Comparative study on shear stress distribution characteristics of tension-dispersed anchors in rock support

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0035

Abstract

Abstract:

To reveal the distribution characteristics of interfacial shear stress in the anchor units of tension-dispersed anchors, the Kelvin displacement solution and the three-dimensional explicit finite difference method were employed to investigate the shear stress distribution in tension-dispersed anchor support. A numerical model of a single-borehole tension-dispersed anchor with three anchor units was established to analyze the distribution patterns of shear stress superposition effects under different load conditions. The reliability of the results was verified through elastic and numerical solutions. The results indicate that under tensile load, the interfacial shear stress of the anchor units in a tension-dispersed anchor exhibits a segmented pattern resembling ″high peaks flanking valleys,″ with consistent trends between the elastic and numerical solutions; after the superposition of shear stress concentrations in the anchor units, the axial distribution shows significant heterogeneity, influenced by the arrangement of the anchor units and the rock mass parameters; the magnitude of prestress in the anchor units, the ratio of elastic moduli between the surrounding rock and the anchor, and the length of the anchor units significantly affect the peak shear stress and its location.

Key words: pre-stress, anchor unit, tension-dispersed type, numerical simulation, shear stress distribution

CLC Number:

X936

SUN Wei, MENG Shuchi, DING Yonghong, SHI Anzhong. Comparative study on shear stress distribution characteristics of tension-dispersed anchors in rock support[J]. China Safety Science Journal, 2025, 35(S2): 103-109.

Figures/Tables 15

Fig.1

Fig.2

Fig.3

Table 1

Table 2

Fig.4

Fig.5

Table 3

Fig.6

Fig.7

Fig.8

Fig.9

Table 4

Fig.10

Fig.11

References 12

[1]	BARLEY A D. Theory and practice of the single bore multiple anchor system[C]. Proceedings of International Symposium on Anchors in Theory and Practice. Salzburg: Austrian Geotechnical Society, 1995: 293-301.
[2]	BARLEY A D. The single bore multiple anchor system[C]. Proceedings of International Symposium on Ground Anchorages and Anchored Structures, 1997: 65-75.
[3]	程良奎. 单孔复合锚固法的机制和实践[M]. 北京: 中国科学技术出版社, 2000: 867-870.
[4]	尤春安. 全长粘结式锚杆受力分析[J]. 岩石力学与工程学报, 2000, 19(3): 339-341.
	YOU Chun'an. Mechanical analysis of fully grouted anchor[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(3): 339-341.
[5]	邬爱清, 韩军, 罗超文, 等. 单孔复合型锚杆锚固体应力分布特征研究[J]. 岩石力学与工程学报, 2004, 23(2): 247-251.
	WU Aiqing, HAN Jun, LUO Chaowen, et al. Research on stress distribution along bolts with single borehole and multiple anchors[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(2): 247-251.
[6]	康红普, 姜铁明, 高富强. 预应力在锚杆支护中的作用[J]. 煤炭学报, 2007, 32(7): 673-678.
	KANG Hongpu, JIANG Tieming, GAO Fuqiang. Effect of pretensioned stress to rock bolting[J]. Journal of China Coal Society, 2007, 32(7): 673-678.
[7]	王金华, 康红普, 高富强. 锚索支护传力机制与应力分布的数值模拟[J]. 煤炭学报, 2008, 33(1): 1-6.
	WANG Jinhua, KANG Hongpu, GAO Fuqiang. Numericals simulation study on load-transfer mechanisms and stress distribution characteristics of cable bolts[J]. Journal of China Coal Society, 2008, 33(1): 1-6.
[8]	刘永权, 刘新荣, 杨忠平, 等. 不同类型预应力锚索锚固性能现场试验对比研究[J]. 岩石力学与工程学报, 2016, 35(2): 275-283.
	LIU Yongquan, LIU Xinrong, YANG Zhongping, et al. Field test on anchorage performance of different types of prestressed cables[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(2): 275-283.
[9]	查文华, 梁译文, 王澄菡, 等. 剪切作用下新型拉力分散型麻花锚杆承载性能研究[J]. 水利水电技术:中英文, 2023, 54(11): 40-52.
	ZHA Wenhua, LIANG Yiwen, WANG Chenghan, et al. Study on the bearing capacity of a new type of tension dispersed fried dough twists bolt under shear[J]. Water Resources and Hydropower Engineering, 2023, 54(11): 40-52.
[10]	MENG Xin, REN Qingyang, XIAO Songqiang, et al. Numerical simulation of mechanical characteristics and tension-torsion coupling effect of tension-type anchor cable[J]. Engineering Computations, 2023, 40(9/10): 2 730-2 753. doi: 10.1108/EC-08-2023-0440
[11]	REN Qingyang, YANG Xujie, XIAO Songqiang, et al. Analysis of internal damage characteristics and mechanical properties of the anchorage segment in pressure-type anchor cables[J]. Engineering Computations, 2025, 42(8): DOI: 10.1108/EC-10-2024-0946.
[12]	SHANG Fulu, WANG Xuchuan, ZHU Zhen, et al. Law of mechanical properties of full-length bonded prestressed bolts Influenced by design parameters[J]. Processes, 2023, 11(4): DOI: 10.3390/pr11041221.

荷载	30	50	70	90	110
F₁	13	22	31	40	49
F₂	18	30	43	55	67
F₃	21	35	49	63	78

模拟值	τ_max1/MPa	0.16	0.20	0.24
模拟值	z/m	2.25	3.75	5.25
理论值	τ_max2/MPa	0.16	0.23	0.26
理论值	z'/m	2.50	4.00	5.50

[1]	GUO Weiqiang, LAN Tianwei, LU Kaixiang, LI Zhu, YAO Xinyu, FENG Wei. Mechanism analysis of overburden rock damage law and disaster caused by sudden water surge of thick coal seams [J]. China Safety Science Journal, 2025, 35(S2): 110-117.
[2]	DU Wenxiu, YAN Lu. Stability of open-pit mining slope: a case study of Barun mine [J]. China Safety Science Journal, 2025, 35(S2): 196-202.
[3]	LI Lei, WU Di, YANG Guanding. Rheological properties and pipeline transportation of cemented waste rock backfill slurry [J]. China Safety Science Journal, 2025, 35(S2): 29-35.
[4]	LYU Jirui, CUI Ming, CAI Qingchi, ZHAO Yuanye, LI Qingwen. Influence of EPB construction sequence and soil chamber pressure on railway subgrade settlement [J]. China Safety Science Journal, 2025, 35(S2): 58-65.
[5]	WEN Jinglin, YIN Yongming, YU Zhengxing, WANG Yifan, LU Xin'ai. Force deformation and destructive features of mine slopes under varied conditions [J]. China Safety Science Journal, 2025, 35(S2): 66-72.
[6]	ZHANG Yu, ZHAO Meng, WANG Feiyu, WANG Ruixin. Study on distribution characteristics of wind flow in stopes of Haerwusu Open-Pit Coal Mine [J]. China Safety Science Journal, 2025, 35(S1): 130-136.
[7]	CAO Weiping, XIAO Hannan, LUO Longping, LYU Pin, ZHAO Ming. On bracing mechanism and stability of two-row inclined-vertical retaining piles [J]. China Safety Science Journal, 2025, 35(6): 60-69.
[8]	LUAN Tingting, HUANG Jun, YANG Guoliang, REN Changxing, LYU Pengfei. Research progress on influencing factors of explosion limit and explosion pressure of mixed gases [J]. China Safety Science Journal, 2025, 35(6): 79-87.
[9]	WU Feiyang, CHEN Dongliang, YIN Caihong, LYU Tingwei, SHA Yanshan, CHEN Shibo. Study on medium conversion characteristics of tank boiling overflow process based on Fluent [J]. China Safety Science Journal, 2025, 35(4): 158-164.
[10]	XUE Xilong, LI Jiale, WU Shuanjun, ZHANG Xiao, LIU Bin, ZHANG Qinli. Diffusion characteristics of blasting fumes in downward drift stope and determination of ventilation parameters [J]. China Safety Science Journal, 2025, 35(4): 76-84.
[11]	ZHANG Jiayong, LYU Zuxin, CUI Xiao, GUO Liwen, WU Jianguo, FU Jingbin. Numerical simulation of CO₂ injection for fire prevention in a goaf affected by normal fault influence [J]. China Safety Science Journal, 2025, 35(4): 9-17.
[12]	LI Cong, HE Zequn, YANG Gaohao, XU Wenbo, WANG Yuepeng. Research on explosion process of fire extinguishing bombs and scattering characteristics of fire extinguishing agents [J]. China Safety Science Journal, 2025, 35(3): 107-114.
[13]	ZHU Yulong, CAO Weiping, LYU Pin, WANG Yue, ZHAO Min. Bearing behavior of inclined pile for transmission towers in loess soils under immersion [J]. China Safety Science Journal, 2025, 35(3): 169-178.
[14]	LI Qingwei, ZHU Yerui, YANG Zhixiang, LYU Ziqi, KANG Furu, REN Lifeng. Influence of temperature on combustion features of lithium-ion electric bicycles in confined spaces [J]. China Safety Science Journal, 2025, 35(3): 99-106.
[15]	LIANG Qinghua, LIU Enjie, CHEN Suzhen, WANG Weina, WANG Chunyuan. Numerical simulation and response characteristics of transient electromagnetic fields in heterogeneous strata of subway tunnels [J]. China Safety Science Journal, 2025, 35(12): 36-43.