A new type of rockbolt model in 3D FDEM and its application to tunnel excavation

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2024-11-12 DOI:10.1016/j.tust.2024.106210

Chenglei Du , Yong Cheng , Quansheng Liu , Zitao Cheng , Yiwei Liu , You Lu , Haitao Jiang

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引用次数: 0

Abstract

Rockbolt is a common support method in underground tunnel engineering, used to enhance the strength of rock mass and improve the stability of surrounding rock. In this paper, the three-dimensional (3D) FDEM method is employed to study the influence of rockbolts on the deformation and crack evolution of surrounding rock in tunnel engineering. Firstly, the CUDA-based GPU parallel 3D FDEM algorithm is briefly described, and its calculation process is summarized. At the same time, the contact search grid partitioning algorithm is optimized to address the problem of program crashes caused by grid memory overflow. Subsequently, a new rockbolt characterization method suitable for 3D FDEM algorithm is proposed, and the calculation process and constitutive equation of the new rockbolt algorithm are described in detail. The accuracy and feasibility of the new rockbolt algorithm are successfully verified by the pull-out test model and the three-point test model. Next, the numerical simulation of TBM tunnel project is carried out to study the deformation behavior and crack evolution path of surrounding rock after tunnel excavation. The results show that the vertical displacement of surrounding rock at the top of rockbolt tunnel model is greatly reduced, the crack development process is slowed down and the number of cracks is reduced. Finally, the influence of rockbolt row spacing and length on the deformation and crack propagation of surrounding rock is discussed. It is found that as the spacing decreases or the rockbolt length increases, the number of cracks in the surrounding rock gradually decreases, and the vertical displacement at the top of the surrounding rock gradually reduces. This study is helpful to understand the influence of rockbolts on the stability of surrounding rock, especially in tunnel engineering, it is of great significance for adjusting the rockbolt scheme under adverse geological conditions.

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三维 FDEM 中的新型锚杆模型及其在隧道挖掘中的应用

锚杆是地下隧道工程中常用的一种支护方法，用于增强岩体强度和提高围岩稳定性。本文采用三维 FDEM 方法研究隧道工程中岩锚对围岩变形和裂缝演化的影响。首先，简要介绍了基于 CUDA 的 GPU 并行三维 FDEM 算法，并总结了其计算过程。同时，针对网格内存溢出导致程序崩溃的问题，优化了接触搜索网格划分算法。随后，提出了一种适用于三维 FDEM 算法的新型岩螺栓表征方法，并详细介绍了新型岩螺栓算法的计算过程和构成方程。通过拔出试验模型和三点试验模型成功验证了新岩层螺栓算法的准确性和可行性。接着，对 TBM 隧道工程进行了数值模拟，研究了隧道开挖后围岩的变形行为和裂缝演化路径。结果表明，锚杆隧道模型顶部围岩的垂直位移大大减小，裂缝发展过程减慢，裂缝数量减少。最后，讨论了岩脚排距和长度对围岩变形和裂缝扩展的影响。研究发现，随着岩钉间距的减小或岩钉长度的增加，围岩中的裂缝数量逐渐减少，围岩顶部的垂直位移也逐渐减小。该研究有助于了解锚杆对围岩稳定性的影响，特别是在隧道工程中，对于在不良地质条件下调整锚杆方案具有重要意义。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.