论文抢“鲜”看|中俄学者联手揭秘脆性岩石渐进破坏中裂纹生长方向的动态演变

本文简介：

压缩渐进失效过程中，脆性岩石内部细观裂纹扩展严重影响着深部地下工程安全稳定性。岩石外部剪切应力对细观裂纹扩展有着重要影响。然而，关于渐进性破坏过程中，岩石内部新生成的翼型裂纹扩展方向演化的理论机制研究较少。本文提出了一种新的分析方法，评价了剪切应力对脆性岩石渐进压缩破坏和细观裂纹扩展方向的影响。该模型由主压应力作用下的翼型裂纹扩展模型、一般应力、主应力与初始细观裂纹倾角的方向相关性，以及翼型裂纹长度与应变的关系组成。分析了剪切应力对y方向应力与翼型裂纹扩展关系、y方向应力与y方向应变关系的影响。确定了渐进式压缩破坏过程中剪应力对翼型裂纹扩展方向的影响规律。讨论了考虑剪切应力的渐进式压缩破坏过程中初始裂纹角对y向峰值应力和翼型裂纹扩展方向的影响。得到了翼型裂纹扩展方向随裂纹扩展呈U型变化的重要结论。实验和数值结果验证了分析结果的合理性。研究结果为深部地下工程围岩安全稳定性评价提供了理论支持。

Brief Introduction：

Microcrack growth during progressive compressive failure in brittle rocks strongly influences the safety of deep underground engineering. The external shear stress τxy on brittle rocks greatly affects microcrack growth and progressive failure. However, the theoretical mechanism of the growth direction evolution of the newly generated wing crack during progressive failure is rarely studied. A novel analytical method is proposed to evaluate the shear stress effect on the progressive compressive failure and microcrack growth direction in brittle rocks. This model consists of the wing crack growth model under the principal compressive stresses, the direction correlation of the general stress, the principal stress and the initial microcrack inclination, and the relationship between the wing crack length and strain. The shear stress effect on the relationship between y-direction stress and wing crack growth, and the relationship between y-direction stress and y-direction strain are analyzed. The shear stress effect on the wing crack growth direction during the progressive compressive failure is determined. The initial crack angle effect on y-direction peak stress and wing crack growth direction during the progressive compressive failure considering shear stress is also discussed. A crucial conclusion that the direction of wing crack growth has a U-shaped variation along with the growth of wing crack is found. The rationality of the analytical results is verified by the experiment and numerical results. The study results provide theoretical support for the evaluation of the safety and stability of surrounding rocks in deep underground engineering.

本文亮点： 

1. 提出了一种剪切应力对脆性岩石压缩渐进失效影响的解析解。

2. 确定了渐进失效过程中，脆性岩石内部新生成翼型裂纹扩展的方向。

3. 分析了剪切应力与初始裂纹倾向角度对岩石强度的综合影响。

Highlights：

1. An analytical solution of the shear stress effect on progressive compressive failure is proposed in brittle rocks.

2. The growth direction of the wing crack during progressive compressive failure is determined.

3. The coupled effect of shear stress and initial crack inclination on the rock strength is analyzed.

作者简介：

李晓照，北京建筑大学副教授。2016年于西安建筑科技大学获博士学位。研究领域为深部脆性岩石宏细观断裂力学方面的研究。第一作者发表中、英文专著各1部，SCI、EI检索论文40余篇。主持国家自然科学基金青年项目1项、中国博士后面上项目1项。获得2023年中国岩石力学与工程学会自然科学奖一等奖，2018年陕西省优秀博士论文奖。现任中国岩石力学与工程学会工程安全与防护分会、深地空间探测与开发分会理事。

Xiaozhao Li is an associate professor at Beijing University of Civil Engineering and Architecture. He received his PhD degree in geotechnical engineering from Xi’an University of Architecture and Technology in 2016. His research interest is focused on the theory of micro-macro fracture mechanics of brittle rocks. He has published two Chinese and English monographs and more than forty research papers including thirty SCI- and EI-indexed papers as first author. He presided over 1 program of the National Natural Science Foundation of China and 1 program of the Postdoctoral Science Foundation of China. He achieved the First prize in Natural science of the Chinese Society of Rock Mechanics and Engineering in 2023, and the Shaanxi Province Excellent Doctoral Dissertation Award in 2018. He is the members of the Engineering Safety and Protection Branch and the Deep Earth Space Exploration and Development Branch of the Chinese Society of Rock Mechanics and Engineering.

长按识别二维码下载阅读原文

欢迎下载阅读，并提宝贵意见，

期望得到您的宣传与推广。

Deep Underground Science and Egineering

《深地科学（英文）》（Deep Underground Science and Engineering）是由教育部主管，中国矿业大学主办的深地科学领域的第一本国际期刊，成功入选 ”中国科技期刊卓越行动计划高起点新刊项目”。主编是中国工程院院士谢和平教授，执行主编是新加坡工程院院士Chunfai Leung教授。与国际知名出版商 Wiley 合作，进行全球OA出版发行。已被ESCI、EI、Scopus、DOAJ、CNKI等数据库收录。

《深地科学（英文）》以创办高起点国际期刊，构建世界领先的专注于深地科学前沿研究的学术交流主流平台，建设成为世界一流科技期刊为目标，为打造“深地科学”联盟奠定基础，致力于引领“深地科学”研究，有望成为刊发该领域重要研究的战略前沿阵地。

《深地科学（英文）》欢迎广大学者积极投稿，共同努力将本刊建成世界一流的高水平期刊。出版费由期刊资助，您无需支付任何费用。

Deep Underground Science and Engineering (DUSE), as a new international and fully open access journal ,aims to build a mainstream academic exchange platform focusing on forefront research, and  to become a world-class scientific and technological journal.DUSE is currently indexed in prominent databases: ESCI、EI, CNKI, DOAJ and the Scopus database et al. 

The DUSE publishes the papers on important theoretical breakthroughs, valuable reviews of state-of-the-art, or discussions on the latest innovative, prospective, and leading achievements in the field of Deep Underground Science and Engineering. Papers on core fundamental research, revolutionary technology development, major engineering construction, special environmental effects, and other important related studies are also solicited.

DUSE intends to present the latest findings to help keep researchers worldwide abreast of the latest developments in the field and it welcomes papers with an emphasis on innovation, leading achievements, core research, theoretical breakthroughs and valuable reviews focusing on, but not limited to, the following topics:

刊登范围：

地质资源勘探与开采

Exploration and extraction of geo-resources

能源物质地下储存和提取

Energy extraction and storage

地下空间基础设施

Underground infrastructures

地质环境和废弃物地质处置

Geo-environments and waste geological disposal

深地空间科学实验

Research and testing space in deep underground

地下空间或地下工程规划，设计和施工技术

Plan， design and construction technology for underground space and engineering

文章类型：Research Article、Review Article、Case Study、Perspective、Short Communication、Commentary、Correspondence、Editorial.