矿山法隧道初期支护中栓钉型钢与喷射混凝土界面黏结滑移本构模型与试验研究
杨宗林1徐世文1卢志凯1路军富2李忞芮2
Constitutive Model and Experimental Study of Stud Steel-Shotcrete Interface Bond-Slip in Mining Method Tunnel Initial Support
YANG Zonglin1XU Shiwen1LU Zhikai1LU Junfu2LI Minrui2
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作者信息:1.中铁九局集团第五工程有限公司，611730，成都
2.成都理工大学地质灾害防治与地质环境保护国家重点实验室，610059，成都
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Affiliation:1.Fifth Engineering Co., Ltd. of China Railway No.9 Group Co., Ltd., 611730, Chengdu, China
2.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 610059, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.031
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中图分类号/CLCN:U455.7+2
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栏目/Col:研究报告
摘要:
［目的］为探明矿山法隧道初期支护中栓钉型钢与喷射混凝土界面黏结滑移本构关系。［方法］以栓钉长度、直径和布置形式为变化参数，设置4组不同工况，进行腹板带栓钉的型钢-喷射混凝土短柱推出试验，分析其破坏模式、荷载-滑移特性和承载力等。［结果及结论］栓钉试件的破坏模式受栓钉数量和强度影响，分为拉裂破坏和胀裂破坏两类；典型的平均黏结强度-相对滑移曲线可分为无滑移段、曲线上升段、曲线下降段和水平残余段；室内试验证明栓钉直径和布置形式是影响承载能力的主要因素；根据受力机制建立带栓钉的型钢与喷射混凝土界面的黏结滑移本构模型，并经室内试验和数值模拟双重验证，表明提出的黏结滑移本构模型精度较高。研究结果可为矿山法隧道型钢与喷射混凝土支护结构设计提供理论支持。
Abstracts:
［Objective］ It is aimed to elucidate the constitutive relationship of bond-slip at the interface between stud steel and shotcrete in the initial support of mining method tunnel. ［Method］ Four different working conditions are set by varying the length, diameter, and arrangement of the studs. Push-out tests are conducted on steel-shotcrete short columns with studs on web plate, analyzing failure modes, load-slip characteristics and bearing capacity. ［Result & Conclusion］ The failure modes of stud specimens are affected by the number and strength of studs, categorized into tensile splitting and bursting failure. The typical average bond strength-relative slip curve can be divided into four stages: no slip, ascending curve, descending curve, and horizontal residual stage. Laboratory tests demonstrate that the diameter and arrangement of the studs are primary factors affecting the bearing capacity. A bond-slip constitutive model for the interface between stud steel and shotcrete is established based on stress mechanism, validated through both laboratory tests and numerical simulations, showing high accuracy. The research results can provide theoretical support for the design of steel and shotcrete support structures of mining method tunnels.
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