• 应用研究 •

### 岩石单轴压缩实验边界条件反演研究1)

1. *北方工业大学土木工程学院,北京 100144
†北京理工大学宇航学院,北京 100081
• 收稿日期:2020-05-22 修回日期:2020-07-13 出版日期:2020-12-20 发布日期:2020-12-20
• 通讯作者: 2) 吴佳宁,硕士研究生,主要研究方向为岩石力学、地下工程等领域。E-mail: civilwjn@163.com
• 基金资助:
1) 国家自然科学基金资助项目(51774015)。

### INVERSION OF BOUNDARY CONDITIONS FOR ROCK UNIAXIAL COMPRESSION EXPERIMENTS 1)

WU Jianing*,2), XING Tongzhen, SONG Yimin*

1. *School of Civil Engineering, North China University of Technology, Beijing 100144, China
†School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
• Received:2020-05-22 Revised:2020-07-13 Online:2020-12-20 Published:2020-12-20

Abstract: Based on the finite element method and the measured data, the uniaxial compression boundary conditions and the elastic parameters of the specimen are obtained by inversion method. Firstly, the parameter inversion equations are derived. Secondly, the surface displacement field of a red sandstone specimen is obtained by the digital speckle correlation method. Finally, based on the grid node displacement calculated by the finite element method and the measured data, the boundary conditions, the elastic modulus and the Poisson's ratio of the specimen are obtained. It is shown that: (1) by using the method developed in this paper, the boundary conditions and the elastic parameters of materials are obtained by the inversion method. (2) the elastic modulus of the specimen is about 18~GPa, and the value is gradually stabilized in the later stage of loading; the Poisson's ratio gradually increases with the loading, and the value is between 0.14 and 0.34. (3) due to the heterogeneous nature of the rock material, a certain difference is observed in the direction and the magnitude of the external load of adjacent nodes in the horizontal direction.