摘要
【目的和方法】巷道围岩时效变形破坏、蠕变型冲击地压等灾害是深井面临的重大威胁,加之深部采动与结构变化的影响,亟需研究强扰煤岩体蠕变过程中跨尺度非连续结构演化规律,系统回顾煤岩体力学性质的尺度效应、非连续结构与多物理场效应,以及煤岩体长时稳定性、蠕变演化规律与力学模型。【结果和结论】强调不同尺度(细观-宏观-工程尺度)、不同尺寸(REV范围内)煤岩变形破裂过程中非连续结构(包括裂隙和矿物)与物理力学性质存在密切的关联特征。指出煤岩体跨尺度非连续结构导致应力场非均匀分布,造成力学各向异性、尺度效应及尺寸效应,进而出现非协调宏观破裂现象。透明解析与推演煤岩变形破裂过程中跨尺度非连续结构与多物理场演化规律,是认识煤岩灾变内禀机制的关键。明确指出现有蠕变实验与蠕变模型在煤岩表面变形及破裂方面具有优势,但无法预测煤岩内部变形与非连续结构;为此提出了全尺寸CT扫描重构、数字体图像相关(DVC)、跨尺度等效岩体-等效晶质建模(SRM-GBM)相结合的破解方法。对扰动煤岩体蠕变前沿问题进行了讨论,阐明了非连续结构与应力引起内部变形损伤诱发蠕变这一新观点,指出非连续结构和应力是煤岩非协调蠕变的主控因素,最后建立了强扰煤岩体蠕变过程中跨尺度非连续结构与多物理场演化的精细化建模及透明解析新方法。研究成果为相关矿山灾害的发生机理、预警与防控提供理论基础。
[Objective and Methods]Disasters associated with surrounding rocks in roadways,such as time-dependent deformation failure and creep-induced rock bursts,severely threaten deep mines in China.These disasters,coupled with the impacts of deep mining and structural changes,render it urgent to explore the evolutionary patterns of trans-scale dis-continuous structures during the creeps of strongly disturbed coals.This study systematically reviews the scale effects of coals'mechanical properties,the discontinuous structures and multi-physics field effects of coals,and the long-term sta-bility,creep evolutionary patterns,and mechanical models of coals.It highlights the close correlation between discon-tinuous structures(including their fractures and minerals)and physical and mechanical properties during the deforma-tion and failure of different scales(mesoscopic,macroscopic,and engineering scales)and sizes(within the range of rep-resentative elementary volume(REV))of coals.[Results and Conclusions]The results indicate that the trans-scale dis-continuous structures of coals cause the nonuniformly distributed stress field,which results in mechanical anisotropy,scale effects,and size effects.Consequently,disharmonic macroscopic rupture will occur.The key to understanding the intrinsic disaster mechanisms of coals is the transparentized analysis and deduction of the evolutionary patterns of both trans-scale discontinuous structures and the multi-physics field during the deformation and rupture of coals.It is clear that existing creep experiments and models enjoy advantages in revealing the surface deformations and failure of coals.However,they fail to predict the deformations and discontinuous structures within coals.Hence,the authors of this study developed an approach that combines full-size computed tomography(CT)scanning and digital reconstruction,digital volume correlation(DVC),and trans-scale synthetic rock mass and grain-based modeling(SRM-GBM).This study ex-plores the leading-edge issues related to the creeps of disturbed coals,introducing the new point of view that the creeps of coals are induced by internal deformation and damage caused by their discontinuous structures and stress.Accord-ingly,it proposes that discontinuous structures and stress serve as the dominant factors governing the disharmonic creeps of coals.Finally,this study developed new methods for fine-scale modeling and transparentized analysis for exploring the evolution of both trans-scale discontinuous structures and the multi-physics field during the creeps of strongly dis-turbed coals.The results of this study will lay the theoretical foundation for the occurrence mechanisms,early warning,and prevention and control of relevant mine disasters.
作者
张良
王来贵
REN Ting
李祥春
高科
李海涛
赵善坤
ZHANG Liang;WANG Laigui;REN Ting;LI Xiangchun;GAO Ke;LI Haitao;ZHAO Shankun(Deep Mining and Rockburst Research Institute,CCTEG Chinese Institute of Coal Science,Beijing 100013,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Jiaozuo 454003,China;State Key Laboratory of Intelligent Coal Mining and Strata Control,Beijing 100013,China;School of Mechanics&Engineering,Liaoning Technical University,Fuxin 123000,China;School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong,NSW 2522,Australia;School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Safety Science and Engineering College,Liaoning Technical University,Huludao 125105,China;CCTEG China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Beijing 100013,China)
出处
《煤田地质与勘探》
EI
CAS
CSCD
北大核心
2024年第10期47-59,共13页
Coal Geology & Exploration
基金
国家自然科学基金项目(52304222,U23B2093,52274245)
河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放基金项目(WS2022B02)。
关键词
强扰煤岩体
蠕变本质
跨尺度非连续结构
内部应变场
损伤演化
透明解析
CT扫描与数字重构
精细化建模
strongly disturbed coal
creep essence
trans-scale discontinuous structure
internal strain field
damage evol-ution
transparentized analysis
computed tomography(CT)scanning and digital reconstruction
fine-scale modeling
作者简介
第一作者:张良,1991年生,男,湖北麻城人,博士,副研究员。E-mail:zhangliang9106@hotmail.com。
