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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Study on effective support mechanism of tunnels under complex geological conditions

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复杂地质条件下巷道有效支护机理研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Nov.2025, Vol.48 No.11: 1542-1548, 1555

DOI: 10.3969/j.issn.1003-5060.2025.11.016

Authors

HUANG Songtao, YUAN Haiping, XIA Zijin, YU Xuyang

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: This paper takes a large-scale iron mine project in South China as an example, and uses FLAC3D software to independently program and simulate tunnels crossing fault fracture zone orthogonally. Based on the simulation analysis results, support schemes are proposed. The evolution law of surrounding rock damage in each support scheme is analyzed from multiple perspectives, and the advantages and disadvantages of the schemes are compared horizontally. At the same time, suitable support forms under different working conditions are proposed. Research has shown that the failure approach index (FAI) zoning can determine the degree of surrounding rock damage and define the area of surrounding rock damage; given the influence of surrounding rock lithology and fault geological structure, the areas near the hanging wall and footwall of the fault are identified as the key focus for tunnel support in this project; the impact rate of surrounding rock can comprehensively evaluate the pros and cons of support design schemes, thus facilitating the selection of suitable support forms. The research results provide an effective method for targeted and purposeful support of tunnels in special areas, which can provide reference for practical engineering design and safe construction.

Keywords: fault fracture zone; stability of surrounding rock; support form; failure approach index (FAI); impact rate of surrounding rock

作者信息

黄松涛，袁海平，夏子晋，于旭阳

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 文章以华南某大型铁矿工程为例, 通过 FLAC3D 软件自主编程模拟分析正交穿越断层破碎带巷道, 基于模拟分析结果提出支护方案, 多角度分析各支护方案围岩破损演化规律, 横向对比方案优劣, 同时提出不同工况条件下适宜的支护形式。研究表明: 破坏接近度(failure approach index, FAI)指标分区可确定围岩损伤程度, 界定围岩破损区域; 受现场围岩岩性和断层地质构造影响, 该工程断层上下盘临近区域为巷道支护关注重点; 围岩影响率可综合评估支护设计方案优劣, 便于选择适宜支护形式。该研究成果为特殊地段巷道有针对性和目的性支护提供了一种有效方法, 可为实际工程设计和安全施工提供借鉴。

关键词: 断层破碎带；围岩稳定性；支护形式；破坏接近度(FAI)；围岩影响率

Funding

国家自然科学基金资助项目（51874112）；安徽高校协同创新资助项目（GXXT-2020-055）

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