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为确定右旋螺纹钢锚杆肋间距与锚固性能的关系,对锚固于壁厚5.5和7.0 mm刚性套筒的肋间距分别为12,24,36,48 mm锚杆锚固试件进行拉拔试验,测定和计算拉拔力、剪胀位移量、耗能值、套筒周向应变等。试验结果显示,拉拔力、剪胀位移量、耗能值随肋间距的增加呈近似线性增长趋势;壁厚5.5和7.0 mm套筒拉拔试验中,肋间距48 mm试件相较肋间距12 mm试件的拉拔力分别增加了27.4%,50.43%,剪胀位移量分别提高了379.18%和813.55%,耗能值相比提高了52.06%和124.32%。周向应变量随肋间距增加呈现先增加后减小,其最大值出现在肋间距36 mm,与肋间距12 mm相比分别增加95.14%和112.84%。分析表明随着杆体肋间距的增加,嵌入锚固杆体相邻肋间距内的树脂长度增加,树脂的受剪面积增大,因而抗剪力、拉拔力在增加;树脂破坏后体积膨胀以及轴力在径向的分力增加,使得套筒周向产生应变,直接引起树脂剪胀破坏后的位移量增加。肋间距的增加可以提高锚固性能,肋间距为48 mm时右旋螺纹钢锚杆的锚固性能最好。
In order to determine the relationship between the inter-rib spacing and the anchoring performance of right-handed rebar bolts, the anchoring tests were carried out on anchor specimens anchored to rigid sleeves with wall thicknesses of 5.5 and 7.0 mm, respectively, of 12, 24, 36 and 48 mm , Determination and calculation of drawing force, dilatancy displacement, energy consumption, sleeve circumferential strain. The experimental results show that the pullout force, dilatancy displacement and energy dissipation increase linearly with the increase of rib spacing. In the sleeve pullout tests with wall thickness of 5.5 and 7.0 mm, the inter-rib spacing The pulling force of 12 mm specimens increased by 27.4%, 50.43%, dilatancy displacement increased by 379.18% and 813.55% respectively, and energy consumption increased by 52.06% and 124.32% respectively. The circumferential strain increases firstly and then decreases with the increase of intercostal distance. The maximum value appears at 36 mm intercostal spacing and increases by 95.14% and 112.84% respectively compared with 12 mm intercostal spacing. The analysis shows that with the increase of the spacing of the rod body, the length of the resin embedded in the adjacent rib spacing of the anchor rod increases, and the shearing area of the resin increases, so the shearing force and the pulling force increase; the volume expansion and the axial force In the radial component increases, making the sleeve strain in the circumferential direction, a direct result of resin dilatancy after the displacement increase. The increase of rib spacing can improve the anchorage performance. When the rib spacing is 48 mm, the anchorage performance of RH bolt is the best.