富水弱胶结砂岩隧道围岩注浆方案分析  

Analysis of Grouting Scheme for Surrounding Rock of Rich-Water Weakly Cemented Sandstone Tunnel

作　　者：侯宗政 HOU Zongzheng(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2025年第3期162-164,169,共4页Railway Construction Technology

基　　金：中铁北京工程局技术开发项目(ZLZQ-2-QT-2022-035)。

摘　　要：针对富水弱胶结砂岩隧道施工,以中兰铁路香山隧道工程为例,通过建立三维流固耦合施工计算模型,以围岩渗流场和位移场为评价指标,计算分析了半断面周边注浆、全断面周边注浆、半断面帷幕注浆三种注浆方案的加固效果。结果表明:对于弱胶结砂岩隧道施工,隧道开挖面会形成孔隙水压力为0的临空区域,进而形成漏斗状的渗流场;封闭掌子面的全周边注浆方案能显著降低衬砌孔隙水压力,减少地下水涌出风险;半周边注浆方案下的围岩变形控制效果较差,全周边注浆和半帷幕注浆方案变形能够有效控制围岩变形,相比半周边注浆方案的围岩变形平均降低20%以上。针对富水弱胶结砂岩地层隧道施工,半帷幕注浆方案在保证工期的同时,控制围岩的竖向变形和水平收敛,可有效提升围岩稳定性,保障施工安全。In response to the challenges of constructing tunnels in water-rich weakly cemented sandstone,this paper takes the Xiangshan Tunnel project of the Zhongwei-Lanzhou High-speed Railway as a case study.By establishing a three-dimensional fluid-solid coupling construction calculation model,the reinforcement effects of three grouting schemessemi-section peripheral grouting,full-section peripheral grouting,and semi-section curtain grouting were analyzed using the seepage field and displacement field of the surounding rock as evaluation indicators.The results indicate that during the construction of weakly cemented sandstone tunnels,an excavation face with zero pore water pressure forms,leading to a funnel-shaped seepage field.The full-section peripheral grouting scheme significantly reduced the pore water pressure in the lining and mitigated the risk of groundwater inflow.The perimeter rock deformation control effect under the semi-section peripheral grouting scheme is poor,and the deformation of the full-section peripheral grouting and semi-section curtain grouting schemes can effectively control the deformation of the perimeter rock,compared with the semi-section peripheral grouting scheme of the perimeter rock deformation is reduced by more than 20%on average.For the tunnel construction in water-rich weakly cemented sandstone stratum,the semisection curtain grouting scheme can effectively improve the stability of the surrounding rock and ensure the construction safety by controlling the vertical deformation and horizontal convergence of the surrounding rock while ensuring the construction period.

关 键 词：弱胶结 砂岩 稳定性 渗流场 位移场 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]