| 凌小康,张敬宗,钱鼎,宋义敏.基于DSCM-FEM的花岗岩力学参数反演方法研究[J].计算力学学报,2022,39(2):216~221 |
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| 基于DSCM-FEM的花岗岩力学参数反演方法研究 |
| Inversion optimization of granite mechanical parameters study based on DSCM-FEM |
| 投稿时间：2020-10-04 修订日期：2020-12-22 |
| DOI：10.7511/jslx20201004001 |
| 中文关键词: 数字散斑相关方法 有限单元法 力学参数 目标函数 智能算法 位移场 |
| 英文关键词:digital speckle correlation method Finite Element Method mechanical parameter objective function intelligent algorithm displacement field |
| 基金项目:国家自然科学基金(51774015)资助项目. |
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| 中文摘要: |
| 开展了基于数字散斑相关方法和有限单元法(DSCM-FEM)的花岗岩力学参数反演方法研究。选取一种花岗岩进行三点弯曲实验,以数字散斑相关方法作为实验观测手段,分析得到的试件加载过程中表面位移场作为测量值,通过有限元法得到的位移场作为仿真值,以测量值与仿真值之间的误差作为目标函数,构建反问题模型,利用优化算法对岩石的弹性模量和泊松比进行反求,获得能表征岩石力学参数的最优值。研究表明,基于水平位移的目标函数具有更高的反演精度和更快的反演速度;基于DSCM-FEM的力学参数反演方法对在较大搜索范围内的待反演力学参数具有较强的识别能力,能一次性地反演出岩石的力学参数。 |
| 英文摘要: |
| Research on the inversion method of mechanical parameters of granite based on Digital speckle correlation Method and Finite Element Method (DSCM-FEM).A kind of granite was selected for three-point bending experiment.Digital speckle correlation method is used as an experimental observation tool.The surface displacement field obtained from the analysis during the loading of the specimen is used as the measured value,and the displacement field obtained by the Finite Element Method is used as the simulated value.In the inverse problem model,the objective function is the error between the measured and simulated values.An optimisation algorithm is used to solve for the Young’s modulus and Poisson’s ratio of the rock.The results show that the objective function based on horizontal displacement has higher identification accuracy and a higher speed;The inversion method of mechanical parameters proposed in this paper has a strong identification ability to identify the mechanical parameters at large intervals,and can determine the mechanical parameters of rocks at once. |
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