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Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress

高地应力岩体动态数值模拟中的应力初始化方法研究

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Abstract

In the context of deep rock engineering, the in-situ stress state is of major importance as it plays an important role in rock dynamic response behavior. Thus, stress initialization becomes crucial and is the first step for the dynamic response simulation of rock mass in a high in-situ stress field. In this paper, stress initialization methods, including their principles and operating procedures for reproducing steady in-situ stress state in LS-DYNA, are first introduced. Then the most popular four methods, i.e., explicit dynamic relaxation (DR) method, implicit-explicit sequence method, Dynain file method and quasi-static method, are exemplified through a case analysis by using the RHT and plastic hardening rock material models to simulate rock blasting under in-situ stress condition. Based on the simulations, it is concluded that the stress initialization results obtained by implicit-explicit sequence method and dynain file method are closely related to the rock material model, and the explicit DR method has an obvious advantage in solution time when compared to other methods. Besides that, it is recommended to adopt two separate analyses for the whole numerical simulation of rock mass under the combined action of in-situ stress and dynamic disturbance.

摘要

在深部岩体工程中, 岩体在动态扰动作用下的响应行为与其自身的原位地应力状态密切相关, 因此, 岩体应力初始化作为高地应力岩体动态响应数值模拟的第一步, 其作用至关重要. 首先, 介绍了基于 LS-DYNA 的应力初始化方法, 包括模拟中再现稳定原位应力状态的基本原理及其相应的操作步骤. 其后, 通过实例分析, 以 RHT 和塑性硬化岩石材料模型为基础, 采用四种常用的应力初始化方法 (即显式动态松弛法、隐-显式序列法、 Dynain 文件法和准静态方法) 模拟高地应力条件下的岩体爆破响应. 通过模拟对比得出, 以隐-显式序列法和 Dynain 文件法获得的应力初始化结果与所选用的岩石材料模型密切相关, 而在求解时间方面, 显式动态松弛法较其他方法具有明显优势. 此外, 在原位应力和动态扰动共同作用下的岩体响应模拟过程中, 为便于实际操作, 建议采取两步骤相继独立分析 (地应力分析和动态分析) 的方式开展数值模拟工作.

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Jia-cai Yang  (杨家彩), Ke-wei Liu  (刘科伟), Xu-dong Li  (**旭东) & Zhi-xiang Liu  (刘志祥)

  2. School of Civil and Resource Engineering, The University of Western Australia, Perth, Australia

    Ke-wei Liu  (刘科伟)

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  1. Jia-cai Yang  (杨家彩)
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  3. Xu-dong Li  (**旭东)
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Contributions

The overarching research goals were developed by LIU Ke-wei, YANG Jia-cai and LIU Zhi-xiang. LI Xu-dong and YANG Jia-cai analyzed the calculated results. The initial draft of the manuscript was written by YANG Jia-cai. All authors replied to reviewers’ comments and revised the final version.

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Correspondence to Ke-wei Liu  (刘科伟).

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YANG Jia-cai, LIU Ke-wei, LI Xu-dong and LIU Zhi-xiang declare that they have no conflict of interest.

Foundation item: Project(41630642) supported by the Key Project of National Natural Science Foundation of China; Project(51974360) supported by the National Natural Science Foundation of China; Project(2018JJ3656) supported by the Natural Science Foundation of Hunan Province, China

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Yang, Jc., Liu, Kw., Li, Xd. et al. Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress. J. Cent. South Univ. Technol. 27, 3149–3162 (2020). https://doi.org/10.1007/s11771-020-4535-3

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