College of Civil Engineering,Sichuan University of Science & Engineering
National and Local Joint Engineering Research Center of Shale Gas Exploration and Development,Chongqing Institute of Geology and Mineral Resources
Engineering Laboratory for Safe and Precise Coal Mining of Anhui Province,Anhui University of Science and Technology

为探究矿物非均质性对充填裂隙煤岩变形局部化及微裂纹扩展演化规律的影响,构建基于矿物组分离散元细观数值模型,从细观尺度上揭示试验过程中产生的宏观变形破裂,并基于测量圆方法对裂隙煤岩应力场及裂纹周围位移矢量场的局部化特征进行反演分析。研究结果表明,同一裂隙倾角下,随着岩桥角度增大,裂隙煤岩峰值强度呈先降低后增高的趋势,对应的裂纹贯通模式由近似平行于轴向张拉混合破坏的间接贯通向斜剪拉伸破坏的直接贯通转变,微观拉伸和剪切裂纹的萌生应力水平与裂隙倾角成正相关,压剪裂纹萌生起裂时间较拉伸裂纹和拉-剪混合裂纹晚。另外,含充填裂隙煤岩周围的压缩局部化区域较非充填工况大,相反,拉伸局部化区域变小。

In order to explore the influence of mineral heterogeneity on the deformation localization and microcrack propagation of fractured coal-rock,the macroscopic deformation and fracturing process of fractured coal-rock during the testing were revealed from the microscopic scale based on the constructed discrete element numerical model considering mineral components. The localization characteristics of the stress field and the displacement vector field around the crack were analyzed using the measurement circle method. The research results show that under the same flaw inclination angle,the peak strength of fractured coal - rock first decreases and then increases with the increase of ligament angle. The penetration mode of fractured coal-rock changes from indirect penetration approximately parallel to axial tensile mixed failure to direct penetration of oblique shear-tensile failure. The initiation stress levels of meso-tensile and shear cracks are positively correlated with the flaw inclination angle. The initiation of compressive shear crack is later than those of tensile crack and tensile-shear crack. In addition,the compression localization area around the infilled flaws is larger than that of the non-infilled one,while the tensile localization area tends to be smaller.

四川省自然科学基金项目(2022NSFSC1033);重庆市博士后研究项目特别资助项目(2022CQBSHTB3109);安徽省煤炭安全精准开采工程实验室开放基金项目(ESCMP202305)

雷瑞德,邹旭,胡超,等.充填裂隙煤岩变形局部化及微裂纹扩展过程研究[J].矿业安全与环保,2025,52(1):150-159.

LEI Ruide,ZOU Xu,HU Chao,et al. Study on deformation localization and micro-cracking process of infilled fractured coal-rock[J]. Mining Safety & Environmental Protection,2025,52(1):150-159.