Experimental Study of Development of Fracture Process Zone in Rock

IF 1.7 Q3 ENGINEERING, GEOLOGICAL

Geotechnical and Geological Engineering Pub Date : 2023-09-29 DOI:10.1007/s10706-023-02651-x

Yang Qiao, Zong-Xian Zhang, Sheng Zhang

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Abstract

Abstract By means of digital image correlation (DIC) technology, the displacements and strains on the fracture ligaments of rock specimens were measured during loading. By analyzing the displacement distribution of each fracture ligament at different loading stages, the displacement fluctuation coefficient method was proposed to describe the development of fracture process zone (FPZ). The method can amplify the variation of displacement and clearly show the length of FPZ.The results show that: (1) the initiation of FPZ occurred at 77–89% of the peak load and the fluctuation coefficient of horizontal displacement around the crack tip reached the order of 10 –7 . (2) The initial length of FPZ was about 1.0–3.1 mm, which is 2 to 6 times the largest grain sizes. As the peak load was approached, the length of FPZ suddenly increased to 4.6–6.1 mm. (3) When a fracture process zone was initiated, the strain at the front end of the FPZ was about 3000–4000 µε. After the load approached the peak value, the strain at the rear end of the FPZ finally reached a peak value of 8000–11000 µε in all specimens.

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岩石断裂过程带发育的实验研究

摘要采用数字图像相关(DIC)技术，测量了岩石试件在加载过程中断裂韧带的位移和应变。通过分析各断裂韧带在不同加载阶段的位移分布，提出位移波动系数法来描述断裂过程区(FPZ)的发展。该方法可以放大位移的变化，清晰地显示出FPZ的长度。结果表明:(1)FPZ发生在峰值荷载的77 ~ 89%，裂纹尖端周围水平位移波动系数达到10 ~ 7数量级;(2) FPZ的初始长度约为1.0 ~ 3.1 mm，是最大晶粒尺寸的2 ~ 6倍。(3)当断裂过程区启动时，FPZ前端应变约为3000 ~ 4000µε;在荷载接近峰值后，FPZ后端应变最终在所有试件中达到8000 ~ 11000µε的峰值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geotechnical and Geological Engineering ENGINEERING, GEOLOGICAL-

CiteScore

3.70

自引率

5.90%

发文量

298

期刊介绍： Geotechnical and Geological Engineering publishes papers in the areas of soil and rock engineering and also of geology as applied in the civil engineering, mining and petroleum industries. The emphasis is on the engineering aspects of soil and rock mechanics, geology and hydrogeology, although papers on theoretical and experimental advances in ground mechanics are also welcomed for inclusion. The journal encompasses a broad spectrum of geo-engineering although several areas have been identified which will be given particular priority: Soil and rock engineering; Foundation engineering; Applied geology for design and construction; Geo-environmental engineering; Earthquake engineering and dynamic behavior of soils and rocks; Geohazards and mitigation; Mining engineering; Geotechnical aspects of petroleum engineering; Information technology applications in geo-engineering; Novel geotechnical construction techniques; Case histories describing important geo-engineering projects. Geotechnical and Geological Engineering publishes contributions in the form of original and review papers, or as short technical notes.