地震作用下锚固体界面剪切作用研究  

Research on the Shear Interaction of the Anchorage Body under the Action of Dynamic Load

作　　者：张魏魏 Zhang Weiwei(Poly Changda Overseas Engineering Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]保利长大海外工程有限公司,广州市510000

出　　处：《北方交通》2021年第3期31-35,共5页Northern Communications

摘　　要：采用数值模拟的方法构建了地震作用下锚杆力学响应数值模型,并通过现场试验所得数据验证了模型的合理性及可靠性。依托此数值模型,进一步研究了锚杆锚固体界面剪应力在静力和地震作用下不同的变化规律。结果表明:砂浆周围岩土体所受剪应力的值与拉拔力呈正相关,随拉拔力的增大而逐渐增大,并且由内向外逐渐扩散递减。在地震作用下,锚固体界面剪应力的峰值位置会发生移动,由初始的锚杆端头不断向锚杆底端移动,直至锚固体系整体破坏。A numerical simulation method is used to build the numerical model of mechanical response of bolt under dynamic action,and the rationality and reliability of the model are verified by the data of field test.Based on this numerical model,the different change rules of the interface shear stress of the anchor under the static and dynamic action are further studied.The results show that the value of shear stress is positively related to the pull-up force,which increases with the increase of pull-up force and gradually decreases from inside to outside.Under the dynamic action,the peak position of the shear stress of the interface between the anchor and the solid will move from the initial end of the anchor to the bottom of the anchor until the whole anchorage system is destroyed.

关 键 词：岩土锚固 锚杆 界面剪应力 数值模拟 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]