地震作用下顺倾岩体边坡锚固界面剪切作用分析

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摘要基于FLAC3D软件，尝试修正的cable单元建立全长黏结锚杆锚固顺倾岩体边坡数值分析模型，改进剪应力提取方法，分别模拟分析了锚杆-注浆体界面上和注浆体-岩体界面上的剪切作用及其演化。研究发现：注浆体-岩体界面上比杆体-注浆体界面上的剪应力小得多，且均以锚杆上的中性点为界方向相反，分布很不均匀，中性点附近大，锚杆两端小，随边坡地震响应增强锚固界面脱粘并向锚杆两端发展，直至全部脱粘致使锚固破坏。获得了地震波作用下边坡两锚固界面上剪应力及其分布和脱粘破坏过程，揭示了锚固界面上的剪切相互作用和锚固破坏机制，并得到了试验印证。为边坡锚固设计和施工提供了参考。

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	言志信1
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	张森1
	龙哲1
	周小亮1

关键词 ：岩体边坡, 锚固, 杆体-注浆体界面, 注浆体-岩体界面, 峰值剪应力

Abstract：Based on the software FLAC3D, the modified cable element was used to establish an overall length grouted bolt anchorage inclined rock side slope numerical analysis model, and improve the shear stress extraction method.Shear action and its evolution on bolt-grout and grout-rock interfaces were simulated and analyzed, respectively.The study showed that shear stress on a grout-rock interface is much smaller than that on a bolt-grout one; both shear stresses take bolt neutral point as the dividing line with left and right in opposite directions; distribution of shear stress is very uniform with smaller both ends and larger near neutral point; with increase in side slope seismic response, anchorage interface begins to be unstuck and this phenomenon expends towards bolt ends until whole interface is unstuck and anchorage fails to acquire shear stresses and their distributions of side slope’s two anchorage interfaces and the unsticking failure process; shear interaction on anchorage interface and anchorage failure mechanism are revealed, and test verification is conducted; the study results provide a reference for side slope anchorage design and construction.

Key words： rock side slope anchorage bolt-grout interface grout-rock interface peak shear stress

收稿日期: 2018-04-16

引用本文:

言志信1,2，张森1，龙哲1，周小亮1. 地震作用下顺倾岩体边坡锚固界面剪切作用分析[J]. 振动与冲击, 2020, 39(3): 260-268.
YAN Zhixin1,2, ZHANG Sen1, LONG Zhe1, ZHOU Xiaoliang1. Shear action analysis for inclined rock side slope anchorage interface under earthquake. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 260-268.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I3/260

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