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Abstract

In order to select the optimal plane layout scheme for advance anchor bolts in the tunnel face, based on Chinese and foreign engineering examples, the components of the plane layout scheme for advance anchor bolts in the tunnel face were summarized as shape and alignment. On this basis, four different plane layout schemes based on rectangular and circular shapes were summarized. Based on the Muzhailing Tunnel of Weiyuan–Wudu Expressway, the difference in supporting effect of different plane layout schemes for advance anchor bolts in the tunnel face was studied by numerical simulation under the conditions of different anchor bolt layout density, anchor bolt layout length, surrounding rock grade, and tunnel depth. The research results show that the different plane layout schemes for advance anchor bolts in tunnel face will have a certain influence on its supporting effect. Usually, the plane layout scheme based on a circular shape can increase the supporting effect by 2%–6% compared with the plane layout scheme based on a rectangular shape.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.030

First Page

177

Last Page

182

Submission Date

March 2025

Reference

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