Geotechnical Strain Localization Analysis Based on Micropolar Continuum Theory Considering Evolution of Internal Characteristic Length
Publication: International Journal of Geomechanics
Volume 22, Issue 8
Abstract
Within the framework of second-order cone programming optimized micropolar continuum finite-element method (CosFEM-SOCP), the geotechnical strain localization can be adequately modeled. In most existing literatures, however, the constant internal characteristic length lc has been adopted and less attention has been paid to the evolution of lc. To more accurately predict the strain localization, response, and stability of a geotechnical system, one relationship for evolving lv that relies on the equivalent plastic strain is implemented and investigated. Based on one homogeneous slope example and one rigid strip footing example, it was found that geotechnical stability may not be significantly affected by evolving lv, indicating that constant lc can be simply applied to geotechnical stability analysis. For the rigid strip footing problem, nevertheless, the effects of evolving lv on the pressure–displacement response curves should not be ignored, and the influence range of the shear band predicted by CosFEM-SOCP with evolving lv is generally smaller than that predicted by CosFEM-SOCP with constant lc. Consequently, in order to more accurately predict the pressure–displacement response curves and the failure zone, the evolving lv will be adequately assessed and modeled.
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Acknowledgments
This study is supported by the National Natural Science Foundation of China (No. 52178309), the National Key R&D Program of China (No. 2017YFC0804602), the scientific research foundation for the National Basic Research Program of China (No. 2012CB026104), and the Fundamental Research Funds for the Central Universities (No. 2019JBM092).
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Published In
International Journal of Geomechanics
Volume 22 • Issue 8 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 20, 2021
Accepted: Mar 8, 2022
Published online: Jun 1, 2022
Published in print: Aug 1, 2022
Discussion open until: Nov 1, 2022
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