软弱围岩隧道短台阶法开挖数值模拟与监测分析

摘要

Taking the construction practice of Huazi tunnel of Yanru highway as an example,the article uses finite element model to perform monitoring analysis on the change of stress and position during the excavation of tunnel V grade surrounding rock by using short step method.The test result shows that this method has a good construction performance;the stress of surrounding rock,arch top settlement and deformation are all under the controllable range.%文章依托炎汝高速公路花子坳隧道施工实例,利用有限元模型对隧道Ⅴ级围岩深埋段短台阶法动态开挖过程的应力及位移变化情况进行了数值模拟分析。实测结果表明：短台阶法施工效果良好,围岩压力及拱顶下沉、周边收敛变形均在可控范围内。