穿越富水破碎带隧道开挖变形监测及控制研究

Research on Deformation Monitoring and Control of Tunnel Excavation Through Water-Rich Fracture Zone

隧道施工有时需要穿越破碎带,特别是当破碎带较宽较陡又含丰富的地下水时,成为一项极大的技术挑战,开挖后可能产生较大的变形,威胁围岩稳定性及作业人员安全。针对某公路隧道穿越富水破碎带的工程实际,利用Abaqus软件采用数值模拟方法,构建了隧道与富水破碎带的三维模型,模拟了注浆前后围岩的变形行为,包括拱顶沉降、拱底隆起及拱腰水平位移等。为了验证注浆对围岩变形控制的有效性,通过现场监测数据与数值模拟结果进行了对比。结果表明,注浆处理显著减少了围岩的水平和竖向位移,使围岩变形更加缓和,有效提升了围岩的稳定性。

In tunnel construction,it is sometimes necessary to cross the fracture zone,especially when the fracture zone is wide and steep and contains abundant ground water,which becomes a great technical challenge.After excavation,large deformation may occur,threatening the stability of surrounding rock and the safety of workers.Aiming at the engineering practice of a highway tunnel crossing the water-rich fracture zone,a three-dimensional model of the tunnel and the water-rich fracture zone was constructed by using abaqus software and numerical simulation method.The deformation behavior of the surrounding rock before and after grouting was simulated,including the settlement of the vault,the uplift of the arch bottom and the horizontal displacement of the arch waist.In order to verify the effectiveness of grouting on the deformation control of surrounding rock,the field monitoring data and numerical simulation results were compared.The results show that the grouting treatment significantly reduces the horizontal and vertical displacements of the surrounding rock,makes the deformation of the surrounding rock more moderate,and effectively improves the stability of the surrounding rock.