爆炸载荷下砂岩动态断裂特性的试验研究

doi:10.13722/j.cnki.jrme.2018.1066

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摘要为研究爆炸载荷下砂岩的断裂特性，对3种砂岩试件进行爆炸试验，借助XRD(X-ray diffraction)衍射图谱分析测试和SEM(scanning electron microscope)电镜扫描，研究砂岩的成分、预制裂纹的扩展断裂面微观结构等，利用有限元软件ABAQUS建立数值计算模型，通过试验–数值法得出I型裂纹的裂纹扩展速度、动态断裂韧度等参数。试验结果表明：(1) 炮孔周边的砂岩主要以塑性破坏为主，扩展裂纹断面的破坏形态主要以脆性断裂为主，3种砂岩成分的不同表现出微观晶体破坏形式、裂纹扩展速度、断裂韧度等的不同；(2) 动态裂纹的扩展速度不是一个定值，在扩展过程中有起伏变化，黑砂岩的速度要高于红砂岩和青砂岩；(3) 黑砂岩的动态起裂韧度要高于红砂岩和青砂岩，并且动态扩展韧度与扩展速度基本成反比关系。

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	刘瑞峰1
	2
	朱哲明1
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	刘邦1
	2
	万端莹1
	2
	李盟1
	2

关键词 ：岩石力学, 爆炸载荷, 砂岩, 扩展速度, 断裂韧度

Abstract：In order to study the fracture characteristics of sandstones under blasting loads，blast tests were carried out on three kinds of sandstone specimens. By X-ray diffraction analysis and scanning electron microscope，the composition of the sandstones and the microstructure of the propagation fracture surface of pre-cracks were studied respectively. A numerical calculation model was established by ABAQUS code and the parameters of mode I crack such as the crack propagation speed and the dynamic fracture toughness were obtained by using experimental-numerical method. The test results show that the main failure mode of the sandstone around the borehole is plastic failure，that the main failure mode of the crack propagation section is brittle fracture and that the different compositions of the three sandstones result in different failure modes of microcrystal，different crack propagation speeds and different fracture toughnesses. The propagation speed of the dynamic crack is not a constant，and the propagation speed and the dynamic initiation toughness of the black sandstone are higher than those of the red and green sandstones. It is also shown that the dynamic propagation toughness is inversely proportional to the propagation speed.

Key words： rock mechanics blasting loads sandstone propagation speed fracture toughness

引用本文:

刘瑞峰1，2，朱哲明1，2，刘邦1，2，万端莹1，2，李盟1，2. 爆炸载荷下砂岩动态断裂特性的试验研究[J]. 岩石力学与工程学报, 2019, 38(3): 445-454.
LIU Ruifeng1，2，ZHU Zheming1，2，LIU Bang1，2，WAN Duanying1，2，LI Meng1，2. Experimental study on dynamic fracture characteristics of sandstones under blasting. , 2019, 38(3): 445-454.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1066 或 http://www.rockmech.org/CN/Y2019/V38/I3/445

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