摘要
基于护盾式隧道掘进机(tunnel boring machine,简称TBM)法隧道施工过程中围岩-盾体-注浆体-管片相互作用的机制,采用考虑围岩-盾体相互作用的围岩纵向变形曲线,结合Drucker-Prager屈服模型,提出了考虑围岩-盾体-注浆体-管片相互作用的深埋护盾式TBM法隧道围岩压力计算方法,并与围岩压力相关现场实测数据和其他围岩压力公式计算结果进行了对比。研究表明,护盾式TBM法隧道围岩压力主要表现为形变压力,考虑围岩-盾体-注浆体-管片相互作用的形变压力公式计算得到的围岩压力值相较于其他基于松散压力的计算公式跟现场实测数据更为吻合。围岩压力受围岩性质、隧道埋深、刀盘扩挖、盾体长度、注浆时机等因素的影响。隧道围岩压力随围岩黏聚力的增大呈先增大后减小的趋势,随围岩内摩擦角的增大呈先增大后减小的趋势,随围岩弹性模量的增大呈减小的趋势。围岩压力随隧道埋深的增大而增大。围岩压力随刀盘扩挖量的增大而减小,随盾体长度的增大而减小,随注浆滞后盾尾长度的增大而减小。当围岩与注浆体、管片相互作用时,围岩释放的初始位移越大,结构承受的围岩压力越小。提出的围岩压力计算方法对于深埋TBM法隧道结构设计具有一定的指导意义。
Based on the interaction mechanism among the surrounding rock-shield-grouting-lining segments during the construction of tunnels using the shield tunnel boring machine(TBM)method,utilizing a longitudinal deformation curve of the surrounding rock that accounts for the interaction with the shield-surrounding rock,in conjunction with the Drucker-Prager yield criterion,we propose a method for calculating the surrounding rock pressure in deep-buried tunnels constructed using the shield TBM method,considering the interactions among the surrounding rock-shield-grouting-lining segments.The proposed method is compared with field-measured data and results from other surrounding rock pressure calculation formulas.Research shows that the surrounding rock pressure in Shield TBM tunnels primarily manifests as deformation pressure.The calculated surrounding rock pressure values using the deformation pressure formula,which considers the interactions among the surrounding rock-shield-grouting-lining segments,show better agreement with field-measured data compared to other formulas based on loose pressure.The surrounding rock pressure is influenced by factors such as the properties of the surrounding rock,tunnel depth,cutter-head overcut,shield length,and grouting timing.The surrounding rock pressure initially increases and then decreases with the increase in rock cohesion.It shows a similar trend with the increase in the internal friction angle of the surrounding rock.The surrounding rock pressure decreases with the increase in the elastic modulus of the surrounding rock and increases with the increase in tunnel depth.It decreases as the cutter-head overcut increases,as the shield length increases,and as the delay in grouting behind the shield tail increases.When the surrounding rock interacts with the grouting and lining segments,a larger initial displacement released by the surrounding rock results in smaller surrounding rock pressure on the structure.The proposed surrounding rock pressure calculation method provides valuable guidance for the structural design of deep-buried TBM tunnels.
作者
冉龙洲
袁松
王希宝
张廷彪
刘德军
黎良仆
RAN Long-zhou;YUAN Song;WANG Xi-bao;ZHANG Ting-biao;LIU De-jun;LI Liang-pu(Sichuan Communication Surveying and Design Institute Co.,Ltd.,Chengdu,Sichuan 610017,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《岩土力学》
北大核心
2025年第S1期366-376,共11页
Rock and Soil Mechanics
基金
交通运输行业重点科技项目(No.2021-MS1-030)
四川省交通运输科技项目(No.2021-B-01)
