学术论文

      PFC2D模拟裂隙岩石裂纹扩展特征的研究现状

      RESEARCH PROGRESS ON PFC2D SIMULATION OF CRACK PROPAGATION CHARACTERISTICS OF CRACKED ROCK

      摘要:
      二维颗粒流数值模拟(PFC2D)是目前研究裂隙岩石裂纹扩展特征的重要手段.在大量已有相关研究文献的基础上做了以下分析和总结:从颗粒接触本构模型、细观参数的标定和裂隙模拟方法3个方面对当前PFC2D的主要模拟方法进行了总结;根据PFC2D模拟裂隙岩石裂纹扩展特征的研究现状,重点对单裂隙、断续双裂隙岩石在不同加载方式下的裂纹扩展特征进行了深入总结.在此基础上,指出当前研究中存在如下不足:裂隙岩石的PFC2D模型未考虑断裂韧度是否符合实际、平行黏结模型模拟结果与室内试验结果存在差异、模拟裂隙与真实裂隙存在差异.结合研究中存在的不足,提出了相应的解决办法并进行展望,以期有助于裂隙岩石PFC2D模拟方法的发展.
      Abstract:
      Two dimensional numerical particle flow code (PFC2D) is an important method to study the crack propagation characteristics of cracked rock.In review of related literatures,it is analyzed and summarized as follows:the current PFC2D simulation methods are summarized in three aspects of particle contact constitutive model,microparameters calibration and simulation method of crack.According to the current research,the PFC2D simulation of crack propagation characteristics is summarized focusing on the single cracked,intermittent double cracked rock under different loading methods.On this basis,the shortcomings of the current research are pointed out as follows.The fracture toughness of PFC2D model is not in line with the actual value of rock.Simulation results of parallel-bond model and test results of rock are different.There are differences between real crack and simulation crack.Combined with the existing shortcomings in the study,the corresponding solutions are put forward and are expected to contribute to the development of PFC2D simulation methods for cracked rocks.
      作者: 陈鹏宇
      Author: CHEN Pengyu
      作者单位: 内江师范学院地理与资源科学学院 内江641100
      刊 名: 工程地质学报 ISTICPKU
      年,卷(期): 2018, 26(2)
      分类号: TU45
      在线出版日期: 2018年7月11日
      基金项目: 国家自然科学基金项目,四川省教育厅科研项目