[1]罗强,李亮.应用于滑坡的拉力型锚索失效机理[J].山地学报,2011,(03):348.
　LUO Qiang,LI Liang.Investigation into Failure Mechanism of Prestressed Anchor Cables Under Concentrated Tension in Contrlling Landslide[J].Mountain Research,2011,(03):348.
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应用于滑坡的拉力型锚索失效机理()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2011年03期
页码:
348
栏目:
山地学报
出版日期:
2011-01-01

文章信息/Info

Title:
Investigation into Failure Mechanism of Prestressed Anchor Cables Under Concentrated Tension in Contrlling Landslide
作者:
罗强;李亮;
中南大学 土木建筑学院，湖南 长沙 410075
Author(s):
LUO Qiang; LI Liang
College of Civil and Architectural Engineering, Central South University, Changsha 410075, China
关键词:
岩石力学; 拉力型锚索; 破坏模式; 应力分布; 失效机理
Keywords:
rock mechanics; prestressed anchor cables under concentrated tension; failure model; stress distribution; failure mechanism
分类号:
P64222,U417
文献标志码:
A
摘要:
拉力型锚索常用于公路边坡支护工程中,在进行锚固体的结构设计时,注浆体与岩石粘结界面的强度往往被高度关注。在广泛调研西南山区失稳破坏的公路边坡时发现,拉力型锚索最为薄弱的部位并非注浆体与岩石粘结界面。因此,设计11种不同配合比的注浆体,将80根拉力型锚索锚固在软岩及硬岩中,采用拉拔试验对锚索的破坏模式进行研究。结果表明:拉力型锚索常见的破坏模式是钢绞线与注浆体之间的脱粘破坏。选择合理的力学计算模型,获得内锚固段两个粘结界面的应力分布弹性解,分析表明:钢绞线与注浆体粘结界面的峰值应力位于锚孔孔口处,应力分布不均匀程度高,致使孔口处的钢绞线注浆体粘结界面首先发生脱粘破坏,脱粘界面以渐进的方式向内锚固...
Abstract:
Prestressed anchor cable under concentrated tension is often applied in supporting projects of road slope, when designing structure of anchorage, the bond strength of interface between grouting and rock is highly concerned, from investigatings on unstable road slope in mountainous area of southwest China, the weakest part of prestressed anchor cable under concentrated tension was not the interface between grouting and rock. Therefore, eleven grouting materials with different mixture ratios are designed，in which eighty prestressed anchor cables under concentrated tension are embedded in soft rock and hard rock. Then the failure mode of prestressed anchor cables have been obtained by pullout tests in laboratory. The test results indicate that the dominant failure model of prestressed anchor cable under concentrated tension is debonding along the cablegrouting material interface. The paper abtains the elastic solution of stress distribution on two bond interfaces of embedment section via rational mechanical computation mode. The analyses demonstrate that the peak stress of bond interface between cable and grouting is located at the holetop of anchorage hole, the stress distribution is highly uneven, which causes debonding of the cablegrouting material interface of holetop first, the debonding interface transfers to the end of embedment section in progress and finally draw out the cable from the grouting. It should be attach great importance to the study results mentioned above in the design of anchorage engineering and revision of technical specification for prestressed anchor cables in the future.

备注/Memo

备注/Memo:
收稿日期(Received date)：2010-08-11；改回日期(Accepted) : 2010-11-28。
基金项目（Foundation item）：交通部西部交通建设科技项目（编号: 2006318802111）。\[Western Traffic Constructionresearch Project of Communications and Transportation Ministry (No. 2006318802111).\]
作者简介（Biography）：罗强 (1970-)，男，贵州思南县人，中南大学博士研究生，高级工程师，主要从事公路工程、岩土工程方面的研究。\[Luo Qiang, male, come from Guizhou Province, Doctoral student of Central South University, Senior engineer, Engage in research on highway engineering and geotechnical engineering. Address: Communications and transportation department, No. 111 Yan’anxi Road, Guiyang, Guizhou, 550003, P. R. China Mobile phone: 13608516622 \] E-mail: Luoqiang@vip.sina.com
更新日期/Last Update: 1900-01-01