关键词: 袖阀布袋锚杆;松软地层;抗拔承载力;注浆试验;抗拔试验;

Abstract: In reinforcing loose-soft stratum by steel pipe anchor, it is not easy to control the grouting quality and cannot give full play to the bearing capacity of the anchor.Therefore, the sleeve valve cloth bag anchor is proposed to reinforce the loose-soft stratum.The sleeve valve cloth bag grouting test and the uplift test, as well as the comparison test between the sleeve valve cloth bag anchor and steel pipe anchor were carried out in loose-soft backfill soil.The results showed that:(1)The maximum grouting pressure born by the sleeve valve bag was 1.4 MPa.After the bag was broken, the grouting slurry could wrap around the anchor, restricting flow of the grouting slurry.(2)After the bag was broken, a cylindrical grouting body with a diameter of 15 cm was formed and wrapped around the anchor.However for the steel pipe anchor, the leakage and diffusion of grouting slurry were serious, and the distribution of the grouting slurry around the anchor was uneven.Therefore, the sleeve valve cloth bag anchor had a more reliable grouting quality and anchoring force.(3) The maximum anti-pulling force of the sleeve valve cloth bag anchor was 103.5%～122.8% of the standard value of anti-pulling capacity of the anchor body, showing that strength of anchor body material was put into full play.(4)There was no obvious plastic deformation when the ANCHOR-2 anchor was damaged, indicating that the anchor was firmly bonded with the stratum and the grouting effect was good.

Key words: sleeve valve cloth bag anchor; loose-soft stratum; anti-pulling capacity; grouting test; uplist test;