砂岩I型断裂过程区全过程发育曲线的声发射簇类研究

doi:10.3724/1000-6915.jrme.2024.0481

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摘要断裂过程区支配着岩石和准脆性材料I型裂缝的发育和扩展，其全过程发育曲线包含主要特征：断裂过程区达到充分发育的长度和相对应的载荷阶段。但由于观测手段和处理方法的局限，目前很少能从试验中获得这个高分辨率的全过程发育曲线。借助声发射技术对砂岩开展三点弯试验，通过改进声发射簇的分析方法和断裂过程区的计算方法，得到砂岩I型裂缝断裂过程区高分辨率的全过程发育曲线。主要研究结论如下：(1) 断裂过程区的全过程发育曲线与材料裂缝的发育模型相吻合，它不仅准确地提供断裂过程区发育完全的长度和载荷阶段，且表明了断裂过程区与材料相关；(2) 根据全过程发育曲线，以断裂过程区充分发育阶段为转折点，曲线可以明显分为2个阶段，即发育阶段和扩展阶段。在发育阶段，断裂过程区的长度随着外载荷的增加而增加，当外载荷达到峰值时，断裂过程区的长度继续增加直至充分发育；在扩展阶段，断裂过程区不再增加，但其长度测量值出现较明显的波动，这可能与断裂过程区扩展阶段的不稳定相关，但波动以充分发育长度为中心，因此可以认为其长度在扩展过程仍保持为常量。试验结果表明，I型裂缝的断裂过程区达到发育完全时所对应的载荷阶段为峰后90%，其长度接近峰值(9 mm)的2倍(17 mm)。通过局部声发射的试验测量验证了I型裂缝断裂过程区的完全发育阶段同黏聚力模型直接相关的结论。

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	张艳1
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	林青2
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	高跃2
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	潘鹏志4

关键词 ：岩石力学, 断裂过程区, 声发射, I型裂缝, 全过程发育曲线, 黏聚力模型

Abstract：A fracture process zone(FPZ) dominates the fracture initiation and propagation in rock and quasi-brittle materials. The complete development curve involves two FPZ characteristics：the fully-developed FPZ length and its corresponding loading stage. However，due to limitations in observation techniques and processing approaches，it is rare to have the full curve of the FPZ development in the literatures. In this study，a series of mode I sandstone beams under three-point bending are employed to induce the mode I fractures for laboratory testing，where acoustic emission(AE) is used to observe the fracture process. By employing an improved approach to analyze the AE cluster and determine the FPZ boundary，a full curve of the FPZ development in the mode I fracture is obtained. The main conclusions are as follows：(1) the derived curve of the FPZ development aligns well with the theoretical model，which not only provides accurate information of the FPZ(i.e.，the fully developed FPZ length and its corresponding loading stage) but also indicates that the FPZ is related to the material properties. (2) Based on the full curve，the FPZ can be divided into two parts：FPZ initiation and FPZ propagation，with the transition position occurring when the FPZ reaches its fully-developed stage. During the FPZ initiation，the FPZ length increases when the external load increases. Once the peak load is reached，the FPZ continues to grow until the fully-developed FPZ occurs. For the FPZ propagation，the length FPZ remains relatively constant，though fluctuations are observed in the curve，probably due to instability in FPZ propagation. However，these fluctuations are centered around the length of the fully developed FPZ，allowing it to be treated as a constant. Experimental results demonstrate that the FPZ in mode I fractures attains its fully developed stage when the external load exceeds the peak(at post-90%，indicating that the load is at 90% of the peak in the post-peak regime)，with its length nearly twice as the length observed at the peak(17 mm vs. 9 mm). This study confirms that the fully developed stage of the I-type fracture process zone is directly correlated with the cohesive force model through experimental measurements of local acoustic emission.

Key words： rock mechanics fracture process zone(FPZ) acoustic emission(AE) mode I fracture full curve of FPZ development cohesive zone model

引用本文:

张艳1，2，林青2，3，高跃2，3，潘鹏志4. 砂岩I型断裂过程区全过程发育曲线的声发射簇类研究[J]. 岩石力学与工程学报, 2025, 44(5): 1257-1270.
ZHANG Yan1，2，LIN Qing2，3，GAO Yue2，3，PAN Pengzhi4. The full curve of the FPZ development in a mode I fracture of sandstone by acoustic emission(AE) cluster#br#. , 2025, 44(5): 1257-1270.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0481 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I5/1257

[1]	ATKINSON B K. Fracture mechanics of rock[M]. [S. l.]：Elsevier，2015：7-10.
[2]	张登科，孟涛，韩阳，等. 不同裂缝扩展速率下北山花岗岩断裂特征及其演化机制研究[J]. 岩石力学与工程学报，2024，43(11)：2 712-2 725.(ZHANG Dengke，MENG Tao，HAN Yang，et al. Study on the fracture characteristics and evolution mechanisms of Beishan granite under different crack propagation rates[J]. Chinese Journal of Rock Mechanics and Engineering，2024，43(11)：2 712-2 725.(in Chinese))
[3]	唐梅荣，张广清，陈磊. 压缩应力作用下I型裂缝前端拉压分区特征研究[J]. 岩石力学与工程学报，2024，43(2)：322-332.(TANG Meirong，ZHANG Guangqing，CHEN Lei. Experimental investigation on tension zone in front of mode-Ι fracture under in-situ stresses[J]. Chinese Journal of Rock Mechanics and Engineering，2024，43(2)：322-332.(in Chinese))
[4]	ERARSLAN Nazife. 脆性岩石试样断裂过程区及宏观疲劳裂纹行为研究[J]. 岩土力学，2023，44(7)：2 041-2 049.(ERARSLAN Nazife. Investigation of the fracture process zone and behavior of the macro-scale fatigue cracks in brittle rock specimens[J]. Rock and Soil Mechanics，2023，44(7)：2 041-2 049.(in Chinese))
[5]	傅帅旸，李海波，李晓锋. 基于DIC方法与声发射的花岗岩断裂过程区范围研究[J]. 岩石力学与工程学报，2022，41(12)：2 497- 2 508.(FU Shuaiyang，LI Haibo，LI Xiaofeng. Research on the range of fracture process zone of granite based on DIC and acoustic emission[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(12)：2 497-2 508.(in Chinese))
[6]	安定超，张盛，张旭龙，等. 岩石断裂过程区孕育规律与声发射特征试验研究[J]. 岩石力学与工程学报，2021，40(2)：290-301. (AN Dingchao，ZHANG Sheng，ZHANG Xulong，et al. Experimental study on incubation and acoustic emission characteristics of rock fracture process zones[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(2)：290-301.(in Chinese))
[7]	BAZANT Z P，YU Q. Size-effect testing of cohesive fracture parameters and nonuniqueness of work-of-fracture method[J]. Journal of Engineering Mechanics，2011，137(8)：580-588.
[8]	BAZANT Z P. Concrete fracture models：testing and practice[J]. Engineering Fracture Mechanics，2002，69(2)：165-205.
[9]	WITTMANN F H，HU X Z. Fracture process zone in cementitious materials[J]. International Journal of Fracture，1991，51(1)：3-18.
[10]	DONG W，RONG H. Investigations on the FPZ evolution of concrete after sustained loading by means of the DIC technique[J]. Construction and Building Materials，2018，188：49-57.
[11]	MIHASHI H. States of the art and a view of the fracture mechanics of concrete[J]. Journal of Japan Concrete Institute，1987，25(2)：14-25.
[12]	LIN Q，WANG S，PAN P Z，et al. Imaging opening-mode fracture in sandstone under three-point bending：A direct identification of the fracture process zone and traction-free crack based on cohesive zone model[J]. International Journal of Rock Mechanics and Mining Sciences，2020，136：104516.
[13]	AGGELIS D G. Classification of cracking mode in concrete by acoustic emission parameters[J]. Mechanics Research Communications，2011，38(3)：153-157.
[14]	SCRUBY C B. An introduction to acoustic emission[J]. Journal of Physics E：Scientific Instruments，2007，20(8)：946.
[15]	OHTSU M. The history and development of acoustic emission in concrete engineering[J]. Magazine of Concrete Research，1996，48(177)：321-330.
[16]	TANG T X，BAZANT Z P，YANG S C，et al. Variable-crack one-size test method for fracture energy and process zone length[J]. Engineering Fracture Mechanics，2016，55(3)：383-404.
[17]	RADAJ D，ZHANG S. Process zone fracture criteria for crack tips[J]. Engineering Fracture Mechanics，2015，50(1)：111-120.
[18]	ZANG A，WAGNER F C，STANCHITS S，et al. Fracture process zone in granite[J]. Journal of Geophysical Research：Solid Earth，2000，105(B10)：23 651-23 661.
[19]	ISHIDA T，LABUZ J F，MANTHE G，et al. ISRM suggested method for laboratory acoustic emission monitoring[J]. Rock Mechanics and Rock Engineering，2017，50：665-674.
[20]	MAJI A，SHAH S P. Process zone and acoustic-emission measurements in concrete[J]. Experimental Mechanics，1988，28(1)：27-33.
[21]	ZIETIOW W K，LABUZ J F. Measurement of the intrinsic process zone in rock using acoustic emission[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(3)：291-299.
[22]	SAGAR R V，PRASAD B K R. A review of recent developments in parametric based acoustic emission techniques applied to concrete structures[J]. Nondestructive Testing and Evaluation，2011，27(1)：47-68.
[23]	MIHASHI H，NOMURA N，NIISEKI S. Influence of aggregate size on fracture process zone of concrete detected with three dimensional acoustic emission technique[J]. Cement and Concrete Research，1991，21(5)：737-744.
[24]	LANDIS E N，BAILLON L. Experiments to relate acoustic emission energy to fracture energy of concrete[J]. Journal of Engineering Mechanics，2012，128(6)：698-702.
[25]	AGGELIS D G. Classification of cracking mode in concrete by acoustic emission parameters[J]. Mechanics Research Communications，2018，38(3)：153-157.
[26]	OHNO K，UJI K，UENO A，et al. Fracture process zone in cracked concrete beam under three-point bending by acoustic emission[J]. Construction and Building Materials，2014，67：139-145.
[27]	ANDERSON TL. Fracture mechanics fundamentals and applications[M]. 3rd ed. Florida：CRC Press，2004：325-372.
[28]	LIN Q，WAN B，WANG Y，et al. Unifying acoustic emission and digital imaging observations of quasi-brittle fracture[J]. Theoretical and Applied Fracture Mechanics，2019，103：102301.
[29]	CARPINTERI A. Fracture and complexity one century since Griffith?s milestone[M]. Netherlands：Springer，2021：239-337.
[30]	SHEN B，PAULINO G H. Direct extraction of cohesive fracture properties from digital image correlation[J]. A Hybrid Inverse Technique，2011，51：143-163.