循环冲击损伤后大理岩静态断裂力学特性研究

doi:10.13722/j.cnki.jrme.2019.0323

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摘要为探究循环冲击损伤后大理岩的静态断裂力学特性，利用分离式霍普金森压杆(split Hopkinson pressure bar，SHPB)系统先对中心直切槽半圆盘(notched semi-circular bend，NSCB)试样开展固定气压下的循环冲击损伤试验，以制备不同初始损伤程度的一批试样，然后对其进行静态三点弯曲断裂试验。结果表明，在动态损伤试验中，随循环冲击次数增加，试样内部亚临界裂纹不断萌生并低速扩展，等能量冲击下其动态峰值应力和弹性模量均有所降低。在三点弯曲断裂试验中，静态断裂力学性能随试样累积损伤的增加而不断劣化：断裂韧度的最大降幅为52.37%，破坏位移最大增长140.49%；断裂韧度与动态累积损伤变量呈线性负相关关系，数据拟合的可决系数R2达0.98；声发射事件时间分布趋于均匀，总累计事件数大幅增加。试样破坏时从预制裂缝尖端处起裂，然后扩展至加载点，随冲击损伤的加剧，扩展路径趋于曲折，局部应变集中带能很好地预示其最终破坏形态。

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	付安琪1
	蔚立元1
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	苏海健1
	靖洪文1
	范鹏贤2
	张涛1

关键词 ：岩石力学, SHPB, 冲击损伤, 断裂韧度, 破坏形态

Abstract：To study the static fracturing characteristics of marble after cyclic impact damage，cyclic impact loading test under a fixed pressure of 0.10 MPa was carried out on notched semi-circular bend(NSCB) samples by using split Hopkinson pressure bar(SHPB) system for preparing the samples with different degrees of initial damage，and static three-point bending fracture test was performed on the damage samples. The results show that the sub-critical cracks in samples initiate and propagate continuously at a low speed with increasing cyclic impact number and the dynamic peak stress and elastic modulus decrease under equal energy impacts. In the three-point bending fracture test，the static fracturing mechanical properties of samples degrade with increasing the cumulative damage with a maximum decrease of 52.37% in fracture toughness and a maximum increase of 140.49% in failure displacement. There is a linear negative correlation between the fracture toughness and the dynamic cumulative damage with a coefficient of determination(R2) of 0.98. The time distribution of AE events tends to be uniform and the total cumulative number of events increases greatly with increasing sample damage. When the samples are damaged，the cracks begin at the tip of the prefabricated crack and then extend to the loading point. With increasing impact damage，the crack propagation path tends to be tortuous. The local strain concentration zone can well predict the final failure modes of samples.

Key words： rock mechanics SHPB impact damage fracture toughness failure morphology

引用本文:

付安琪1，蔚立元1，2，苏海健1，靖洪文1，范鹏贤2，张涛1. 循环冲击损伤后大理岩静态断裂力学特性研究[J]. 岩石力学与工程学报, 2019, 38(10): 2021-2030.
FU Anqi1，YU Liyuan1，2，SU Haijian1，JING Hongwen1，FAN Pengxian2，ZHANG Tao1. Experimental study on static fracturing mechanical characteristics of marble after cyclic impact loading. , 2019, 38(10): 2021-2030.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0323 或 http://www.rockmech.org/CN/Y2019/V38/I10/2021

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