College of Energy and Mining Engineering,Shandong University of Science and Technology

为研究侧限条件下不同轴向荷载、饱水状态及粒径级配3种因素对断层破碎岩体的压缩变形及分形特征的影响,以山东星村煤矿非导水断层取出的断层岩石为试样,利用自主研制的破碎岩石变形—渗流试验系统,开展侧限条件下不同Talbol幂指数n的级配破碎岩石压缩变形试验。研究结果表明:随着轴向载荷逐级增大,破碎岩石轴向位移量增大,压缩碎胀系数和压实度变小;相同侧限轴向荷载条件下,饱水状态试样的轴向位移量和加载终点位移累积变形量比干燥状态的更大;随着级配指数增大,加载终点位移累积变形量变大;破碎岩石的质量分布系数C随Talbol幂指数n增大而增大,且随轴向荷载的增大而减小;破碎岩石分形维数D随Talbol幂指数n增大而减小,试验后分形维数增量随Talbol幂指数n增大而增大,即岩石破碎程度愈加剧烈。根据破碎岩体力学特征与分形特征将其变形过程划分为松散堆积、错位挤压、变形开裂、研磨破碎4个阶段,在加载前期岩石变形以颗粒滑动位移为主,加载后期变形以颗粒研磨破碎为主。

To investigate the effects of axial loads, saturation levels, and particle size gradation on the compressive deformation and fractal characteristics of fault-fractured rock under confined conditions,this study utilized rock samples from a non- water - conducting fault in the Xingcun Coal Mine in Shandong. These samples were tested using a self - developed deformation- seepage experimental system for fractured rocks, focusing on compression tests of graded fractured rocks with different Talbol power index ( n) values under confined conditions. The research results indicate that as axial loads increase incrementally,the axial displacement of fractured rocks increases,while the compression expansion coefficient and compaction degree decrease. Under identical confined axial load conditions, saturated samples exhibit greater axial displacement and cumulative deformation at the loading endpoint compared to dry samples. Additionally,an increase in the gradation index leads to larger cumulative deformation at the loading endpoint. The mass distribution coefficient C increases with the Talbol exponent n but decreases with increasing axial loads. The fractal dimension D of fractured rocks decreases as the Talbol exponent n increases,while the post-test fractal dimension increment also increases with n,indicating more severe rock fragmentation. Based on the mechanical and fractal characteristics of fractured rocks,their deformation process can be categorized into four stages: loose accumulation,dislocation compression,deformation cracking,and grinding fragmentation. During the early loading phase, deformation is primarily characterized by particle sliding,whereas in the later loading phase,it is dominated by particle grinding and fragmentation.

国家自然科学基金面上项目(52274131);泰山学者工程专项经费资助项目(tsqn202211152);煤炭资源高效开采与洁净利用国家重点实验室开放基金项目(2021-CMCU-KF017)

孙文斌,田殿金,薛彦超,等.基于Talbol理论的破碎岩石压缩变形及分形特征试验研究[J].矿业安全与环保,2025,52(1):61-69.

SUN Wenbin,TIAN Dianjin,XUE Yanchao,et al. Experimental study on compressive deformation and fractal characteristics of fractured rock based on Talbol theory [ J]. Mining Safety & Environmental Protection,2025,52(1):61-69.