土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (3): 557-561.

• 测试技术 • 上一篇    下一篇

机械锚杆围岩界面剪切特性试验研究

高文达1,2,陈 航2,程永辉2,江洎洧2,何宜霖2,李静希3   

  1. （1.三峡大学土木与建筑学院，湖北宜昌 443002;2.长江科学院岩土力学与工程重点实验室，武汉 430010；3.长江水利委员会网络与信息中心，武汉 430010）
  • 收稿日期:2023-11-09 修回日期:2023-11-12 出版日期:2024-06-30 发布日期:2024-09-17
  • 作者简介:高文达（1997-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:
    中央级公益性科研院所基本科研业务费（CKSF2021460/YT）

Experimental Study on the Shear Characteristics of a Mechanical Bolt-Surrounding Rock Interface

GAO Wenda1,2, CHEN Hang2, CHENG Yonghui2, JIANG Jiwei2, HE Yilin2， LI Jingxi3   

  1. (1.College of Civil Engineering & Architecture, Three Gorges University, Yichang 443002；
    2.Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010；
    3.Network and Information Center of Changjiang Water Resources Commission, Wuhan 430010)
  • Received:2023-11-09 Revised:2023-11-12 Online:2024-06-30 Published:2024-09-17

摘要： 机械锚杆是岩土体锚固中一种常用的锚杆，金属锚头的表面形态是影响机械锚杆与岩土体相互作用的重要因素之一，实际应用中往往根据经验设置一种形式后通过拉拔试验验证锚固力是否满足要求，并未对岩土体界面的剪切性能开展针对性的研究。针对这一问题，将锚岩相互作用的空间问题转化为平面问题，采用直剪试验的方法研究不同表面形态的锚头金属块与模拟围岩界面上剪应力与剪切位移的关系以及不同法向应力下的最大剪应力，进而获取锚岩界面的抗剪强度。结果表明：尖齿形相较于光面和平齿形，其剪切接触面的粘聚力显著增大，剪切接触面的内摩擦角也按照光面、平齿形、尖齿形的顺序逐渐增大，但幅度没有粘聚力明显，内摩擦角的范围在30°～40°之间。


关键词: 岩土锚固, 机械锚杆, 锚岩界面, 剪切特性, 直剪试验

Abstract: The mechanical anchor is a type of commonly used ground anchor in the rock and soil anchoring engineering. It can obtain the required anchoring force in a short time mainly through the mutual extrusion friction between the metal anchor head and the rock and soil mass. The surface morphology of the metal anchor head is one of the important factors that affecting the interaction between the mechanical anchor and the rock and soil mass. In the practical applications, a form is often set up according to experience, and the pull-out test is used to verify whether the anchoring force meets the requirements. There is no targeted research on the shear performance of the rock-soil interface. To solve this issue, the spatial problem of the anchor-rock interaction is transformed into a plane problem. The direct shear test method is used to study the relationship between the shear stress and the shear displacement at the interface between the anchor head metal block with different surface morphology and the simulated surrounding rock, as well as the maximum shear stress under different normal stress, so as to obtain the shear strength of the anchor-rock interface. The results show that the cohesion of the pointed tooth shape is significantly larger than that of the smooth surface and the flat tooth shear contact surface. The internal friction angle of the shear contact surface also increases gradually in the order of smooth surface, flat tooth shape and pointed tooth shape, but the amplitude is not obvious. The internal friction angle is between 30° and 40°. 

Key words: Geotechnical Anchorage, Mechanical Anchor, Anchor-Rock Interface, Shear Characteristics, Direct Shear Test

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