1、第 5 卷第 3 期 采矿与岩层控制工程学报 Vol.5 No.3 2023 年 6 月 JOURNAL OF MINING AND STRATA CONTROL ENGINEERING June 2023 033023-1 王波，陆长亮，崔峰，等.基于CT扫描岩石蠕变扰动特性单轴压缩试验研究J.采矿与岩层控制工程学报，2023，5(3)：033023.WANG Bo，LU Changliang，CUI Feng，et al.Uniaxial compression test research on rock creep disturbance characteristics based on
2、 CT scanningJ.Journal of Mining and Strata Control Engineering，2023，5(3)：033023.基于CT扫描岩石蠕变扰动特性单轴压缩试验研究 王 波1，陆长亮1，崔 峰2，张 震3 (1.华北科技学院 应急技术与管理学院，河北 三河 101601；2.西安科技大学 能源学院，陕西 西安 710054；3.武汉科技大学 资源与环境工程学院，湖北 武汉 430081)摘 要：工程深部开采活动中，岩石周围应力环境较为复杂，且对扰动作用极为敏感。在已经提出的岩石“蠕变扰动效应”以及“强度极限邻域”概念的前提下，利用CT技术手段对岩石“强度
3、极限邻域”内、外进行微观扫描探测，观察岩石内部损伤变化过程，同时运用单位像素坐标点建立孔隙之间距离，并结合工程实例得出以下结论：分析横、纵应力-应变曲线可知，岩石在纵向与横向同时存在一个长期强度，且岩石进入横向长期强度优先纵向，但是通过CT扫描岩石内部孔隙结构变化可知，岩石纵向长期强度阈值相比横向更准确；通过分析岩石轴向CT扫描图，在轴压45 MPa时，岩石内部只出现新的较少孔隙结构，且内部孔隙并未出现相连贯通现象；而在轴压50 MPa时，未扰动时就可清楚看出岩石内部新的孔隙结构出现贯通现象，随着扰动的施加，岩石内部出现明显的裂痕条纹，说明岩石“强度极限邻域”为4550 MPa，可知以纵向长期
4、强度判断“强度极限邻域”更具有说服力；对CT扫描后的岩石试件进行伪彩色处理，利用岩石像素特征点之间的距离建立孔隙之间的距离，通过分析轴压40 MPa与45 MPa下岩石扰动前后的像素特征点之间距离可知，其只是略微的增加或减少；而在轴压50 MPa下，岩石扰动前后像素特征点坐标值出现突增，像素特征点间的距离增加了214.27，说明岩石“强度极限邻域”为4550 MPa，且岩石在此轴压时对扰动极为敏感；结合工程实例分析，判断其岩石“强度极限邻域”，通过应变曲线变化范围为工程实例及时提供有效预警，同时也为地下工程的岩石扰动提供理论依据。关键词：CT扫描；长期强度；强度极限邻域；像素距离；孔隙之间距离
5、；横向变形；纵向变形 中图分类号：TD315 文献标志码：A 文章编号：2096-7187(2023)03-3023-11 Uniaxial compression test research on rock creep disturbance characteristics based on CT scanning WANG Bo1，LU Changliang1，CUI Feng2，ZHANG Zhen3(1.School of Emergency Technology and Management，North China University of Science and Technolo
6、gy，Sanhe 101601，China；2.College of Energy Engineering，Xian University of Science and Technology，Xian 710054，China；3.College of Resource and Environmental Engineering，Wuhan University of Science and Technology，Wuhan 430081，China)收稿日期：2022-09-06 修回日期：2022-12-16 责任编辑：施红霞 基金项目：国家自然科学基金资助项目(51774195)；河北省
7、自然科学基金面上资助项目(E2022508023)；中央引导地方科技发展资金资助项目(226Z41 01G)作者简介：王波(1981)，男，山东阳谷人，教授，博士，主要从事矿山岩体力学与软岩巷道支护等方面的研究工作。E-mail： 通信作者：陆长亮(1993)，男，河南信阳人，硕士研究生，主要从事软岩巷道支护等方面的研究工作。E-mail： DOI:10.13532/10-1638/td.2023.03.002 王波等：采矿与岩层控制工程学报 Vol.5，No.3(2023)：033023 033023-2 Abstract：During engineering deep mining act
8、ivities，the stress environment surrounding the rocks is highly complicated and particularly susceptible to the impacts of disruption.The concept of creep perturbation effect and strength limit neighborhood of rocks is used to investigate the damage process inside and outside the strength limit neigh
9、borhood of rocks using CT technology for the first time.This investigation is based on the concept of creep perturbation effect.Using the microscopic sweeping probe，one can witness the process of the rock being damaged from the inside.At the same time，the distance between pores is calculated by maki
10、ng use of the coordinates of unit pixels，and the subsequent conclusions are arrived at by integrating this information with engineering examples.Analysis of stress-strain curves reveals that the rock exhibits long-term strength in both the longitudinal and transverse directions，with the longitudinal
11、 direction demonstrating a higher preference for entering the transverse long-term strength.The study of pore structure changes through CT scans suggests that the longitudinal long-term strength threshold of the rock is more accurate than the transverse threshold.Under an axial pressure of 45 MPa，th
12、e rocks CT scan reveals a new pore structure with fewer pores inside the rock，which appears unconnected or punctured.Even under an axial pressure of 50 MPa，the penetration of new pore structures into the rock remains unaffected.Distinct fracture tracks are visible，indicating the presence of a streng
13、th limit neighborhood between 45 MPa and 50 MPa.The rock exhibits considerable strength，particularly when the strength limit neighborhood is defined longitudinally.Pseudocoloration techniques were used to calculate the distance between pores based on the pixel separation.A comparison and analysis of
14、 axial pressures at 40 MPa and 45 MPa showed a reduction in pixel distance，while at 50 MPa，there was a sudden increase of 214.27 pixels before and after disturbance.This indicates the existence of a strength limit neighborhood between 45 MPa and 50 MPa，where the rock is highly sensitive to disturban
15、ce.By combining analysis with actual engineering examples，the determination of the rocks strength limit neighborhood allows for effective early warning based on changes in strain curves.This approach provides a theoretical foundation for underground engineering.Key words：CT scan；long term strength；s
16、trength limit neighborhood；pixel distance；distance between pores；lateral deformation；longitudinal deformation 随着我国地下工程由浅部逐渐向深部发展，致使围岩受开采影响而重新分布应力，岩石的蠕变问题较为显著，同时由于巷道内存在各种形式的机械振动与采动影响，致使处于深部复杂应力的围岩 极易发生扰动破坏。研究围岩受扰动作用下内部微观的损伤变化不仅可为“强度极限邻域”划分提供理论依据，还可为巷道围岩支护提供理论指导。“强度极限邻域”的概念由高延法1-3提出，即对岩石所处的应力状态而言，由于岩石受到压(拉、剪)应力时，其存在一个强度极限值0，给定一个，当0|-时，说明岩石处于“强度极限邻域”内；同时高延法1-3还提出“岩石蠕变扰动效应”的概念，并通过自主研发的试验设备，进行了单、三轴蠕变扰动试验，建立了相应的本构模型。在岩石蠕变研究方面，刘泉声4-5等在改进的模型基础上，引入分数阶微积分理论，建立了软岩非线性蠕变模型，该模型具有较高的拟合效果；李晓照6等通过研究岩石蠕变裂纹与应变的关系，
