Rapid Support Technology for High-Strength Prestressed Anchor Cables in Soft Rock Tunnels: A Case Study of Muzhailing
Highway Tunnel

CHEN Zhoupin; GUO Xinxin; YU Jiawu; LONG Wenhua; WANG Rui

doi:10.3973/j.issn.2096-4498.2024.08.014

2024 , Vol. 44 >Issue 8: 1669 - 1678

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.08.014

Rapid Support Technology for High-Strength Prestressed Anchor Cables in Soft Rock Tunnels: A Case Study of Muzhailing Highway Tunnel

CHEN Zhoupin ,
GUO Xinxin ,
YU Jiawu ,
LONG Wenhua ,
WANG Rui

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(1. The 2nd Engineering Co., Ltd. of China Railway Tunnel Group, Langfang 065000, Hebei, China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 3. Engineering College, Sichuan Normal University, Chengdu 610066, Sichuan, China)

Online published: 2024-09-13

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Abstract

Effective rapid support technology using high-strength prestressed anchor cables is crucial for soft rock tunnels. A case study is conducted on the Muzailing highway tunnel, detailing the construction technology and critical aspects of the anchor cable system. The study includes an examination of cable support performance through field tensioning tests, proposes a basic design principle for support parameters, and identifies key design parameters. In summary, the use of high strength prestressed anchor cables in the Muzailing highway tunnel has yielded significant results. Some conclusions are drawn as follows: (1) The high-strength prestressed anchor cable system is composed of high-strength steel strands, base plates, anchorage, resin anchorage agents, and surface collaborative support components. Critical construction tasks include drilling, resin anchoring, prestress tensioning, monitoring, and fitting installation. (2) The prestressed anchor system provides rapid and high-strength support, with a 1.7 m-length anchor achieving a force greater than 300 kN. Installation of a 10 m anchor cable is completed within 1 h. (3) Numerical calculations of excavation with anchor cable support under severe compression show that the anchor cable system effectively controls deformation. (4) The advance support technology using high-strength prestressed anchor cables in the Muzhailing highway tunnel effectively controls the deformation of surrounding rock and accelerates construction progress.

Key words： soft rock tunnel; prestressed anchor cable; anchorage performance; parameter design; engineering application

Cite this article

CHEN Zhoupin , GUO Xinxin , YU Jiawu , LONG Wenhua , WANG Rui .

Rapid Support Technology for High-Strength Prestressed Anchor Cables in Soft Rock Tunnels: A Case Study of Muzhailing Highway Tunnel

[J]. Tunnel Construction, 2024 , 44(8) : 1669 -1678 . DOI: 10.3973/j.issn.2096-4498.2024.08.014

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