| 破裂全过程模拟的改进非连续变形分析方法 |
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| 引用本文： | 徐栋栋,邬爱清,李聪,汪斌,蒋昱州,曾平,杨永涛.破裂全过程模拟的改进非连续变形分析方法[J].岩土力学,2019,40(3):1169-1178. |
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| 作者姓名： | 徐栋栋 邬爱清 李聪 汪斌 蒋昱州 曾平 杨永涛 |
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| 作者单位： | 1. 长江科学院 水利部岩土力学与工程重点实验室，湖北 武汉 430010；
2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室，湖北 武汉 430071 |
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| 基金项目： | 国家自然科学基金（No.11502033, No.51579016, No.51579017, No.41672320）；长江科学院研转项目（No.CKZS2017007/YT）；长江科学院创新团队项目（No.CKSF2017066/YT）；中央级公益性科研院所基本科研业务费项目（No.CKSF2016272/YT, No.CKSF2015039/YT）。 |
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| 摘 要： | 研究工程岩体中裂纹的萌生、扩展和贯通机制以及后续沿着软弱结构面的滑动机制对于揭示岩体变形和破坏规律具有十分重要的意义。非连续变形分析（DDA）方法对于模拟由宏观结构面切割而成的离散块体系统的滑动变形具有与生俱来的优势，但在模拟岩体由连续到非连续的破坏演化过程方面存在不足。通过引入虚拟节理技术将连续区域离散为子块体，并设定虚拟节理强度为岩石本身强度的方式，在一定程度上加强了DDA对于岩体连续特性的模拟。但这种方式仅考虑虚拟节理达到抗拉强度之前的黏结作用，而忽略了岩石应力?应变全过程曲线中应变软化阶段的强度。因此，通过在子块体间插入一种能够描述岩石应变软化阶段的应变软化黏结单元的方式对上述不足进行了改进，进一步加强了DDA对于岩体连续特性的模拟，并保留了DDA在非连续变形模拟方面的优势。最后，将其应用于求解几个典型的破裂问题。结果表明，模拟的破裂路径与参考解较为一致，证实了改进DDA方法的有效性和正确性。
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| 关 键 词： | 连续?非连续变形分析 虚拟节理 节理单元 破裂路径 断裂能释放率 |
| 收稿时间： | 2017-09-22 |
An improved discontinuous deformation analysis method for simulation of whole fracturing process |
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| XU Dong-dong,WU Ai-qing,LI Cong,WANG Bin,JIANG Yu-zhou,ZENG Ping,YANG Yong-tao.An improved discontinuous deformation analysis method for simulation of whole fracturing process[J].Rock and Soil Mechanics,2019,40(3):1169-1178. |
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| Authors: | XU Dong-dong WU Ai-qing LI Cong WANG Bin JIANG Yu-zhou ZENG Ping YANG Yong-tao |
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| Institution: | 1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei 430010, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics,
Chinese Academy of Sciences, Wuhan, Hubei 430071, China |
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| Abstract: | It is of great important significance to study the mechanism of initiation, propagation and coalescence in engineering rock mass and the subsequent sliding mechanism along the weak structural plane for revealing the law of deformation and failure of rock mass. Discontinuous deformation analysis (DDA) method owns an inherent advantage in simulating the sliding deformation of discrete block system, which is formed by the intersections of various macroscopic structural planes. But it is slightly inadequate in the simulation of the evolution process from continuum to discontinuum. DDA has strengthened its ability in the simulation of continuous characteristics of rock mass to a certain extent by introducing virtual joint technology to discretize the continuous area into sub blocks and then setting strength of virtual joint as that of the rock itself. However, this treatment only considers the bonding effect of virtual joints before reaching the tensile strength and ignores the strength of the strain softening stage in the complete stress-strain curve of rock. Therefore, the above deficiencies have been improved by inserting a so-called strain softening cohesive element between the sub blocks which can describe the strain softening stage in the stress-strain curve of rock. This further strengthens the ability of DDA in the simulation of continuous attributes of materials and also retains its inherent advantages in the simulation of discontinuous deformation. Finally, it is applied to solve several typical crack problems. The results show that the simulated fracture paths are in good accordance with the reference solutions, proving the validity and correctness of the improved DDA method. |
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| Keywords: | continuous-discontinuous deformation analysis virtual joint joint element fracture path fracture energy release rate |
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