岩土力学 ›› 2019, Vol. 40 ›› Issue (7): 2882-2890.doi: 10.16285/j.rsm.2018.0425

• 数值分析 • 上一篇    

地震作用下含软弱层岩体边坡锚固 界面剪切作用分析

言志信1, 2，龙 哲1，屈文瑞1，张森1, 3，江平1   

  1. 1. 兰州大学 土木工程与力学学院，甘肃 兰州 730000；2. 河南城建学院 土木与交通工程学院，河南 平顶山 467036； 3. 云南省公路科学技术研究院，云南 昆明 650051
  • 收稿日期:2018-04-02 出版日期:2019-07-11 发布日期:2019-07-28
  • 通讯作者: 江平，女，1961年生，本科，副教授，主要从事工程中的力学问题研究。E-mail: jp61@163.com E-mail: yzx10@163.com
  • 作者简介:言志信，男，1961年生，博士（后），特聘教授，博士生导师，主要从事土木工程和地质工程方面的研究。
  • 基金资助:
    国家自然科学基金面上项目(No. 41372307，No. 51478065)；甘肃省建设科技攻关项目(No. kjxm2014-42，No. JK2013-20)。

The effect of shear on the anchorage interface of rock slope with weak layers under earthquake

YAN Zhi-xin1, 2, LONG Zhe1, QU Wen-rui1, ZHANG Sen1, 3, JIANG Ping1   

  1. 1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China; 2. School of Civil and Traffic Engineering, Henan University of Urban Construction, Pingdingshan, Henan 467036, China; 3. Yunnan Research Institute of Highway Science and Technology, Kunming, Yunnan 650051, China
  • Received:2018-04-02 Online:2019-07-11 Published:2019-07-28
  • Supported by:
    This work was supported by the General Program of National Natural Science Foundation of China(41372307, 51478065) and Programs for Science and Technology Development of Gansu Province (kjxm2014-42, JK2013-20).

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摘要： 基于FLAC3D软件，以含软弱层的锚固岩体边坡为研究对象，通过修正的cable单元建模和改进剪应力提取方法，分别模拟分析了地震作用下含软弱层岩体边坡两锚固界面剪切作用及其演化。研究发现：砂浆-岩体界面上的剪应力远比锚杆-砂浆界面上的小，并均以锚杆上的中性点为界方向相反，分布很不均匀，且均在中性点附近发生突变；随边坡地震响应增强危岩中的锚固界面率先脱黏，基岩中的锚固界面紧随脱黏，且脱黏分别向锚头和锚根发展，直至拉拔段或锚固段全部脱黏锚固破坏。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黏破坏过程，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。

关键词: 岩质边坡, 锚固, 锚杆-砂浆界面, 砂浆-岩体界面, 峰值剪应力

Abstract: In this study, the anchored rock slope with weak intercalated layers was investigated by using the FLAC3D software. The modified cable element modeling and improved shear stress extraction method were used to analyze the shear between two anchorage interfaces of the anchored rock slope and its evolution law, respectively. The results showed that the shear stress at the mortar-rock interface was much smaller than that at the anchor-mortar interface, while these two shear stresses extended in opposite directions from the neutral point on the anchor rod. In addition, the shear stress distributed unevenly and mutated near the neutral point. With the increase of the seismic response of the slope, the anchorage interface in the unstable rock was first debonded, and then the anchorage interface in the bedrock was also debonded. Meanwhile, the debonding propagated toward the anchor head and the anchor root, respectively, until the pull-out section or the anchorage section was completely debonded and destroyed. We obtained the shear stress, the distribution of shear stress, and the debonding failure process at two anchorage interfaces of the slope under earthquake. The shearing interaction and anchorage failure mechanism at the anchorage interface were revealed and verified by experiments. The research results provide important references for the design and construction of the anchorage slope.

Key words: rock slope, anchorage, anchor-mortar interface, mortar-rock interface, peak shear stress

中图分类号: 

  • TU 435
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