimens under pre-axial compression is lower, and the average particle size of the fragments is negatively correlated with the unit volume absorption energy. In terms of energy distribution, the energy reflectivity and absorption rate increase with the increase of strain rate, while the energy transmittance decreases. At the same strain rate, the energy reflectivity and absorption rate of the specimens under pre-axial compression are smaller than those of the specimen without axial compression, while the energy transmittance is larger than that of the specimens without axial compression.

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