基于SHPB的不同含水状态砂岩动态响应

发布时间：2018-09-01 09:58

【摘要】：为研究不同含水状态岩石力学性质的变化规律,并保证仅受含水量这一单一因素的影响,以砂岩作为试验材料,制备饱和系数分别为2.82%、52.11%、100%的干燥、半饱和、饱和三种不同含水状态的岩石试样,进行静载以及8种不同冲击能量作用下的动力学性质的研究.通过试验可知:在静载作用下,相比干燥岩石,半饱和、饱和岩石试样的应力-应变曲线随含水量增加出现了峰值明显降低的现象,抗压强度分别降低了8.12%、19.26%.动载作用下,随应变率的增加,3种岩石强度均呈现不同程度的线性变化,应力-应变曲线出现右移及峰值增加的现象,且干燥岩石与含水岩石在卸载阶段有明显不同的两种趋势,特别是在卸载第二阶段.而在相同冲击能量作用下,岩石的含水量越大,其破碎程度越大.
[Abstract]:In order to study the variation law of rock mechanical properties in different water-bearing states, and to ensure that it is affected only by the single factor of water content, the sandstone is used as the experimental material, and the saturation coefficient is 2.82% and 52.11%, respectively, which is dry and semi-saturated. The dynamic properties of rock samples saturated with three different water-bearing states under static loading and 8 different impact energies were studied. The experimental results show that the stress-strain curve of saturated rock decreases obviously with the increase of water content, and the compressive strength decreases by 8.12% and 19.26%, respectively, compared with dry rock and semi-saturated rock. Under dynamic loading, with the increase of strain rate, all three kinds of rock strength show varying degrees of linear variation, and the stress-strain curve appears to shift to the right and the peak value increases. There are two different trends between dry rock and water-bearing rock in unloading stage, especially in the second stage of unloading. Under the same impact energy, the greater the water content of rock, the greater the degree of breakage.
【作者单位】：山东理工大学资源与环境工程学院;中南大学资源与安全工程学院;
【基金】：国家自然科学基金资助项目(51404303) 山东省重点研发计划资助项目(2017CXGC1604)
【分类号】：TU45

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