含裂隙类岩石试样单轴抗压强度特征及裂纹演化规律

doi:10.12068/j.issn.1005-3026.2022.03.014

东北大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (3): 404-413.DOI: 10.12068/j.issn.1005-3026.2022.03.014

含裂隙类岩石试样单轴抗压强度特征及裂纹演化规律

孙浩^1,2，陈帅军^1,2，金爱兵^1,2，朱东风^1,2

(1. 北京科技大学金属矿山高效开采与安全教育部重点实验室，北京100083; 2. 北京科技大学土木与资源工程学院，北京100083)

修回日期:2021-04-29 接受日期:2021-04-29 发布日期:2022-05-18
通讯作者: 孙浩
作者简介:孙浩(1992-)，男，安徽阜阳人，北京科技大学讲师；金爱兵(1974-)，男，江苏兴化人，北京科技大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(52004017，52174106)；中国博士后科学基金资助项目(2020M670138)；中央高校基本科研业务费专项资金资助项目(FRF-TP-19-026A1，FRF-IDRY-20-021).

Uniaxial Compressive Strength Characteristics and Crack Evolution Laws of Rock-Like Samples with Flaws

SUN Hao^1,2， CHEN Shuai-jun^1,2， JIN Ai-bing^1,2， ZHU Dong-feng^1,2

1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines， University of Science and Technology Beijing， Beijing 100083， China; 2. School of Civil and Resource Engineering， University of Science and Technology Beijing， Beijing 100083， China.

Revised:2021-04-29 Accepted:2021-04-29 Published:2022-05-18
Contact: JIN Ai-bing
About author:-
Supported by:
-

摘要/Abstract

摘要： 通过研究含复杂裂隙岩体性质，甄别岩体中关键裂隙，进而简化裂隙网络.基于3D打印技术制备含裂隙类岩石试样，利用数字图像相关(DIC)技术和颗粒流软件PFC研究了试样应变场变化、试样内局部应力分布状态和破裂模式.研究结果表明:1)相较于完整试样，含水平裂隙试样的峰值强度降低了20.9%，含垂直裂隙试样的峰值强度仅降低3%左右，水平裂隙对试样的劣化效果更显著;2)水平裂隙中部拉应力远超垂直裂隙端部应力，因此含水平裂隙试样更易且更早产生拉伸裂纹，导致含水平裂隙试样强度低于含垂直裂隙试样强度;3)当十字交叉裂隙中垂直裂隙长度为水平裂隙长度的1~2倍时，十字交叉裂隙中的水平裂隙是控制试样裂纹演化及强度特征的关键裂隙，因此十字交叉裂隙可简化为水平裂隙.

关键词: 水平裂隙;垂直裂隙;强度特征;裂纹演化;数字图像相关技术;关键裂隙

Abstract: The fracture network was simplified by studying the properties of rock mass with complex fractures and identifying key fractures in rock mass. Based on 3D printing technology， rock-like samples with different flaws were respectively made. The digital image correlation(DIC)technology was used to monitor the strain field in the sample during loading. The particle flow code(PFC)was used to study the local stress distribution and failure mode in the samples. The main research results show that: 1) Compared with the intact sample， the peak strength of sample with horizontal flaws is reduced by 20.9%， and the peak strength of sample with vertical flaws is only reduced by about 3%. The degradation effect of horizontal flaws on the sample is more significant. 2) The tensile stress in the middle of the horizontal flaw is far greater than that in the end of the vertical flaw， so it is easier and earlier for the sample with horizontal flaw to produce tensile cracks， resulting in that the strength of the sample with horizontal flaw is lower than the sample with vertical flaw under the condition of equal flaw length. 3)When the length of vertical flaw in cross flaws is 1~2 times of the horizontal flaw length， the horizontal flaw in cross flaws is the key flaw to control the crack evolution and strength characteristics of samples， and the change of vertical flaw length has no significant effect on the crack evolution and strength characteristics of samples. Therefore， the cross flaws can be simplified as a horizontal flaw.

Key words: horizontal flaw; vertical flaw; strength characteristic; crack evolution; digital image correlation(DIC)technology; key flaw

中图分类号:

TU45

孙浩，陈帅军，金爱兵，朱东风. 含裂隙类岩石试样单轴抗压强度特征及裂纹演化规律[J]. 东北大学学报（自然科学版）, 2022, 43(3): 404-413.

SUN Hao， CHEN Shuai-jun， JIN Ai-bing， ZHU Dong-feng. Uniaxial Compressive Strength Characteristics and Crack Evolution Laws of Rock-Like Samples with Flaws[J]. Journal of Northeastern University(Natural Science), 2022, 43(3): 404-413.

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含裂隙类岩石试样单轴抗压强度特征及裂纹演化规律

Uniaxial Compressive Strength Characteristics and Crack Evolution Laws of Rock-Like Samples with Flaws

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