Numerical investigation on quasi-dynamic behaviours of fractured rocks under uniaxial compression using new rate-dependent contact models

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Analysis with Boundary Elements Pub Date : 2025-04-24 DOI:10.1016/j.enganabound.2025.106268

Liwang Liu , Haibo Li , Mingyang Wang , Guokai Zhang , Yaguang Sui , Xiaofeng Li

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引用次数: 0

Abstract

The behaviour of fractured rocks under quasi-dynamic loads significantly influences the stability of rock engineering projects under dynamic disturbances. To account for strain rate effects, new rate-dependent contact models were proposed in this study. Then, numerical models of fractured rocks were generated for quasi-dynamic simulations under uniaxial compression, aiming to investigate the impacts of strain rate and fracture intensity. The results show that the contact models can effectively replicate the rate-dependent behaviours of uniaxial compressive strength (UCS), and an increasing strain rate would induce a rise in UCS of fractured rocks. Additionally, the number of microcracks initiated in rock matrix and fractures show increasing trends, resulting in the higher number of failure planes and more complex failure patterns as the strain rate increases. In contrast, UCS is negatively correlated with fracture intensity, and the intensity's increase enhances the complexity of failure patterns. Regarding microcracking behaviours, the number of microcracks in rock matrix decreases with increasing intensity, while the number of microcracks within fractures increases. Since the mechanical properties of rock matrix are stronger than those of fractures and the initiation of microcracks requires externally input energy, the variations of microcracking behaviours might be intrinsic mechanisms underlying the changes in UCS.

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基于新的速率相关接触模型的单轴压缩裂隙岩石准动态特性数值研究

裂隙岩体在准动荷载作用下的行为对岩石工程在动力扰动作用下的稳定性有重要影响。为了考虑应变率效应，本研究提出了新的速率相关接触模型。然后，建立裂隙岩石的数值模型，进行单轴压缩下的准动态模拟，研究应变速率和破裂强度对裂隙岩石的影响。结果表明，接触模型能有效地模拟单轴抗压强度随应变速率的变化规律，且应变速率的增大会导致裂隙岩石单轴抗压强度的升高。此外，随着应变速率的增加，岩石基质和裂隙中产生的微裂纹数量呈增加趋势，导致破坏面数量增多，破坏模式更加复杂。相比之下，UCS与断裂强度呈负相关，强度的增加增加了破坏模式的复杂性。在微裂纹行为方面，随着强度的增加，岩石基体中的微裂纹数量减少，而裂缝内的微裂纹数量增加。由于岩石基质的力学性能比裂缝的力学性能强，而微裂纹的形成需要外部输入能量，因此微裂纹行为的变化可能是单抗强度变化的内在机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.