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Analytical study on load transfer mechanism of a constant resistance large deformation anchor cable
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-08 , DOI: 10.1016/j.tust.2025.106370
Jiawang Zhan, Zhigang Tao, Manchao He, Xiang Wang
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-08 , DOI: 10.1016/j.tust.2025.106370
Jiawang Zhan, Zhigang Tao, Manchao He, Xiang Wang
In this paper, a Macro-NPR anchor cable capable of applying high prestress and providing high constant resistance is proposed, and the load transfer mechanism is analyzed, the constant resistance is provided by the interaction between cone and sleeve. When constant resistance is generated, the outer surface of the sleeve shows an obvious expansion and negative Poisson’s ratio effect. The distributions of radial stress, interfacial shear stress and axial force on the cone surface were analyzed, the radial stress is divided into five stages, including linear and constant change modes. In the stage of linear increase and decrease of radial stress, the axial force distribution increases in the form of rate increase and rate decrease, respectively. In the stage of constant radial stress, the axial force increases linearly, and the distribution of interfacial shear stress at all stages is like the trend of radial stress. The key design of Macro-NPR anchor cable is analyzed, when the anchor cable enters the constant resistance state, the cone is in the elastic stage, and most of the sleeve enter the plastic stage when the radial stress is the largest, and the ultimate radial strain of sleeve is 2.8 %, which is safer. Under the load of 350 kN, the stress of the expanded area is 285 MPa, which is in a stable state. An elastic-slip model of axial force fluctuation is proposed, it is considered that the change of the axial force of the Macro-NPR anchor cable is caused by the accumulation and release of the elastic energy of the cone during the tensioning process. This research can provide theoretical basis and technical guidance for the development of similar supporting anchor cables.
中文翻译:
恒阻大变形锚索载荷传递机理分析研究
本文提出了一种能够施加高预应力并提供高恒定阻力的 Macro-NPR 锚索,并分析了载荷传递机制,恒定阻力由锥体和套筒之间的相互作用提供。当产生恒定电阻时,套筒的外表面表现出明显的膨胀和负泊松比效应。分析了锥体表面的径向应力、界面剪切应力和轴向力的分布,将径向应力分为线性和常变模式五个阶段。在径向应力线性增减阶段,轴向力分布分别以速率增大和速率减小的形式增大。在径向应力恒定阶段,轴向力呈线性增加,界面剪切应力在各个阶段的分布类似于径向应力的趋势。分析了Macro-NPR锚索的关键设计,当锚索进入恒定阻力状态时,锥体处于弹性阶段,当径向应力最大时,大部分套管进入塑性阶段,套管的极限径向应变为2.8 %,更安全。在 350 kN 的载荷下,膨胀面积的应力为 285 MPa,处于稳定状态。提出了一种轴力波动的弹性滑移模型,认为 Macro-NPR 锚索轴力的变化是由锥体弹性能在张紧过程中积累和释放引起的。本研究可为类似支撑锚索的开发提供理论依据和技术指导。
更新日期:2025-01-08
中文翻译:
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恒阻大变形锚索载荷传递机理分析研究
本文提出了一种能够施加高预应力并提供高恒定阻力的 Macro-NPR 锚索,并分析了载荷传递机制,恒定阻力由锥体和套筒之间的相互作用提供。当产生恒定电阻时,套筒的外表面表现出明显的膨胀和负泊松比效应。分析了锥体表面的径向应力、界面剪切应力和轴向力的分布,将径向应力分为线性和常变模式五个阶段。在径向应力线性增减阶段,轴向力分布分别以速率增大和速率减小的形式增大。在径向应力恒定阶段,轴向力呈线性增加,界面剪切应力在各个阶段的分布类似于径向应力的趋势。分析了Macro-NPR锚索的关键设计,当锚索进入恒定阻力状态时,锥体处于弹性阶段,当径向应力最大时,大部分套管进入塑性阶段,套管的极限径向应变为2.8 %,更安全。在 350 kN 的载荷下,膨胀面积的应力为 285 MPa,处于稳定状态。提出了一种轴力波动的弹性滑移模型,认为 Macro-NPR 锚索轴力的变化是由锥体弹性能在张紧过程中积累和释放引起的。本研究可为类似支撑锚索的开发提供理论依据和技术指导。