关键词: 多年冻土边坡, 新型框架通风锚杆, 降温效果, 模型试验

Abstract: The new frame ventilated anchor is an independently developed flexible support structure for frozen soil slope, which has a broad application prospect. In order to explore the cooling effect and mechanical effect of the new frame ventilation anchor, a multifunctional frozen soil laboratory box was designed, and it has the functions of loading, changing angle, adapting to the shaking table, and can simultaneously measure the temperature, moisture, wind speed and internal force. And a permafrost model slope reinforced by the frame ventilation bolts was erected to investigate the variation laws of temperature, moisture, wind speed and internal force of frame ventilation bolts subjected to freeze-thaw cycles. The closer to the anchor bolts, the more obvious the change of soil temperature and moisture. The frame ventilation anchor can absorb the cold energy and transmit and diffuse it along the axial and radial direction, with good cooling effect and maintaining the frozen state of frozen soil slope. The wind speed change law in the anchor bolt is consistent with the change of the external wind speed. A large external wind speed can motivate a more remarkable cooling effect of the frame ventilation anchor bolt. In a freeze-thaw cycle, the axial force of the anchor bolt changes in a parabola, and the axial force in the freezing period is greater than that in the thawing period. And the internal force of frame in freezing period is 2-3 times that in thawing period. The results can provide guidance for the design and engineering application of the new frame ventilation anchor.

Key words: permafrost slope, new frame ventilation anchor, cooling effect, model test