A novel hybrid SPH-DEM approach for simulating rockburst behavior in tunnel excavation

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Chengzhi Xia , Zhenming Shi , Yongzhi Zhao , Shaoqiang Meng , Lin Zhou , Liu Liu , Baoguo Yin
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Abstract

A hybrid smoothed particle hydrodynamics-discrete element method (SPH-DEM) is proposed to simulate rockburst behavior during deep tunnel excavation. Within this coupled code, the rock mass continuity stress and elastic deformation are computed by solving partial differential equations (PDEs) via the SPH method. Rock cracking is realized by the transition of SPH particles to DEM particles while considering rock damage. The noncontinuous deformation region is subsequently simulated via a DEM-based method. The contact pairs are established via a link-list algorithm, which enables point-to-point contact to simulate postfracture spalling. Additionally, the dormant particle approach is introduced within the continuous domain represented by SPH to simulate the excavation process, while the confining pressure application method is employed to maintain tunnel boundary stability. The coupling code accuracy and feasibility were demonstrated through three benchmark tests and three typical tunnel case studies. The results indicate that this hybrid method demonstrates clear physical significance, high robustness, and relatively less computational time consumption than standalone DEM code does, making it suitable for addressing practical tunnel-scale issues. In contrast to continuous methods, the proposed approach authentically simulates crack propagation and spalling without necessitating grid reconfiguration. Unlike discontinuous methods, the hybrid method handles the material as a continuous medium before fracturing, allowing for a detailed depiction of the stress and strain before and after failure.
一种模拟隧道开挖岩爆行为的SPH-DEM混合方法
提出了一种光滑颗粒水动力-离散元混合方法(SPH-DEM)来模拟深埋隧道开挖过程中的岩爆行为。在该耦合程序中,通过SPH法求解偏微分方程,计算了岩体的连续应力和弹性变形。在考虑岩石损伤的情况下,通过SPH粒子向DEM粒子的过渡实现岩石的开裂。随后,通过基于dem的方法对非连续变形区域进行了模拟。通过链表算法建立接触对,实现点对点接触,模拟压裂后的剥落。在以SPH为代表的连续区域内引入休眠粒子法模拟开挖过程,同时采用围压法保持隧道边界稳定。通过三个基准测试和三个典型隧道实例验证了耦合程序的准确性和可行性。结果表明,这种混合方法具有明显的物理意义,鲁棒性高,计算时间比单独的DEM代码相对较少,适合解决实际的隧道规模问题。与连续方法相比,该方法真实地模拟了裂纹扩展和剥落,而无需重新配置网格。与不连续方法不同,混合方法在压裂前将材料作为连续介质处理,从而可以详细描述破裂前后的应力和应变。
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来源期刊
Tunnelling and Underground Space Technology
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.
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