新型拉压复合型锚杆锚固性能研究Ⅳ:数值模拟  

Anchorage performance of new tension-compression anchorⅣ:numerical simulation

作　　者：涂兵雄[1] 魏健 贾金青[2] 俞缙[1] 李志伟 蔡奇鹏[1] TU Bingxiong;WEI Jian;JIA Jinqin;YU Jin;LI Zhiwe;CAI Qipeng(Fujian Engineering Technology Research Center for Tunnel and Underground Space,Huaqiao University,Xiamen 361021,China;School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Fujian Academy of Building Research CO.,LTD.,Fuzhou 350108,China;Fujian Provincial Key Laboratory of Green Building Technology,Fuzhou 350108,China)

机构地区：[1]华侨大学福建省隧道与城市地下空间工程技术研究中心,福建厦门361021 [2]大连理工大学建设工程学院,辽宁大连116024 [3]福建省建筑科学研究院有限责任公司,福建福州350108 [4]福建省绿色建筑技术重点实验室,福建福州350108

出　　处：《岩土工程学报》2024年第12期2642-2651,共10页Chinese Journal of Geotechnical Engineering

基　　金：福建省科技计划项目(2022I0014,2022Y4015,2022Y0029);福厦泉国家自主创新示范区协同创新平台项目(3502ZCQXT2022002);厦门市建设局建设科技项目(XJK2022-1-12);中央高校基本科研业务费专项资金项目(ZQN-1012)。

摘　　要：新型拉压复合型锚杆具有良好的锚固性能,在抗浮工程中优势明显并逐渐推广应用,但其荷载传递规律尚不明晰。基于此,针对已完成的现场试验,对拉压复合型锚杆的荷载传递机理开展了数值模拟研究。结果表明,拉压复合型锚杆筋体轴向拉力在承压锚固段保持不变,拉力传递至受拉锚固段后大幅降低,破坏时受拉承载系数略低于受拉长度系数。承压锚固段灌浆体受压,压应力向端头递减;受拉锚固段灌浆体受拉,拉应力先增大后减小,且最大拉应力显著低于全黏结型锚杆;优化拉压长度比,可以进一步减小受拉锚固段灌浆体受到的轴向拉应力。拉压复合型锚杆浆土界面剪应力在承载体处最大,向两侧减小;与全黏结型和压力型锚杆相比,相同拉力下,拉压复合型锚杆浆土界面剪应力显著减小,应力集中现象明显削弱,且分布更加均匀。The new tension-compression anchor(TC anchor)has excellent anchorage performance and obvious advantages in anti-floating engineering,gradually gaining widespread application.However,its load transfer mechanism has been not yet clearly understood.In light of this,a study on the load transfer mechanism of the TC anchor is conducted based on the completed field tests through the numerical simulation method.The results indicate that the axial tension in the rebar of the TC-anchor remains constant in the compression anchorage segment but significantly decreases after transferring to the tension anchorage segment.During failure,the tension bearing coefficient of the TC anchor is slightly lower than the tension length coefficient.In the compression anchorage segment,the grouting materials experience compression,with the compressive stress decreasing towards the head.In the tension anchorage segment,the grouting materials experience tension,and the tensile stress increases first and then decreases,and the maximum tensile stress is significantly lower than that of the wholly grouted anchor.Optimizing the tension-compression length ratio can further reduce the axial tensile stress in the grouting materials of the tension anchorage segment.The shear stress at the grout-soil interface of the TC anchor is the highest at the load-bearing body and decreases towards both sides.Compared to the wholly grouted anchor and pressure-type anchor under the same tension,the TC anchor exhibits significantly reduced shear stress at the grout-soil interface,weakened stress concentration,and a more uniform distribution.

关 键 词：拉压复合型锚杆 剪应力 受拉承载系数 受拉长度系数 协同破坏 

分 类 号：TU455[建筑科学—岩土工程]