文献类型：期刊文献

英文题名：Evolution of the anchored load-bearing structural mechanism in fragmented rock masses based on discrete element method (DEM) analysis

作者：Zeng, Zilong Wang, Ping Zhu, Yongjian Zhou, Ze Wang, Xizhi Wei, Mingxing

第一作者：Zeng, Zilong

通信作者：Zeng, ZL[1]

机构：[1]Hunan Univ Sci & Technol, Coll Resources Environm & Safety Engn, 2 Taoyuan Rd, Xiangtan 411201, Peoples R China;[2]Guizhou Inst Technol, Sch Min Engn, Guiyang 550001, Peoples R China

第一机构：Hunan Univ Sci & Technol, Coll Resources Environm & Safety Engn, 2 Taoyuan Rd, Xiangtan 411201, Peoples R China

通信机构：corresponding author), Hunan Univ Sci & Technol, Coll Resources Environm & Safety Engn, 2 Taoyuan Rd, Xiangtan 411201, Peoples R China.

年份：2026

卷号：205

外文期刊名：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001793328600001)】；

基金：This research was funded by the National Natural Science Foundation of China (No.52174110, and No.5227411)

语种：英文

外文关键词：Fractured surrounding rock; Anchorage mechanism; Self-organization; Friction effect; Load-bearing structure; Anchorage density; Energy dissipation

摘要：To address the limited understanding of anchorage mechanisms in large-scale fragmented surrounding rock, this study introduces the anchorage density parameter delta = D/S and uses the DEM to investigate the self-organized reconfiguration of a gangue system under different anchorage densities. The results show that, in the absence of an anchor, gravitational disturbance coupled with boundary constraint gives rise to spatially differentiated displacement responses, leading to the formation of a loosening zone, a balance zone, a shear-compression band, and a loading zone. Within the shear-compression band, blocks deflect towards the central axis and generate a horizontal thrust T, which, together with the self-weight Q of the overlying gangue in the loading zone, provides the fundamental mechanical basis for self-organized arching. Under the same pretension condition, increasing delta enhances the initial continuity of internal force chains, promotes earlier coalescence of the composite arch, and progressively drives the system towards an "arch-band-beam" load-bearing skeleton with more pronounced friction-dominated dissipation. Furthermore, under idealized conditions, equilibrium equations and geometric constraint relationships are established, from which a characteristic arch-height equation is derived to interpret the evolutionary trend in the stability of the load-bearing structure.