基于流变理论的压力型锚杆锚固段荷载传递机理研究  

Study on load transfer mechanism of pressure anchor anchorage section based on rheological theory

作　　者：易梅辉 高文华[1] 向德强 张宗堂[1] 张志敏[1] Yi Meihui;Gao Wenhua;Xiang Deqiang;Zhang Zongtang;Zhang Zhimin(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,411201,Xiangtan,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湘潭411201

出　　处：《应用力学学报》2020年第4期1556-1563,I0012,共9页Chinese Journal of Applied Mechanics

基　　金：湖南省自然科学基金(2020JJ4019)。

摘　　要：基于荷载传递法,采用西原模型,建立了考虑锚固界面剪切流变特性的压力型锚杆荷载传递函数的微分方程;推导了压力型锚杆锚固体周围岩土体全部处于弹性时、局部处于塑性时和局部处于滑移时,考虑锚固界面流变的锚固界面位移和锚固体轴力分别与位置、时间的关系式;最后,通过拉拔蠕变试验对理论解进行了试验验证。对比分析表明,在P为40kN、100kN、120kN的不同拉拔力作用下,不同位置、不同时刻锚固体轴力的实测值与理论值均吻合较好。反映出推导的理论公式的正确性和适用性。Based on the load transfer method, by using the visco-elasto-plastic model, the differential equation of the load transfer function of the pressure type anchor considering the shear rheological properties of the anchor interface is established. The expressions of anchor interface displacement and anchor axial force position and time considering the rheological behavior of the anchor interface are all derived when the rock mass around the pressure anchor grout is in the elastic phase, partially enters the plastic phase and partially enters the slip phase, respectively. Finally, the theoretical solution is tested and verified by the pull creep test. The comparative analysis shows that the measured values of the anchors axial force at different positions and at different times under different pull-out forces of P=40 kN,100 kN,120 kN are in good agreement with the theoretical values, reflecting the correctness and applicability of the derived theoretical formula.

关 键 词：锚固界面 剪切流变 压力型锚杆 荷载传递 

分 类 号：TU413[建筑科学—岩土工程]