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预应力锚杆内力传递分布规律与时空效应

黄雪峰, 马龙, 陈帅强, 孔洋

黄雪峰, 马龙, 陈帅强, 孔洋. 预应力锚杆内力传递分布规律与时空效应[J]. 岩土工程学报, 2014, 36(8): 1521-1525. DOI: 10.11779/CJGE201408019
引用本文: 黄雪峰, 马龙, 陈帅强, 孔洋. 预应力锚杆内力传递分布规律与时空效应[J]. 岩土工程学报, 2014, 36(8): 1521-1525. DOI: 10.11779/CJGE201408019
HUANG Xue-feng, MA Long, CHEN Shuai-qiang, KONG Yang. Distribution characteristics and time-space effects of internal force of prestressed anchor rod[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(8): 1521-1525. DOI: 10.11779/CJGE201408019
Citation: HUANG Xue-feng, MA Long, CHEN Shuai-qiang, KONG Yang. Distribution characteristics and time-space effects of internal force of prestressed anchor rod[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(8): 1521-1525. DOI: 10.11779/CJGE201408019

预应力锚杆内力传递分布规律与时空效应  English Version

详细信息
    作者简介:

    黄雪峰(1960- ),男,博士,教授,主要从事特殊土与非饱和土、湿陷性黄土、桩基工程、基坑支护等方面的教学与研究工作。E-mail: hxfen60@163.com。

  • 中图分类号: TU470

Distribution characteristics and time-space effects of internal force of prestressed anchor rod

  • 摘要: 为了得到预应力锚杆在基坑开挖过程中受力分布特性,结合西宁火车站综合改造项目,对桩锚支护结构在不同阶段锚杆的受力特征进行现场内力测试试验,试验测得了锚杆轴力和摩阻力随时间及空间分布规律,分析了锚杆支护过程边坡潜在滑移面的动态演化规律,探讨了预应力锚杆自由段与锚固段相互关系,结果表明:未锁定时,受力增加了预应力锚杆的初始应力,对其受力不利,应严格予以控制,锁定后,锚杆摩阻力沿锚固段渐进式减小,摩阻力不断向后传递,但摩阻力峰值并未出现改变;锚杆锚固作用使得边坡潜在滑移面向深部转移,同时,滑移面剪出口沿坡脚向上转移,剪出口位于距基坑底部约H/3处;预应力锚杆自由段长度越长受力越好,但应以超出预估可能出现最终滑移面一定深度最为经济合理,在满足锚固力要求的情况下,锚固段长度存在一临界值,超过临界值则浪费。
    Abstract: This paper aims to study the distribution of forces along the prestressed anchor rod during the excavation of foundation pits. A filed experiment is carried out to investigate mechanical behavior of anchor rod through a comprehensive reconstruction project at Xining Railway Station. The temporal and spatial distribution of axial forces and frictional forces is obtained. The development of potential slip plane is analyzed, and the relation between free part and anchored part of the prestressed anchor rod is discussed. The results show that, if unanchored, the initial stress of the prestressed anchor rod will be increased which is unfavorable. If anchored, the shear stress decreases steadily along the anchored part and then transports backward, but the maximum shear stress doesn’t change. The potential slip plane of slope moves deeper inward due to the effects of anchor rod. At the same time, the exit of the slip plane moves upwards from the foot of the slope, and locates at about one third the height from the bottom of the pit. On one hand, the prestressed anchor rod with a longer free length has better mechanical performance, however the one with a certain length that is enough to prevent the potential slip of slope is more economical and reasonable. On the other hand, the anchored length of the anchor rod, which provides sufficient anchoring force, is better to be short so that the anchor is economical and efficient.
  • [1] 中国土木工程学会土力学及岩土工程分会. 深基坑支护技术指南[M]. 北京: 中国建筑工业出版社, 2012. (Chinese Institution of Soil Mechanics and Geotechnical Engineering -China Civil Engineering Society. Guide supporting technology of deep foundation pit[M]. Beijing: China Architecture and Building Press, 2012. (in Chinese))
    [2] 程良奎. 岩土锚固的现状与发展[J]. 土木工程学报, 2001, 34(3): 7-12. (CHENG Liang-kui. Present status and development of ground anchorages[J]. China Civil Engineering Journal, 2001, 34(3): 7-12. (in Chinese))
    [3] 张季如, 唐保付. 锚杆荷载传递机理分析的双曲函数模型[J]. 岩土工程学报, 2002, 24(2): 188-192. (ZHANG Ji-ru, TANG Bao-fu. Hyperbolic function model to analyze load transfer mechanism on bolts[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(2): 188-192. (in Chinese))
    [4] 陈广峰, 米海珍. 黄土地层中锚杆受力性能试验分析[J]. 甘肃工业大学学报, 2003, 29(1): 116-119. (CHEN Guang-feng, MI Hai-zhen. Experimental analysis of anchor’s stress performance in collapsible loess layer[J]. Journal of Gansu University of Technology, 2003, 29(1): 116-119. (in Chinese))
    [5] 丁秀丽, 盛 谦, 韩 军, 等. 预应力锚索锚固机理的数值模拟试验研究[J]. 岩石力学与工程学报, 2002, 21(7): 980-988. (DING Xiu-li, SHENG Qian, HAN Jun, et al. Numerical simulation testing study on reinforcement mechanism of prestressed anchorage cable[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(7): 980-988. (in Chinese))
    [6] PHILLIPS S H E, Factors affecting the design of anchorages in rock[R]. London: cementation Research Ltd, 1970.
    [7] 曾宪明, 林大路, 李世民, 等. 锚固类结构杆体临界锚固长度问题综合研究[J]. 岩石力学与工程学报, 2009, 28(增刊2): 3609-3625. (ZENG Xian-ming, LIN Da-lu, LI Shi-min, et al. Comprehensive research of critical anchorage length problem of anchorage structure[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S2): 3609-3625. (in Chinese))
    [8] 王明怒, 何修仁, 郑雨天. 全长锚固锚杆的力学模型及应用[J]. 金属矿山, 1983(4): 21-24. (WANG Ming-shu, HE Xiu-ren, ZHENG Yu-tian.The mechanics model of full lengthanchoring bolts and its application[J]. Metal Mine, 1983(4): 21-24. (in Chinese))
    [9] 周德培, 常 春. 软岩高边坡开挖过程中锚杆轴力分析[C]// 中国岩石力学与工程学会第五次学术大会论文集. 上海, 1998. (ZHOU Pei-de,CHANG Chun. Analysis for the axial force of bolt in excavation ot high slope in weak rockmass[C]// Chinese Society for Rock Mechanics and Engineering. Shanghai, 1998. (in Chinese))
    [10] 王 仁, 黄文彬, 黄筑平, 等. 塑性力学引论[M]. 北京: 北京大学出版社, 2009. (WANG Ren,HUANG Wen-bin,HUANG Zhu-ping,et al. Plastic dynamics[M]. Beijing :Peking University Press ,2009. (in Chinese))
    [11] 黄雪峰, 李 佳, 崔 红, 等. 非饱和原状黄土垂直高边坡潜在土压力原位测试试验研究[J]. 岩土工程学报, 2010, 32(4): 500-506. (HUANG Xue-fen, LI Jia, CUI Hong, et al. Distribution characteristics of earth pressure for unsaturated intact loess[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(4): 500-506. (in Chinese))
    [12] 王曙光. 深基坑支护事故处理经验录[M]. 北京: 机械工业出版社, 2005. (WANG Shu-guang. Foundation pit accident treatment experience record[M]. Beijing: Mechanical Industry Press, 2005. (in Chinese))
    [13] JGJ 120—2012《建筑基坑支护技术规程》[S]. 北京: 中国建筑工业出版社, 2012. (JGJ 120—2012 China technical specification for retaining and protection of building foundation excavations[S]. Beijing: China Architecture and Building Press, 2012. (in Chinese))
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出版历程
  • 收稿日期:  2013-11-20
  • 发布日期:  2014-08-18

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