Experimental Study on the Influence of Anchorage Length of Rock Anchor with Different Reinforcement Materials on Uplift Bearing Capacity

10.6911/WSRJ.202206_8(6).0009

Yanli Gao

Rock anchors ； GFRP anchor ； Anchorage length ； Uplift bearing capacity

World Scientific Research Journal

8卷6期（2022 / 06 / 01）

64 - 69

英文

With the increasing number of foundation construction projects in China, bolt support technology is widely used in rock mass reinforcement construction. As the core material, bolt reinforcement should be able to ensure sufficient safety and good durability. Glass fiber reinforced composite provides an optimal scheme for reinforcement replacement because of its excellent characteristics of light weight, high strength and corrosion resistance. Through the pull‐out test of rock anchors with different anchorage lengths and different reinforcement materials, this paper explores the influence of anchorage length on the pull‐out bearing capacity of rock anchors, and compares and analyzes the pull‐out bearing capacity characteristics and average side friction changes of GFRP anchors, hollow GFRP anchors and deformed steel anchors. The test results show that: (1) the load‐displacement curves of GFRP anchor, hollow GFRP anchor and deformed steel anchor generally increase first and then decrease slowly. (2) The anchorage length increased from 20cm to 30cm, which had the greatest impact on the bearing capacity of hollow GFRP anchor, and the uplift bearing capacity increased by 115.56%; The bearing capacity of GFRP anchor is the second, and the uplift bearing capacity is increased by 60.99%; Rebar anchor has the least influence on the bearing capacity, and the uplift bearing capacity is only increased by 2.74%. (3) Among the three kinds of material anchors, threaded steel anchors have greater uplift bearing capacity; The second is GFRP anchor; The second is hollow GFRP anchor.