粘塑性 Cosserat 周流体力学与土工材料蠕变破坏模拟

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2024-10-22 DOI:10.1016/j.compgeo.2024.106831

Xianyang Guo, Ji Wan, Xihua Chu

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引用次数: 0

摘要

本研究在 Cosserat 周流体力学框架内，引入了粘塑性 Perzyna 模型和修正的 Drucker-Prager 准则来研究土工材料的蠕变破坏。设计了软岩的双轴压缩蠕变和带有预制缺陷的砂岩的单轴蠕变来验证所提出的模型。研究了横向压力、内摩擦角和内聚力对蠕变破坏的影响。结果表明，成功地预测了蠕变的三个阶段和相应的破坏模式，这与数值和实验结果的观测结果一致。较大的侧压力会增加土工材料的蠕变难度。内摩擦角或内聚力较大的土工材料抗剪能力较强，塑性变形较小，不易发生蠕变破坏。此外，Cosserat 内长 lc 会影响剪切带的倾角。

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A viscoplastic Cosserat peridynamics and the simulation of creep failure of geomaterials

In this study, within the framework of Cosserat peridynamics, the viscoplastic Perzyna’s model and the modified Drucker-Prager criterion are introduced to investigate the creep failure of geomaterials. The biaxial compressive creep for soft rock and the uniaxial creep for sandstone with a prefabricated flaw are designed to verify the proposed model. The effects of lateral pressure, internal friction angle, and cohesion on creep failure are investigated. Results show that the three stages of creep and the corresponding damage patterns are successfully predicted, which accords with the observations of numerical and experimental results. The larger lateral pressure makes it harder for geomaterials to creep. Geomaterials with a larger internal friction angle or cohesion have stronger shear resistance and less plastic deformation, making them less susceptible to creep failure. Besides, the Cosserat internal length l_c affects the inclination angles of the shear band.

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.