玻璃纤维锚杆注浆加固掌子面效果研究

通过abaqus有限元方法模拟长江中下游地层和地质条件下破碎围岩浅埋隧道开挖过程,对加筋玻璃纤维锚杆注浆技术加固掌子面前后分别建立模型并进行对比分析强化结果,研究表明:玻璃纤维锚杆注浆加固能较大程度提高掌子面前方核心岩土体的黏聚力c、内摩擦角φ、弹性模量E和抗剪强度τ,加固后地表沉降减少了约20%,拱顶沉降量减少20%,掌子面纵向位移约30%,水平收敛减小10%,有效提高长江中下游地层和地质条件下破碎围岩浅埋隧道掌子面及其周围围岩的稳定性。

Research on Strengthening Effect of Grouting Glass Fiber Bolts for Tunnel Face

Here,by using abaqus finite element method to simulate a broken shallow-buried tunnel’s excavation process in the geological conditions of the middle and lower area of Yangtze River,the models are set up to research the strengthening results respectively.The research results show that the grouting glass fiber bolt consolidation method could largely improve the tunnel face’s core body in the cohesion force c,internal friction angle φ,elastic modulus E and shear strength τ after strengthening, the ground surface settlement reduces by about 20%,the vault settlement reduces by 20%,the longitudinal displacement reduces by about 30%,and the horizontal convergence reduces by 10%,all these as mentioned above could effectively improve the stability of surrounding rocks of the shallow broken tunnel face in the geological conditions of the middle and lower area of Yangtze River.