Laboratory Model Test Study of Tunnel Anchor

Bing Shen; Sai Qiong Long; Jun Chen; Yong Bing Li

doi:10.4028/www.scientific.net/AMR.1065-1069.333

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Laboratory Model Test Study of Tunnel Anchor
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1065-1069Laboratory Model Test Study of Tunnel Anchor

Laboratory Model Test Study of Tunnel Anchor

Abstract:

A laboratory model test of tunnel anchor was conducted to investigate its pullout mechanism and bearing capacity. Surface and rock deformation, strain and stress were measured during the entire model test process. The results show that: under pull out load, tensile failure first occurs in top surface rock near the anchor, then shear failure occurs in anchor-rock interface and rock around the anchor. The failure surface is inverted cone from the anchor bottom. Under 50 times design cable force tunnel rock is in elastic stage, suggesting that current tunnel anchor design is quite conservative and can be further optimized.