基于微震反演裂隙的采动岩体损伤分析方法及其工程应用  

Damage analysis method for mining rock mass based on microseismic-derived fractures and its engineering application

作　　者：赵永[1,2] 杨天鸿[1,2] 王述红[2] 贾蓬[2] ZHAO Yong;YANG Tian-hong;WANG Shu-hong;JIA Peng(Center for Rock Instability and Seismicity Research,Northeastern University,Shenyang 110819,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学岩石破裂与失稳研究所,辽宁沈阳110819 [2]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《岩土工程学报》2022年第2期305-314,I0005,I0006,I0007,共13页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2017YFC1503101);国家自然科学基金项目(52004052,U1903216);博士后国际交流派出计划项目(2020059);中央高校基本科研业务专项项目(N2101027)。

摘　　要：采动条件下岩体发生渐进损伤诱使裂隙萌生、发展和贯通,继而形成导水通道诱发突水灾害。该过程涉及裂隙演化及岩石损伤等问题,使得突水灾害具有动态复杂性的特点。显然,从理论上准确解译突水通道及其演化规律是十分困难的,需要依靠现场监测和数值模拟手段。为此,从"岩体变形破裂过程中,微震现象的主要本质是裂隙的扩展"学术观点出发,建立了基于微震反演裂隙的各向异性损伤模型,并将该模型与FLAC^(3D)数值模拟分析相结合,期望将岩体宏观力学行为与裂隙发展相联系。最后,将研究成果应用到张马屯铁矿注浆帷幕突水通道分析中:对帷幕失稳区损伤系数及损伤张量进行了分析;标定了突水通道;并从渗流–应力–损伤角度建立三维数值计算模型,研究了帷幕与采场之间围岩应力及屈服特性,确定了岩体采动诱发突水通道特征及其形成机理,以期为矿山安全开采和水治理设计提供帮助。The progressive damage of rock masses under mining conditions will induce the initiation,development and connection of fractures,form water inrush channels,and finally induce water inrush disasters.This disastrous process involves fracture evolution and rock damage,making the water inrush disasters dynamic and complex.It is challenging to accurately interpret the evolution law of the water inrush channels in theory,which needs to rely on the field monitoring and numerical simulation.Therefore,from the theoretical point of view that "the main essence of microseismic(MS) phenomena is the propagation of fractures",an anisotropic damage model is established based on the MS data.This model is combined with FLAC^(3D) numerical simulation analysis,which is expected to link macroscopic mechanical behavior of rock masses with fracture development.Finally,the research results are applied to the analysis of the water inrush channels of the grouting curtain in Zhangmatun Iron Mine.The damage process and the damage tensor of the instability zone are analyzed,the distribution of water inrush channels is determined,and the numerical model is established from the perspective of seepage-stress-damage.The characteristics of stress and plastic yield zone between curtain and stope are studied,and the characteristics and formation mechanism of the water inrush channels induced by mining are determined to provide help for the safe mining and water treatment design of mines.

关 键 词：矿山 微震监测 裂隙演化 渗流通道 各向异性损伤 

分 类 号：TU452[建筑科学—岩土工程] TD862.2[建筑科学—土工工程]