【摘要】 为研究软弱破碎围岩隧道洞口段大变形的治理方法,以临吉高速公路松卜岭隧道洞口段为工程背景,采用弹塑性有限元方法对隧道洞口段处置方案进行数值模拟,结合现场实测监控数据,对处治结果进行分析评价。结果表明:该隧道所处地层围岩软弱破碎稳定性差,加之地形浅埋偏压,导致进洞施工下沉量过大。临时仰拱和设置双液注浆小导管共同作用连接纵向钢拱架,可有效改善围岩变形提高支护能力,防止坍塌事故发生,并为同类相似工程提供参考。更多还原

【Abstract】 In order to study the treatment method for the large deformation of weak and broken rock tunnel entrance,on the basis of the Bu Song Ling tunnel of the Lin Ji highway project,a finite element numerical simulation was applied to the construction treatment about tunnel settlement.Finding out the reason of heavy settlement and combining with the actual monitoring data,the simulation results was analyzed and appraised.The results show that shallow tunnel bias,poor mechanical properties of rock and landslides lead to heavy settlement.Using an aid with dual fluid catheter and reinforced steel arch frame can improve support ability effectively and prevent collapsing.This method can also provide references for future similar projects.更多还原