高地应力断层破碎带富水段隧道帷幕注浆效果及注浆圈参数研究  

Study on Curtain Grouting Effect and Grouting Ring Parameters for Water-rich Tunnels under High Ground Stress Fault Fracture Zone

作　　者：胡浩然 廖峻[1] 胡青平 王坤 HU Haoran;LIAO Jun;HU Qingping;WANG Kun(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2024年第3期141-150,共10页Technology of Highway and Transport

摘　　要：周边超前预注浆加固是改变裂隙岩体物理力学性能和渗透性能的有效方法,以鸡心岭隧道工程为例,通过数值模拟分析了周边预注浆加固前后、不同注浆圈厚度和注浆圈渗透系数对围岩渗流场、位移场、塑性区及支护受力的影响规律。结果表明:1)周边超前预注浆加固能有效降低初期支护静水压力,减小围岩塑性破坏范围和洞周位移,并使得隧道涌水集中发生在拱脚位置;2)注浆圈厚度超过8 m后,继续增大注浆圈厚度对围岩位移的影响较小;3)降低注浆圈渗透系数可有效降低隧道涌水量,但会增大围岩变形。Perimeter pre-grouting reinforcement is an effective method to change the physical and mechanical properties and permeability properties of fractured rock mass.In this paper,Jixinling tunnel is taken as an example,the influence of pre-grouting reinforcement before and after the full-section pre-grouting reinforcement,different thicknesses of grouting circle and permeability coefficients of grouting circle on the peripheral rock seepage field,displacement field,plastic zone and the support stress are analyzed by numerical simulation.The results show that:1)the full-section pre-grouting reinforcement can effectively reduce the hydrostatic pressure of the initial support,reduce the scope of peripheral rock plastic damage and peripheral displacement,and make the tunnel water influx concentrated in the foot of the tunnel;2)After the thickness of the grouting ring exceeds 8m,the influence of increasing the thickness of the grouting ring on the peripheral displacement of the surrounding rock is relatively small;3)Reducing the permeability coefficient of the grouting ring can effectively reduce the water influx in the tunnel,but it will increase the deformation of the surrounding rock.

关 键 词：高地应力 富水隧道 流固耦合 注浆参数 渗流场 

分 类 号：U457[建筑科学—桥梁与隧道工程]