夹? 22 mm钢筋体复合锚杆原位锚固特性分析

›› 2014, Vol. 35 ›› Issue (11): 3139-3147.

夹? 22 mm钢筋体复合锚杆原位锚固特性分析

张景科^{1, 2}，谌文武^{1, 2}，李最雄²，郭志谦¹，王楠¹

1.兰州大学西部灾害与环境力学教育部重点实验室，兰州 730000； 2.敦煌研究院国家古代壁画与土遗址保护工程技术研究中心，甘肃敦煌 736200

收稿日期:2013-07-29 出版日期:2014-11-11 发布日期:2014-12-10
作者简介:张景科，男，1980年生，博士，副教授，主要从事岩土质古遗址保护加固方面的研究。
基金资助:
国家青年自然科学基金（No. 51108218）；国家科技支撑计划课题（No. 2013BAK08B00）。

Analysis of in-situ anchoring characteristics of composite anchor containing steel bar (? 22 mm)

ZHANG Jing-ke^{1, 2}, CHEN Wen-wu^{1, 2}, LI Zui-xiong², GUO Zhi-qian¹, WANG Nan¹

1. Key Laboratory of Mechanics on Environment and Disaster in Western China of Education Ministry, Lanzhou University, Lanzhou 730000, China; 2. National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites, Dunhuang Academy, Dunhuang, Gansu 736200, China

Received:2013-07-29 Online:2014-11-11 Published:2014-12-10

摘要/Abstract

摘要： 加钢筋体复合锚杆在土遗址载体锚固得到了较为成功的应用，但研究该类型锚杆机制刚刚起步。选择交河故城开展了夹? 22 mm钢筋复合体锚杆现场锚固测试，包括锚固性能测试和锚杆各界面层应变监测。锚固性能试验表明，3 m长复合锚杆极限锚固力可达190 kN，而且杆体表现出较强塑性变形。锚杆各界面层应变监测结果表明，钢筋-复合材料界面层轴向应变远大于其他界面层，锚固失效在该层；由于杆体的非均直性，楠竹-复合材料界面表现出轴向应变的非规律性，局部出现受压状态；楠竹-浆体界面剪应变与荷载变化一致，在较高荷载下出现剪应变向锚固末端的传递特征；鉴于杆体的多圈层构造，受力过程中出现明显的横向传递和剪胀特征。其研究成果可为复合锚杆的优化与工艺完善奠定基础。

关键词: 加钢筋复合锚杆, 极限锚固力, 界面剪应变, 荷载传递, 多圈层构造

Abstract: The composite bolt containing steel bar is applied successfully to the anchorage of earthen sites. However, its anchoring mechanism is only initially studied. In the Jiaohe ruins, a typical earthen site, the composite anchor containing steel bar (? 22 mm) were chosen to carry out the pull-out experiment as well as the interface strain monitoring among the bolt. The experimental results indicate that the maximum anchoring force of the 3 m-length bolt is over 190 kN; and the bolt shows the strong plastic deformation. The interface strain monitoring result reveals that as the damage interface the axial strain of the interface between steel and composite material is greater than the other ones. Due to the heterogeneity of the bolt, the irregularity of the axial strain occurs in the interface between bamboo and composite materials, which results in some local compression phenomenon. Meanwhile, the change of shear strain along bamboo-grout interface coincides with that of the pull-out load; and shear strain is transferred to the end of the bolt under larger load. Furthermore, because of the multilayer structure of the bolt, the transverse transfer and shearing expansion distinctly appear during pull-out experiment. The research lays the foundation to optimize the bolt structure and its anchoring craft.

Key words: composite anchor bolt containing steel bar, maximum anchoring force, interface shear strain, load transfer, multilayers structure

中图分类号:

TU 472

张景科，谌文武，李最雄，郭志谦，王楠，. 夹? 22 mm钢筋体复合锚杆原位锚固特性分析[J]. , 2014, 35(11): 3139-3147.

ZHANG Jing-ke , CHEN Wen-wu , LI Zui-xiong , GUO Zhi-qian , WANG Nan,. Analysis of in-situ anchoring characteristics of composite anchor containing steel bar (? 22 mm) [J]. , 2014, 35(11): 3139-3147.

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