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隧道开挖面预注浆加固稳定性理论计算模型

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为了支撑隧道开挖面预注浆参数的定量化设计,建立考虑预注浆加固作用的开挖面稳定性计算模型,采用极限平衡法及强度折减法推导开挖面稳定系数计算公式.研究表明:理论模型计算结果与数值模型、模型试验结果吻合较好,平均相对误差为4.3％;隧道开挖面稳定性随着围岩力学参数、黏聚力增强系数、预注浆范围的增加而提高;开挖面临界注浆范围约为0.4D～0.8D,当预注浆范围超过临界注浆范围后,预注浆加固效果最佳,且开挖面稳定性不再受加固范围影响;得到考虑隧道围岩强度参数、开挖方法、未支护段长度、黏聚力增强系数的开挖面安全系数,为预注浆参数设计提供参考.
Theoretical Calculation Model for Stability of Tunnel Excavation Face with Pre-grouting Reinforcement
To support the quantitative design of pre-grouting parameters for tunnel excavation faces,a stability cal-culation model for excavation faces considering the effect of pre-grouting reinforcement was established.The ulti-mate equilibrium method and the strength reduction method were employed to derive a calculation formula for the stability coefficient of the excavation face.The study indicates that the theoretical model's results closely align with numerical models and experimental results,with an average relative error of 4.3％.The stability of the tunnel excava-tion face is improved with increase in the mechanical parameters of the surrounding rock,cohesion enhancement factor,and the pre-grouting range.The critical grouting range for the excavation face is approximately 0.4D-0.8D;when the pre-grouting range exceeds this critical value,the reinforcement effect is optimal,and the stability of the excavation face is no longer affected by the reinforcement range.A safety coefficient for the excavation face is pro-posed,considering parameters such as surrounding rock strength,excavation method,unsupported section length,and cohesion enhancement factor,providing a reference for the design of pre-grouting parameters.

Tunnel engineeringExcavation face stabilityPre-grouting of excavation faceTheoretical calculation model

张霄、王明年、于丽、王志龙、刘大刚、马治中

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西南交通大学土木工程学院,成都 610031

极端环境岩土和隧道工程智能建养全国重点实验室,成都 610031

四川交通职业技术学院,成都 611130

西南交通大学隧道工程教育部重点实验室,成都 610031

中铁建大桥工程局集团第三工程有限公司,沈阳 110043

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隧道工程 开挖面稳定性 预注浆加固 理论计算模型

国家自然科学基金国家自然科学基金中央高校基本科研业务费-科技创新项目中国国家铁路集团有限公司系统性重大项目中国国家铁路集团有限公司系统性重大项目成都市科技计划项目重庆市建设科技项目

52208404523784112682024CX020P2018G048K2023G0412022-XT00-00002-GX城科字2020第3-13

2024

10.13807/j.cnki.mtt.2024.05.005

现代隧道技术
中铁西南科学研究院有限公司 中国土木工程学会隧道及地下工程分会

现代隧道技术

CSTPCD北大核心
影响因子：1.493
ISSN：1009-6582
年,卷(期)：2024.61(5)