锚固界面剪切力学特征及参数优化试验研究  

Experimental Study on Shear Mechanical Characteristics and Parameter Optimization of Anchoring Interface

作　　者：田欣[1] 路燕泽[1,2,4] 陈彦亭 于庆磊 王社光 曹永胜[5] TIAN Xin;LU Yanze;CHEN Yanting;YU Qinglei;WANG Sheguang;CAO Yongsheng(Hebei Iron and Steel Group Mining Co.,Ltd.,Tangshan 063000,China;Shahe Zhongguan Iron Mine Co.,Ltd.,Hebei Iron and Steel Group,Xingtai 054100,China;Hebei Iron and Steel Group Mining Design Co.,Ltd.,Tangshan 063000,China;Hebei Complex Iron Ore Low Carbon Intelligent and Efficient Mining Technology Innovation Center,Xingtai 054100,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]河北钢铁集团矿业有限公司,河北唐山063000 [2]河北钢铁集团沙河中关铁矿有限公司,河北邢台054100 [3]河北钢铁集团矿山设计有限公司,河北唐山063000 [4]河北省复杂铁矿低碳智能高效开采技术创新中心,河北邢台054100 [5]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《金属矿山》2024年第8期35-44,共10页Metal Mine

基　　金：河北省重点研发计划项目(编号:20374103D)。

摘　　要：为加强软岩巷道支护性能,改善锚杆支护设计及其参数,针对锚固系统中界面力学特征以及失效破坏模式进行试验探究,并利用FLAC3D数值模拟方法,以锚固剂、锚固长度为研究参数,对围岩变形、锚杆受力以及塑性区分布规律进行分析、探究,确定科学合理的软岩巷道支护参数。试验研究表明:钢筋—锚固剂界面剪切力学性能,随锚固剂由M20砂浆材料换为高纤维含量ECC-2%材料,其界面峰值剪切应力上涨了122%;当锚固剂—岩石界面黏结强度足够高时,影响其稳定性的主要因素即为岩石自身抗拉强度和内聚力;当采用锚固剂类型为ECC-2%且锚固长度为2.2 m的支护参数时,巷道顶板位移变形量、两帮位移、塑性区范围较优化前的方案分别降低了12.9%、29.15%、20.0%,锚杆最大轴力提高了95.5%。研究结果为软弱围岩支护参数的优化提供了科学依据,并且对于类似工程的支护设计和优化具有参考价值。In order to strengthen the support performance of soft rock roadway and improve the anchor support design and its parameters,the interface mechanical characteristics and failure damage mode of the anchoring system were investigated experimentally,and FLAC3D numerical simulation method was used to analyze and investigate the deformation of the surrounding rock,the anchor force and the distribution law of the plastic zone with the anchoring agent and the anchoring length as the research parameters,so as to determine the scientifically reasonable support parameters of the soft rock roadway.The experimental study shows that:the shear mechanical properties of the steel-anchor interface,with the anchor from the M20 mortar material for high fiber content ECC-2%material,the peak shear stress of the interface rose 122%;when the anchor-rock interface bond strength is high enough,the main factors affecting the stability of its own tensile strength of the rock and cohesion;when the type of anchor ECC-2%and anchorage length of 2.2 m of the support.When the support parameters of ECC-2%and 2.2 m anchorage length are adopted,the displacement and deformation of the roof plate,the displacement of the two gangs,and the range of the plastic zone are reduced by 12.9%,29.15%,and 20.0%,respectively,and the maximum axial force of the anchor rods is increased by 95.5%compared with that of the pre-optimization scheme.The results of the study provide a scientific basis for the optimization of the support parameters of weak perimeter rock,and have reference value for the support design and optimization of similar projects.

关 键 词：锚杆支护 界面力学 性能强化 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]