峰前循环荷载作用下 NPR 锚杆锚固结构面
抗剪强度特性研究

金属矿山 ›› 2025, Vol. 54 ›› Issue (9): 78-87.

峰前循环荷载作用下 NPR 锚杆锚固结构面抗剪强度特性研究

陶志刚^1,2 　张腾伍^1,2 　洪陈杰^1,2 　张海江³

1. 中国矿业大学(北京)力学与土木工程学院,北京 100083;2. 深部岩土力学与地下工程国家重点实验室,北京 100083; 3. 绍兴文理学院土木工程学院,浙江绍兴 312000

出版日期:2025-09-15 发布日期:2025-10-09
作者简介:陶志刚(1981—),男,教授,博士,博士研究生导师。
基金资助:
国家自然科学基金面上项目(编号:42377154)。

Research on Shear Strength Characteristics of Anchoring Rock Joint of NPR Anchor Bolt under Pre-peak Cyclic Load

TAO Zhigang ^1,2 　 ZHANG Tengwu ^1,2 　 HONG Chenjie ^1,2 　 ZHANG Haijiang ³

1. School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China; 2. State Key Laboratory of Deep Geotechnical Mechanics and Underground Engineering,Beijing 100083,China; 3. School of Civil Engineering,Shaoxing University,Shaoxing 312000,China

Online:2025-09-15 Published:2025-10-09

摘要/Abstract

摘要： NPR 锚杆锚固结构面在静态剪切荷载作用下表现出超常抗剪性能,然而在动态循环荷载作用下的力学响应尚需进一步验证。采用经加工的原岩试样,进行均质砂岩结构面的峰前循环加载剪切试验,对比分析无锚固和 NPR 锚杆锚固 2 种工况下循环加载次数、加载速率、不同幅值等因素对结构面剪切强度的影响规律。结果表明:① 循环次数为 80 次时,无锚固结构面的抗剪强度达到峰值;相比之下,NPR 锚杆锚固结构面的峰值抗剪强度明显提升。 ② 循环加载速率由 1 kN/ s 增大至 1. 5 kN/ s 时,无锚固结构面抗剪强度下降较快;与此相反,NPR 锚杆锚固结构面在加载速率增大时,峰值抗剪强度呈现更大的提升幅度。 ③ 循环加载幅值由 50%τmax 增大至 80%τmax,无锚固结构面抗剪强度降低;而 NPR 锚杆锚固结构面的抗剪强度增大,有效改善了未锚固结构面的脆性破坏特征。 ④ 不同法向应力下,NPR 锚杆锚固结构面的抗剪强度均比无锚固结构面得到显著提升。上述研究结果可为露天矿开采的抗震和防爆设计提供科学依据。

关键词: 峰前循环加载　锚固剪切试验　岩体结构面　 NPR 锚杆

Abstract: The NPR anchor bolt anchoring structural surface exhibits extraordinary shear resistance under static shear loads,but the mechanical response under dynamic cyclic loads still needs further verification. Using processed original rock samples,a pre-peak cyclic loading shear test was conducted on a homogeneous sandstone structural plane. The influence of factors such as cyclic loading times,loading rates,and different amplitudes on the shear strength of the structural plane was compared and analyzed under two working conditions:non anchoring and NPR anchor anchoring. The results show that:① When the number of cycles is 80,the shear strength of the non anchored structural surface reaches its peak;In contrast,the peak shear strength of the NPR anchor rod anchoring structure surface has significantly improved. ② The cyclic loading rate increases from 1 kN/ s to 1. 5 kN/ s,and the shear strength of the non anchored structural plane decreases faster;On the contrary, when the loading rate increases,the peak shear strength of the NPR anchor bolt anchoring structure surface shows a greater improvement. ③ The cyclic loading amplitude increases from 50% τmax to 80% τmax,and the shear strength of the non-anchored structural plane decreases. However,the shear strength of the anchored structural surface of NPR anchor rod increases,effectively improving the brittle failure characteristics of the no-anchored structural surface. ④ Under different normal stresses,the shear strength of the NPR anchor bolt anchoring structure surface is significantly improved compared to the no-anchoring structure surface. The above research results can provide scientific basis for seismic and explosion-proof design of open-pit mining.

Key words: pre-peak cyclic loading,anchor shear test,rock mass discontinuity,NPR anchor

中图分类号:

TD315

陶志刚, 　张腾伍, 　洪陈杰, 　张海江. 峰前循环荷载作用下 NPR 锚杆锚固结构面抗剪强度特性研究[J]. 金属矿山, 2025, 54(9): 78-87.

TAO Zhigang , 　 ZHANG Tengwu , 　 HONG Chenjie , 　 ZHANG Haijiang . Research on Shear Strength Characteristics of Anchoring Rock Joint of NPR Anchor Bolt under Pre-peak Cyclic Load [J]. Metal Mine, 2025, 54(9): 78-87.

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