循环冲击荷载下的礁灰岩力学特性研究

doi:岩石力学；礁灰岩；陆源性岩石；力学性能；冲击荷载；应力–应变曲线

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摘要为了研究礁灰岩在冲击荷载作用下的破坏形态，选用2种礁灰岩和多种陆源性岩石试样进行静态力学试验研究，并利用分离式霍普金森压杆系统分析不同冲击气压下各类岩样的应力–应变变化规律；同时，借助LS- DYNA数值模拟软件探究3次循环冲击荷载下礁灰岩的动态力学性能。结果表明：礁灰岩静态力学性能与石膏较接近，远小于陆源性岩石，且破坏后具有一定的残余强度；而在动态冲击荷载下礁灰岩试样有明显的压实阶段，其动态抗压强度会随着应变率的增加而显著增大；另外，当循环冲击荷载较小时，礁灰岩试样应力–应变曲线在第1，2次冲击下呈闭口型或开口型，但在第3次冲击下均呈开口型，而当冲击荷载增大到一定值后，不同循环冲击次数下礁灰岩试样应力–应变曲线均呈开口型。

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	宋凯文1
	黄俊红2
	3
	罗忆1
	3
	魏小清1
	3
	郑世龙1
	李新平1
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	刘婷婷1
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关键词 ：岩石力学, 礁灰岩, 陆源性岩石, 力学性能, 冲击荷载, 应力&ndash, 应变曲线

Abstract：To study the failure mode of reef limestone under impact load，static mechanical tests are performed on two types of reef limestone and several terrigenous rock. And the stress-strain change laws of the rock samples under different impact pressures were analyzed using the split Hopkinson pressure bar system(SHPB). And explore the dynamic mechanical properties of reef limestone under three cycle impact loads with LS-DYNA numerical simulation software. The results show that the static mechanical properties of reef limestone are close to those of gypsum，far less than those of terrigenous rocks. And the reef limestone has a certain residual strength after failure. However，under dynamic impact load，the reef limestone has an obvious compaction stage. And its dynamic compressive strength will increase significantly with the increase of strain rate. In addition，when the cyclic impact load is small，the stress-strain curve of reef limestone sample is closed or open type under the first and second impacts，but it becomes open type under the third impact. When the impact load increases to a certain value，the stress-strain curve of reef limestone sample under different cyclic impact times is open type.

Key words： rock mechanics reef limestone terrigenous rocks mechanical properties impact load stress-strain curve

引用本文:

宋凯文1，黄俊红2，3，罗忆1，3，魏小清1，3，郑世龙1，李新平1，3，刘婷婷1，3. 循环冲击荷载下的礁灰岩力学特性研究[J]. 岩石力学与工程学报, 2023, 42(S2): 3956-3965.
SONG Kaiwen1，HUANG Junhong2，3，LUO Yi1，3，WEI Xiaoqing1，3，ZHENG Shilong1，LI Xinping1，3，LIU Tingting1，3. Mechanical properties of reef limestone under cyclic impact loading. , 2023, 42(S2): 3956-3965.

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http://rockmech.whrsm.ac.cn/CN/岩石力学；礁灰岩；陆源性岩石；力学性能；冲击荷载；应力–应变曲线或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/3956

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