首页|收敛约束法在挤压性围岩隧道中的应用

收敛约束法在挤压性围岩隧道中的应用

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由于挤压性围岩隧道围岩性质与应力环境的特殊性,其围岩特征曲线与常规隧道有明显差异.为研究挤压性围岩隧道围岩-支护相互作用关系,考虑支护效应修正围岩特征曲线,研究不同变形等级对修正围岩特征曲线的影响规律,优化挤压性围岩双线铁路隧道初期支护.研究结果表明,毛洞状态下,受双线隧道断面应力集中影响,拱脚和墙脚为安全控制位置;随着变形等级和侧压力系数增加,支护特征曲线与修正围岩特征曲线不再相交;Ⅰ、Ⅱ级变形采用单层支护可满足安全要求,锚杆只需布置在拱部和边墙位置,Ⅱ级及以上变形锚杆需要全环布置;Ⅳ级变形在采用双层支护的同时,需考虑改善洞室形状、超前加固等措施.
Application of Convergence-confinement Method in Squeezing Surrounding Rock Tunnel
Due to the particularity of surrounding rock properties and stress environment of squee-zing surrounding rock tunnel,the characteristic curve of surrounding rock is obviously different from that of conventional tunnel.In order to study the interaction relationship between surrounding rock and support in squeezing surrounding rock tunnel,the characteristic curve of surrounding rock was modified by considering the support effect.The influence of different deformation grades on the modified charac-teristic curve of surrounding rock was studied,and the primary support of double-track railway tunnel with squeezing surrounding rock was optimized.The results show that the arch foot and the wall foot are safe control positions due to the influence of stress concentration under the condition of a rough tun-nel.With the increase of deformation grade and lateral pressure coefficient,the support characteristic curve and the modified surrounding rock characteristic curve no longer intersect.The deformation of grade Ⅰ and grade Ⅱ can meet the safety requirements by using single-layer support.The anchors only need to be arranged in the arch and side wall positions,and the deformation anchors of grade Ⅱ and above need to be arranged in the whole ring.Grade Ⅳ deformation needs to consider measures such as improving the shape of the tunnel and advanced reinforcement while adopting double-layer support.

squeezing surrounding rock tunneldeformation gradestress release methodmodified surrounding rock characteristic curvesupporting characteristic curve

刘志春、柳平洋、陶正委、孙明磊、郭小龙

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石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄 050043

石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄 050043

石家庄铁道大学土木工程学院,河北石家庄 050043

挤压性围岩隧道 变形等级 应力释放法 修正围岩特征曲线 支护特征曲线

中国国家铁路集团有限公司科技研发计划中国铁建股份有限公司科技重大专项河北省自然科学基金

N2020G0402019-A04E2021210091

2024

10.13319/j.cnki.sjztddxxbzrb.20240004

石家庄铁道大学学报(自然科学版)
石家庄铁道大学

石家庄铁道大学学报(自然科学版)

CSTPCD
影响因子：0.757
ISSN：2095-0373
年,卷(期)：2024.37(2)
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