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新型拉压复合型锚杆锚固性能研究:Ⅰ简化理论 被引量:2

Analysis of anchorage performance on new tension-compression anchor:Ⅰ simplified theory
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摘要 针对新型拉压复合型锚杆,假定锚固体与岩土体之间的剪应力呈三角形分布,对其锚固机理进行了研究。推导得出了拉压复合型锚杆的抗拔承载力计算公式和与拉力型锚杆抗拔承载力之比(承载比)。对承载比的曲线分析结果表明:承载比随锚固段长度的增加而增加,当锚固段长度系数k1=2.0时,承载比达到最大值2.0;承载比整体随承压锚固段长度系数k2呈碟碗形对称分布,且随k2的增加而先增加后减小,并在k2=0.5时最大;当k1≥2.0时,承载比的最大值不再随锚固段长度增加而继续增加,但是满足承载比达到最大值的k2取值区间变大。对比拉压复合型锚杆室内试验成果,推导的承载比计算值与试验值吻合较好。在相同锚固段长度下,拉压复合型锚杆抗拔承载力可达拉力型锚杆2.0倍,具有良好的工程应用前景。 The anchorage mechanism of a new tension-compression composite anchor is studied based on the assumption of triangular distribution of the shear stress between anchorage body and rock mass. The formula for calculating the uplift bearing capacity of the tension-compression composite anchor and the bearing capacity ratio of tension-compression composite anchor to tension type anchor(BCA) are derived. The analysis results for BCA show that the value of BCA increases with the increase of the anchorage length. BCA has the maximum value of 2.0 when the anchorage length coefficient k1 = 2.0. The curve, which is like a bowl, of BCA is symmetricalyl distributed over the compacted anchorage length coefficient k2. The value of BCA increases first and then decreases with the increase of k2, and it has the maximum value when k2 = 0.5. The maximum value of BCA no longer continues to increase with the increase of the anchorage length when k1 ≥2.0, but the value range of k2 expands, with which BCA has the maximum value. The calculated value of the derived BCA agrees better with the test one as compared with the model test results of tension-compression composite anchor. The uplift bearing capacity of tension-compression composite anchor can reach 2.0 times that of the tension type anchor under the same anchorage length. So the tension-compression composite anchor has a very good prospect in engineering application.
作者 涂兵雄 刘士雨 俞缙 何锦芳 周建烽 贾金青 TU Bing-xiong;LIU Shi-yu;YU Jin;HE Jing-fang;ZHOU Jian-feng;JIA Jin-qing(Fujian Engineering Technology Research Center for Tunnel and Underground Space, Huaqiao University, Xiamen 361021, China;School of Civil Engineering, Dalian University of Technology, Dalian 116024, China)
出处 《岩土工程学报》 CSCD 北大核心 2018年第12期2289-2295,共7页 Chinese Journal of Geotechnical Engineering
基金 国家自然科学基金项目(51408242,51678112,51679093,51874144) 中国博士后科学基金项目(2016M592082).
关键词 拉压复合型锚杆 锚固机理 黏结强度 抗拔承载力 tension-compression composite anchor anchorage mechanism bonding strength uplift bearing capacity
作者简介 涂兵雄(1984-),男,硕士生导师,主要从事基坑工程、边坡工程及地下空间工程等领域的教学与科研工作。E-mail:tubingxiong@163.com。
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