经历不同高温后砂岩的动态力学特性实验研究

陈腾飞; 许金余; 刘石; 王鹏; 方新宇

doi:10.11883/1001-1455(2014)02-0195-07

空军工程大学工程学院机场建筑工程系，陕西西安710038

中国人民解放军91531部队，海南三亚572000

西北工业大学力学与土木建筑学院，陕西西安710072

基金项目: 国家自然科学基金项目(51078350, 51378497)

详细信息

作者简介:
陈腾飞(1989—), 男, 博士研究生

中图分类号: O346.5; TU45

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被引次数: 21

Experimental study on dynamic mechanical properties of post -high -temperature sandstone

Department of Airfield and Building Engineering, Engineering College, Air Force Engineering University, Xi'an 710038, Shaanxi, China

Unit 91531 of PLA, Sanya572000, Hainan, China

School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China

Funds: Supported by the National Natural Science Foundation of China (51078350, 51378497)

More Information

Corresponding author: XuJin-yu, jyx369@yeah.net

摘要: 运用RX3 -20 -12型箱式电阻炉将砂岩试样分别加热至100、200、400、600、800和1 000℃，然后自然冷却至常温，制成经历不同温度的砂岩试件。运用直径为100mm的分离式Hopkinson压杆装置，用薄圆形紫铜片作为波形整形器，以不同弹速轴向冲击砂岩试样，测试经历不同温度后砂岩试样在不同冲击荷载下的动态力学性能，得出了砂岩的应力-应变曲线及各自的破坏形态。结果表明：常温下砂岩的动态压缩破坏的应力-应变曲线具有明显的4阶段特征，但经历100~400℃作用的砂岩应力-应变曲线的平台段消失，温度继续升高时平台段又重新出现；砂岩的峰值应变随温度升高而升高，动态压缩强度也随温度升高而升高，但在800℃以后陡然下降；砂岩的动态压缩破坏形态受温度和冲击荷载的共同影响，冲击荷载越大破碎程度越大，而且破坏过程总是由外层向内芯发展。

关键词:

Abstract: The sandstone samples were heated at the rising temperature rate of 10℃/min from 25℃ to 100, 200, 400, 600, 800 and 1 000℃, respectively, by using a RX3-20-12box-type resistance furnace.They were being kept at the corresponding temperatures for 3h.Then the heated sandstone samples were naturally cooled to 25℃.All the sandstone samples were divided into seven groups according to the temperatures undergone by them.By using a thin red copper circular plate as the pulse shaper, the sandstone samples were impacted by the different-velocity projectiles driven by a 100-mmdiameter split Hopkinson pressure bar setup.And the stress-strain curves of the sandstone samples subjected to impact were obtained as well as their failure modes.Experimental results show that the stress-strain curves of the sandstone samples at constant temperature obviously take on four stages, but the platform stages disappear in the stress-strain curves of the sandstone samples undergoing 100-400℃ and they appear again when the temperatures undergone by the sandstone samples continue to rise.As the temperatures undergone by the sandstone samples rise, their peak strains and stresses increase; but when the temperatures undergone exceed 800℃, the peak stresses fall suddenly.The impact load and the heat temperature can affect the failure mode of sandstone, the break degree increases with the increasing of the impact load and the damage develops from the outer of sandstone to the core.

Key words:

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