Experimental study on the crack propagation characteristics of drilled-slit and grouted rock samples based on CT three-dimensional scanning

IF 7.8 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-09-05 DOI:10.1016/j.psep.2025.107808

Jianhua Fu , Xuelong Li , Hengjie Qin , Shuailin Wang , Shumin Liu , Zhiming Wang , Zeqi Wu , Zhen Lou

{"title":"Experimental study on the crack propagation characteristics of drilled-slit and grouted rock samples based on CT three-dimensional scanning","authors":"Jianhua Fu , Xuelong Li , Hengjie Qin , Shuailin Wang , Shumin Liu , Zhiming Wang , Zeqi Wu , Zhen Lou","doi":"10.1016/j.psep.2025.107808","DOIUrl":null,"url":null,"abstract":"<div><div>Gas leakage in cross-layer drainage boreholes compromises methane extraction efficiency through reduced concentration and recovery rates, while increasing residual gas content and coal outburst risks. This phenomenon further exacerbates operational hazards, including excessive gas emissions during mining activities and potential coal-gas outburst incidents. To address sealing challenges in deep coal seams, this study conducts an inquiry into the effectiveness of slit-grouting technology through triaxial compression tests and industrial CT scanning. The experimental protocol examines strength variations and fracture propagation patterns in rock specimens under different slit configurations. Key findings indicate that increased slit quantity enhances fracture network complexity while improving grout distribution uniformity. However, it simultaneously reduces specimen strength (by 3.3–12.1 %) and permeability (by 0.66–18.94 % compared to the unslitted grouted sample, G0). Post-failure analysis demonstrates linear correlations between slit quantity and three-dimensional fracture parameters: fracture volume (by 2.52–40.12 %) and fractal dimension (+0.0849 units per slit) increase proportionally, while Euler number decreases correspondingly (R²=0.84). Pore network analysis indicates enhanced topological connectivity with additional slits. Optimization studies identify single-slit configuration as optimal, balancing structural integrity with effective sealing performance. These findings establish a scientific foundation for advanced sealing technologies, offering dual benefits in outburst prevention and methane emission control - indispensable for sustainable mining operations and greenhouse gas mitigation.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"202 ","pages":"Article 107808"},"PeriodicalIF":7.8000,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Process Safety and Environmental Protection","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0957582025010754","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Gas leakage in cross-layer drainage boreholes compromises methane extraction efficiency through reduced concentration and recovery rates, while increasing residual gas content and coal outburst risks. This phenomenon further exacerbates operational hazards, including excessive gas emissions during mining activities and potential coal-gas outburst incidents. To address sealing challenges in deep coal seams, this study conducts an inquiry into the effectiveness of slit-grouting technology through triaxial compression tests and industrial CT scanning. The experimental protocol examines strength variations and fracture propagation patterns in rock specimens under different slit configurations. Key findings indicate that increased slit quantity enhances fracture network complexity while improving grout distribution uniformity. However, it simultaneously reduces specimen strength (by 3.3–12.1 %) and permeability (by 0.66–18.94 % compared to the unslitted grouted sample, G0). Post-failure analysis demonstrates linear correlations between slit quantity and three-dimensional fracture parameters: fracture volume (by 2.52–40.12 %) and fractal dimension (+0.0849 units per slit) increase proportionally, while Euler number decreases correspondingly (R²=0.84). Pore network analysis indicates enhanced topological connectivity with additional slits. Optimization studies identify single-slit configuration as optimal, balancing structural integrity with effective sealing performance. These findings establish a scientific foundation for advanced sealing technologies, offering dual benefits in outburst prevention and methane emission control - indispensable for sustainable mining operations and greenhouse gas mitigation.

查看原文本刊更多论文

基于CT三维扫描的钻缝和注浆岩石试样裂纹扩展特性试验研究

跨层抽采钻孔瓦斯泄漏降低了瓦斯浓度和回采率，影响了瓦斯抽采效率，同时增加了残余瓦斯含量和突出危险性。这种现象进一步加剧了作业危害，包括开采过程中过量的瓦斯排放和潜在的煤-瓦斯突出事件。为了解决深部煤层的密封难题，本研究通过三轴压缩试验和工业CT扫描对裂隙注浆技术的有效性进行了探讨。实验方案考察了岩石试样在不同狭缝配置下的强度变化和断裂扩展模式。研究结果表明，裂缝数量的增加增加了裂缝网络的复杂性，同时改善了浆液分布的均匀性。然而，它同时降低了试样的强度（3.3-12.1 %）和渗透性（0.66-18.94 %），与未分缝灌浆试样相比，G0)。裂隙数量与三维裂缝参数呈线性相关，裂缝体积（增加2.52 ~ 40.12 %）和分形维数（每裂隙+0.0849个单位）成比例增大，欧拉数相应减小（R²=0.84）。孔隙网络分析表明，额外的狭缝增强了拓扑连通性。优化研究确定单缝配置是最佳的，可以平衡结构完整性和有效的密封性能。这些发现为先进的密封技术奠定了科学基础，在防止突出和控制甲烷排放方面具有双重效益，这是可持续采矿作业和温室气体减排不可或缺的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.